Differential Pressure Monitor Owner’s Manual 125-2134 Rev.
Rev. DA, October 2006 NOTICE The information contained within this document is subject to change without notice and should not be construed as a commitment by Siemens Building Technologies, Inc. Siemens Building Technologies, Inc. assumes no responsibility for any errors that may appear in this document. All software described in this document is furnished under a license and may be used or copied only in accordance with the terms of such license.
Differential Pressure Monitor Owner’s Manual Table of Contents How To Use This Manual..............................................................................................IV Manual Organization..................................................................................................IV Manual Conventions ..................................................................................................V Manual Symbols ...........................................................................
Table of Contents Normal LED ...............................................................................................................12 Horn ...........................................................................................................................12 Loop Signal (4-20 mA)...............................................................................................12 Point Database .......................................................................................................
Differential Pressure Monitor Owner’s Manual ERROR STATUS Messages .........................................................................................34 Clearing an Error Condition.........................................................................................34 Glossary.........................................................................................................................35 Index ...............................................................................................
How To Use This Manual This manual is written for the owner and user of the Siemens Building Technologies, Inc. Differential Pressure Monitor (DPM). This manual is designed to help you become familiar with the monitor and its applications. This chapter covers manual organization, manual conventions and symbols used in the manual, and how to access help.
How To Use This Manual Manual Conventions The following table lists conventions to help you use this manual in a quick and efficient manner. Convention Example Numbered Lists (1,2,3…) indicate a procedure with sequential steps. Actions that you should perform are specified in boldface font. 1. Turn OFF power to the field panel. 2. Turn ON power to the field panel. 3. Contact your local Siemens Building Technologies representative. Type F for Field panels.
Differential Pressure Monitor Owner’s Manual Getting Help For more information about the Differential Pressure Monitor, contact your local Siemens Building Technologies representative. Where To Send Comments Your feedback is important to us. If you have comments about this manual, please submit them to SBT_technical.editor.us.sbt@siemens.
1 Product Overview Introduction Differential Pressure Monitor The Differential Pressure Monitor (DPM) is a Siemens Building Technologies FLN product. The DPM monitors the differential pressure between a room and an adjacent space, and provides visual and audible alarms to alert a user of alarm conditions (Figure 1).
Differential Pressure Monitor Owner’s Manual Ordering Notes Differential Pressure Monitor with Keyed Switch for negative pressurization. 547-005 Differential Pressure Monitor with Keyed Switch for positive pressurization. 547-006 Differential Pressure Monitor without Keyed Switch. 547-002 Related Equipment Remote Pressure Transmitter for use with the Differential Pressure Monitor. 547-003 Calibration tool for Remote Pressure Transmitter.
Chapter 1 – Hardware Components The components of the DPM include: • Liquid Crystal Display (LCD) • Light Emitting Diodes (LEDs) (2) • Horn Silence Button • Portable Operator’s Terminal Port • Pressure Mode Key Switch (optional) LCD Messages The LCD shows the differential pressure of the room in inches of H2O or Pascals. It also shows the status of the DPM with the following messages: LCD Message… Indicates that the… LOW PRESSURE room differential pressure is below the userdefined limit.
Differential Pressure Monitor Owner’s Manual LED Status The LEDs indicate the following status: Indicates that the DPM is operating in… LED color… Green a normal condition. Red an alarm condition. Button Functions The Horn Silence button on the DPM has the following functions: Button Horn Silence Functions • Pressing this button turns the alarm horn OFF (applies to all applications). • For Applications 702 and 704 only.
Chapter 1 – Hardware AIRFLOW TUBE SEN0179R2 OUTSIDE COVER PLATE INSIDE COVER PLATE Figure 2. Remote Pressure Transmitter Circuit Board The printed circuit board of the RPT (Figure 3) is the pressure signal generating area. The circuit board is not visible once the RPT is installed. The following components are hidden once the RPT is installed: • 24 Vac (wire receptacle) • Pressure signal (wire receptacle) Siemens Building Technologies, Inc.
Differential Pressure Monitor Owner’s Manual PIN #1 + - 24V TRUNK 1 2 3 + - SEN0177R1 TO DPM PRESSURE SIGNAL PIN #1 Figure 3. RPT Circuit Board. Operating and Power Specifications Operating temperature 65° to 85°F (18.3° to 29.5°C) Operating range 24 Vac, 50/60 Hz Power consumption 1.4 VA, Class 2, at 24 Vac Pressure Signal Output Definition and Specification The pressure signal output is a digital pulse signal that represents the measured pressure difference across the sensor.
