ENMET Corporation PO Box 979 Ann Arbor, MI 48106-0979 ENGUARD MX48 CONTROL Operation and Maintenance Manual Manual Part Number 80003-048 MCN-359, 06/15/07
Table of Contents 1.0 Introduction....................................................................................................................................................................1 1.1 Unpack.......................................................................................................................................................................1 1.2 Check Order .....................................................................................................................
MX48 CONTROL ENMET Corporation 1.0 Introduction The MX48 CONTROL can include from 1 to 8 independent channels. Each channel is connected to one or more 4-20 mA sensor/transmitters installed in the locations to be monitored. The output from each sensor/transmitter (S/T) is displayed on the MX48 CONTROL and compared with alarm thresholds. If thresholds are exceeded, the control actuates relays that can be used to control external devices.
ENMET Corporation MX48 CONTROL 2.0 Features 2.1 The wall-mounted enclosure The enclosure of the MX48 CONTROL is a wall-mounted box consisting of a case and a cover that can be pivoted up to access the interior. For overall dimensions see section 3 installation, Figure 2 exterior view. For over view of interior see Figure 1 interior view.
MX48 CONTROL ENMET Corporation 3.0 Installation 3.1 Installation Recommendations The MX48 CONTROL can be installed anywhere away from an explosive atmosphere. It should preferably be located in a ventilated area under surveillance such as a, guard post, control room, instrumentation room, etc. NOTE: To be able to fully open the hinged front cover of the MX48 CONTROL, allow space for opening by rotating the cover 90 degrees upwards see Figure 1.
ENMET Corporation MX48 CONTROL 3.2 Electrical Connection of the MX48 CONTROL To make electrical connections, turn off the control using the general ON/OFF switch located on the power supply board, see Figure 1a for location of ON/OFF switch. The MX48 CONTROL is equipped with an automatic switching circuit to connect to 24VDC power should the 110VAC power fail. Hence, it is possible to use inexpensive backup power supplies.
MX48 CONTROL ENMET Corporation Connector to Display Board Terminal to Transformer Power On/Off Switch Alarm Relay Filter Fault Relay 24 VDC Fuses Clear 1 Clear 2 GND 485-A 485-B 2A, AC Fuses –24VDC INPUT 110VAC +24VDC INPUT NC Fault relay Or Optional 210VAC if installed AL3, SYSTEM ALARM RELAY Fault relay AL3, SYSTEM ALARM RELAY Figure 3: Power Supply Board Connections 5
ENMET Corporation MX48 CONTROL WARNING: Each channel of the MX48 CONTROL has a terminal strip to which all wiring for that channel is connected. A typical four-channel circuit board is shown in Figure 3a and wiring for this terminal is shown in Table 3. 3.2.3 4-20 Sensor/Transmitter Sensor/Transmitters are connected to positions C1, C2 and C3 on each channel terminal strip. Connections are shown in Table 1 for two wire S/T and Table 2 for three wire S/T.
MX48 CONTROL ENMET Corporation Display POTs for Channel 1 or 5 see Caution Fuse Channel Terminal Typical Labeling 1 Display POTs for Channel 2 or 6 see Caution Fuse Fuse Fuse Display POTs for Channel 3 or 7 see Caution Fuse Fuse Channel 1 or 5 Channel 3 or 7 Channel 2 or 6 Channel 4 or 8 2 3 4 5 Channel Terminal Numbers used as reference in Table 3 6 7 Display POTs for Channel 4 or 8 see Caution Fuse Fuse 8 9 Figure 3a: Typical Channel Board See Figure 1 for location of Channel Board
ENMET Corporation MX48 CONTROL 4.0 Operation 4.1 Checking the Installation The electrical installation should conform to appropriate electrical codes, such as the National Electrical Code in the United States. WARNING: The compliance of the installation to appropriate codes is not ENMET’s responsibility. The MX48 CONTROL should be powered through circuit breakers provided for this purpose. 2.
MX48 CONTROL ENMET Corporation 4.3 Operating Modes 4.3.1 Buzzer: During normal operation, whenever there is a fault or an alarm, the buzzer is triggered. The buzzer is stopped by pressing the CLEAR button or by clearing remotely. The buzzer emits a continuous sound when an alarm threshold is exceeded. 4.3.2 Light-emitting Diodes (LED) Each channel has 5 LEDs that are visible and labeled on the FRONT panel. See Figure 4.