2 Applications Basic Operation The DPM provides technology for monitoring differential pressure between a room and an adjacent space (anteroom). The DPM displays the pressurization mode, the differential pressure (optional) and all alarms, and the differential pressure of the anteroom. Each of the alarms is annunciated by a horn. Application 701 and 702 help healthcare facilities meet the Center for Disease Control’s recommendations for hospital isolation rooms.
Differential Pressure Monitor Owner’s Manual No Isolation – The DPM expects to detect no air entering or leaving the patient room. This is achieved by exhausting the same amount of air that is being supplied to the room. The DPM monitors the differential pressure, measured by the RPT, but does not compare it to the user defined pressure limits. While in No Isolation, the DPM does not alarm.
Chapter 2 – Applications Protective Isolation/Positive Pressurization Mode – Application 701 and 702 NOTE: It is normal for the room pressure reading to briefly go beyond the alarm limits and then return to the desired range. This condition is caused by: • Opening the door • Walking past the sensor • Changing airflow supplied to or exhausted from the room Set the alarm delay long enough that these normal occurrences do not cause false alarms.
Differential Pressure Monitor Owner’s Manual Anteroom If the differential pressure rises above the high limit and remains so longer than the time set in the alarm delay, the high pressure alarm will turn on and the DPM’s LCD displays HIGH PRESSURE and ANTEROOM. The alarm clears when the differential pressure falls below the high limit and the DPM’s LCD no longer displays HIGH PRESSURE and ANTEROOM. Door Alarm When the door is open the DPM’s LCD displays DOOR OPEN.
Chapter 2 – Applications Analog Pressure Output – The DPM generates a linear signal that corresponds to the measured (actual) space pressure over the range of −0.2 to +0.2 in. of H2O (−49.8 to +49.8 Pa) (Table 1). If the measured pressure is outside this range, the output signal remains at its minimum or maximum level depending on the direction of the airflow. Table 1. Analog Output Signal Level Differential Pressure (in. of H2O (Pa)) Analog Output (mA) −0.2 (−49.8) 4 0.0 (0.0) 12 +0.2 (+49.
Differential Pressure Monitor Owner’s Manual Door Input In Slave Mode, the Door Input that monitors the door position can be used by the field panel. The following table is an example of the input: When… Then… There is a short circuit across the input DOOR POSN (Point 32) changes from CLOSED to OPEN. There is an open circuit across the input DOOR POSN (Point 32) changes from OPEN to CLOSED. Alarm LED Alarm, will normally be OFF. If desired, this point can be turned on or off from the field panel.
3 Point Database Overview Chapter 3 presents a description of the Differential Pressure Monitor (DPM) point database including point descriptors, point addresses, and a listing of applications in which each point is found. Descriptor Address Application CTLR ADDRESS 01 701, 702, 703, 704, 790 Identifies the DPM on the Siemens Building Technologies FLN trunk. Valid entries: 0-31, 99. APPLICATION 02 701, 702, 703, 704, 790 Identification number of the program operating in the DPM.
Differential Pressure Monitor Owner’s Manual Descriptor Address Application HI PRES ALM 15 701, 702, 703, 704 Indicates that a high pressure alarm is active. DP1 FAIL 16 701, 702, 703, 704 Indicates the Remote Pressure Transmitter for the occupied room has failed. DP2 FAIL 17 702, 704 Indicates the Remote Pressure Transmitter for the anteroom has failed. DOOR ALARM 18 701, 702, 703, 704 Indicates if the door alarm is active.
Chapter 3 – Point Database Descriptor Address Application Description CAL DP2 AVG 41 702, 704 Represents the average value of DP2 RAW (Point 88) for the period of time set in CAL TIME (Point 44). DP2 RAW is sampled for averaging when CAL DP2 (Point 43) is set to DONE. When CAL TIME has elapsed, the average value of DP2 RAW for this time period will be displayed in this field. CAL DP1 42 701, 702, 703, 704 The operator sets this point to DONE to initiate the field calibration procedure.
Differential Pressure Monitor Owner’s Manual Descriptor Address Application Description MID1 NEG 56 701, 702, 703, 704 Represents the field calibration differential pressure, as read from DP1 RAW (Point 68), when the Remote Pressure Transmitter calibrator is set to the MIDdle differential pressure (-0.050 in. of water, -12.45 Pascals) for negative pressurization.
Chapter 3 – Point Database Descriptor Address Application DP2 RAW 88 702, 704 Indicates RAW counts used for diagnostic purposes. SWITCHOVER 89 701, 702, 703, 704 Indicates that the controller is switching from one pressure mode to another. This point will turn OFF when SWITCH DELAY has timed out. DISPLAY DP1 90 701, 702, 703, 704 When this point is set to ON, the differential pressure reading from DIFF PRES1 (Point 30) is displayed on the LCD.
Differential Pressure Monitor Owner’s Manual 18 Siemens Building Technologies, Inc.
4 Troubleshooting This chapter describes corrective measures you can take should you encounter a problem when using a Differential Pressure Monitor (DPM). You are not required to do any monitor troubleshooting. You may wish to contact your local Siemens Building Technologies representative if a problem occurs or if you have any questions about the DPM. NOTE: When troubleshooting, record what the problem is and what actions were performed immediately before the problem occurred.
Differential Pressure Monitor Owner’s Manual Safety Features The circuit board stores the DPM’s address, applications, and selected point values. In the event of a power failure or a reset, these values are retrieved from the DPM’s permanent memory and are used by the DPM unless overridden by a field panel.
Chapter 4 – Troubleshooting External Alarm Output Check To check if the External Alarm Output is functioning properly, follow these steps. Equipment Required • Multimeter (digital or analog) • Portable Operator’s Terminal (POT) and cable. 1. Connect the POT to the monitor’s communication port. If you are unable to establish communication with the monitor, contact your local Siemens Building Technologies representative. 2. Turn the meter on and set it to monitor resistance (ohms, Ω). 3.
Differential Pressure Monitor Owner’s Manual Procedure if RELAY MODE is set to NOPEN. 1. Set RELAY MODE to NOPEN. 2. Connect the meter to pins 1 and 2 (Figure 5). 3. Set ALARM STATUS to NORMAL. • ALARM OUT should display OFF and the meter should indicate an open circuit. • If either ALARM OUT or the meter does not indicate a change in value, contact your local Siemens Building Technologies representative. 4. Set ALARM STATUS to ALARM.
Chapter 4 – Troubleshooting Door Switch Input Check To check if the Door Switch Input is functioning properly, follow these steps. Equipment Required • Jumper wire (use a 3-inch (76 mm) piece of wire, stripped at both ends, or equivalent). • Portable Operator’s Terminal (POT) and cable. 1. Plug the POT into the communication port on the monitor. 2. Select the Start-up report from the Reports Menu. SEN0205R1 3.
Differential Pressure Monitor Owner’s Manual Procedure if DOOR SW MODE is set to NOPEN. 1. Verify that DOOR SWITCH = YES. 2. Verify that DOOR SW MODE = NOPEN. 3. Connect the jumper wire between monitor screw terminals 3 and 4 for the DOOR POSN (Point 32). See Figure 4-1 for location of the screw terminals. • Verify that DOOR POSN is OPEN, indicating a contact closure. 4. Remove the jumper wire from one of the terminals. • Verify that DOOR POSN is CLOSED. 5.
Chapter 4 – Troubleshooting CV Controller Pressure Mode Output Check To check if the CV Controller Pressure Mode Output is functioning properly, follow these steps. Equipment required • Multimeter (digital or analog) • Portable Operator’s Terminal (POT) and cable. DPM without a Pressure Mode Key Switch 1. Connect the POT to the monitor’s communication port. If you are unable to establish communication with the monitor, contact your local Siemens Building Technologies representative. 2.
Differential Pressure Monitor Owner’s Manual Procedure if DO MODE is set to NCLOSE. 1. Set ACTIVE.NTRAL to NTRAL, POS.NEG to POS, and DO MODE to NCLOSE. 2. Connect the meter to pins 9 and 10. See Figure 7. • The meter should indicate a short circuit. If the meter does not change in value, contact your local Siemens Building Technologies representative. 3. Set ACTIVE.NTRAL to ACTIVE. • The meter should indicate an open circuit.
Chapter 4 – Troubleshooting Procedure if DO MODE is set to NCLOSE. 1. Release the points POS.NEG and ACTIVE.NTRAL 2. Set DO MODE to NCLOSE. 3. Connect the meter to pins 9 and 10. See Figure 7. 4. Turn the key to the Infectious Isolation/Negative Pressure position. • The meter should indicate a closed circuit. If the meter does not change in value, contact your local Siemens Building Technologies representative. 5. Turn the key to the Protective Isolation/Positive Pressure position.
Differential Pressure Monitor Owner’s Manual RPC Pressure Mode Output Check Equipment required • Multimeter (digital or analog) • Portable Operator’s Terminal (POT) and cable with the Controller Interface Software loaded and running. 1. Connect the POT to the monitor’s communication port. If you are unable to establish communication with the monitor, contact your local Siemens Building Technologies representative. 2. Select the Start Up report from the Reports Menu. 3.
SEN0208R1 Chapter 4 – Troubleshooting - PIN# 1 2 3 4 + 5 6 - + + - 7 8 9 10 11 12 13 14 RPC Pressure Mode Figure 8. RPC Pressure Mode Point. Siemens Building Technologies, Inc.
Differential Pressure Monitor Owner’s Manual 4-20 mA Signal Output Check To check if the 4-20 mA Signal Output is functioning properly, follow these steps. Equipment Required • Multimeter (digital or analog) • 500 Ω Resistor • Portable Operator’s Terminal (POT) and cable. Procedure 1. Connect the POT to the monitor’s communication port. If you are unable to establish communication with the monitor, contact your local Siemens Building Technologies representative. 2.
SEN0209R1 Chapter 4 – Troubleshooting - PIN# 1 2 3 4 + 5 6 - + + - 7 8 9 10 11 12 13 14 500 Ω 4-20 mA Signal Figure 9. 4-20 mA Signal Output Point. Troubleshooting Find the symptom that best describes the problem. Perform the corrective action that follows. If the problem persists, contact your local Siemens Building Technologies representative. A. DP1 FAIL (Point 16) reads ON at the POT and GENERAL displayed on the LCD.
Differential Pressure Monitor Owner’s Manual C. The pressure in the room is positive (negative) with respect to the adjacent space (corridor or anteroom), but DIFF PRES1 (Point 30) indicates a negative (positive) value. 1. Check that the sensor is not exposed to any drafts that may bias the sensor reading. Contact your local Siemens Building Technologies representative if sensor relocation is necessary. 2. Toggle SIG1 PHASE (Point 67) from LO to HI (or from HI to LO) depending on its current setting. 3.
Chapter 4 – Troubleshooting G. The value of DOOR POSN (Point 32) does not change value when the door position changes. 1. Verify that DOOR SWITCH (Point 28) is set to YES. 2. Check the wiring to the door contact switch and to the monitor. 3. Check continuity of the door contact switch when door is open and closed. 4. Check continuity of the wires between the door contact switch and the monitor. 5. Contact your local Siemens Building Technologies representative. H.
Differential Pressure Monitor Owner’s Manual ERROR STATUS Messages Each application contains a point called ERROR STATUS, which appears as point 99 on the Portable Operator’s Terminal (POT) display. ERROR STATUS gives a numerical indication of any errors detected during power up of the monitor. Error Status codes are listed in Table 2. Table 2. ERROR STATUS Descriptions. ERROR STATUS Description 0 Everything is operating properly.
Glossary The glossary contains terms and acronyms that are used in this manual. For definitions of point database descriptors, see Chapter 3 - Point Database in this manual. For definitions of commonly used terms, as well as acronyms and abbreviations associated with the APOGEE Automation System, see the Siemens Building Technologies Technical Glossary of Building Controls Terminology and Acronyms, (125-2185). This book is available from your local Siemens Building Technologies representative.
Differential Pressure Monitor Owner’s Manual Datamate Base Software Operator interface software used with the Portable Operator’s Terminal for the purpose of communicating with the Differential Pressure Monitor, a Terminal Equipment Controller, or a field panel. DDC Direct Digital Control. DI Digital Input. Physical point that accepts a two-state signal, such as, ON/OFF, OPEN/CLOSED, or YES/NO, etc. DO Digital Output.
Glossary Inches of H2O Measure of pressure using English units. infectious isolation Term used in Healthcare facilities to identify an isolation room that is negatively pressurized to prevent any contagious airborne pathogens from leaving the room. For example, this type of isolation is used with patients that have Tuberculosis (TB). intercept Factor that converts analog values (used by the Differential Pressure Monitor) to a form that the user can understand (engineering units).
Differential Pressure Monitor Owner’s Manual no isolation Term used in Healthcare facilities to identify a patient isolation room that is not pressurized. Pascals Measure of pressure using SI units. physical points Points which the system uses to reference the actual, physical sensors and actuators connected to field input/output terminations.
Glossary slave mode Default application that comes up when the power is first applied to a new Differential Pressure Monitor. No monitoring is initiated in the Slave Mode. slope Factor that converts analog values (used by the Differential Pressure Monitor) to a form that the user can understand (engineering units). Slope and intercept constants are determined by the type and range of field input/output represented by the physical or virtual point.
Differential Pressure Monitor Owner’s Manual virtual points Points which the system uses to store information not connected to a physical device. 40 Siemens Building Technologies, Inc.
Index A alarm relay, digital output Single Sensor Operation ..........................2, 10 alarm sequence Dual Sensor Operation Laboratory Application ..............................10 analog inputs troubleshooting .............................................23 analog output 2-value resistive signal ...................................2 4-20 mA pressure signal ................................2 analog pressure digital output .................................................11 ANTEROOM .......................
ALARM .........................................................10 HORN ...........................................................12 NORMAL ......................................................10 LEDs status indications ............................................4 Light Emitting Diodes .......................... See LEDs Liquid Crystal Display............................ See LCD LOW PRESSURE ..........................................3, 9 M maintenance, preventive ..................................