ENMET Corporation MX48 CONTROL 4.3.3 Alarm Thresholds Each of the 3 alarm thresholds can be programmed independently for each channel (see "Channel programming" menu). During normal operation a gas alarm is triggered only after a preprogrammed lag time, so as to avoid untimely alarms.
MX48 CONTROL ENMET Corporation 5.0 Programming Functions of Switches and Menus for Programming and Calibration 5.1 Front Panel Keypad The keypad is has four pressure switches (buttons) on the MX48 CONTROL FRONT panel. – – + + TEST / ENTER - Manual display of previous channel - Manual display of previous menu - Decrease value, threshold, etc. - Display of previous choice (on ← off, etc.) - NO - Combined with the “PLUS” switch to restart the channel’s automatic display cycle.
ENMET Corporation MX48 CONTROL 5.2 Maintenance Switches PROGRAMMING switch: accessible after opening and swiveling the front panel. Combined with the “–” switch to go back in a menu. To quit normal display mode and access the various menus (see block diagram of the various menus). To scroll through a menu. CALIBRATION switch: accessible after opening and swiveling the front panel. To set a channel to CALIBRATION mode. To quit that mode. See section 5.3.
MX48 CONTROL ENMET Corporation 5.3 Menus 5.3.1 Menus and their Functions The MX48 CONTROL has five menus that are accessed by pressing the “Programming” switch. These five menus are as follows: Table 6: Programming Functions DESIGNATION “CHANNEL” programming FUNCTION - To program the whole configuration of a channel (ON/OFF, range, alarm thresholds, etc...) “SIMULATION” programming - To artificially vary a channel measurement on: - the display panel, - the 4-20 mA current output.
ENMET Corporation MX48 CONTROL 5.3.2 Legend for Block Diagrams of Programming Menus It is easy to use these various menus by means of the switches on the keypad and the “Programming” switch Detailed flow diagrams of the menu scrolling function and of each menu are given in the following sections. P Programming switch + Switch used to move forward - Switch used to move in reverse ENTER ACQUIT Switch used to enter data This switch can also be used to exit from the current menu.
MX48 CONTROL ENMET Corporation 5.4 Bock Diagram of Scrolling Programming Menus NORMAL DISPLAY See section 4.3.4 P Programming [Channel xx] + To program the whole configuration of a channel (ON/OFF, range, alarm thresholds, etc...) See section 5.4.1 – Programming Simulation [Channel xx] + – Programming Copy [Channel xx] + To artificially vary a channel measurement on: - the display panel, - the 4-20 mA current output. To trigger the alarms (LED and relays) at the same time. See section 5.4.
ENMET Corporation MX48 CONTROL 5.4.1 Block Diagram of Channel Programming Menu Seuil Alarme 1 NORMAL [25] DISPLAY P Programming [Channel xx] : Last channel displayed P Channel xx [Off] : Off - On ← → + then ENTER P Measuring range [1..] : Choice of Ranges 10 30 100 300 1000 2000 xxxx U + → + → + → + → + → + then ENTER P Decimal point [1…] : Selection of Point Positioning 1. 10.0 1.00 .10 .010 .001 → → → → + ← + → ← + ← + ← + ← + then ENTER P Alarm 1 threshold [25] : . to 2 . . .
MX48 CONTROL Continued From Previous Page ENMET Corporation P Alarm 3 threshold [75] : . to 2 . . .
ENMET Corporation Continued From Previous Page Ack alarm 1 [Manual] MX48 CONTROL Manual - Automatic ← → + then ENTER P Ack alarm 2 [Manual] Manual - Automatic ← → + then ENTER then ENTER then ENTER then ENTER P Alarm 3 [Time Lag] Time Lag - Average ← → + P Relay safety 1 [Positive] Negative - Positive ← → + P Relay safety 2 [Positive] Negative - Positive ← → + P Relay 1 [Free] Free - P Continued On Next Page 18 ← → Set to Strength ← + → Set to Preset Relay +
MX48 CONTROL Continued From Previous Page ENMET Corporation Free Relay 2 [Free] - ← → Set to Strength Set to Preset Relay ← + + then → ENTER ← → Set to Strength Set to Preset Relay ← + + then → ENTER P Free Relay 3 [Free] - P Set to Free Fault relay [Free] - ← → + Set to 1 ← → + then ENTER P The MX48 CONTROL can detect and indicate (with a flashing yellow LED) that a line has-been placed in CALIBRATION mode on the detector.
ENMET Corporation Continued From Previous Page Units [LEL] MX48 CONTROL LEL - % ← → ← → + ppm etc. + then ENTER P Alarm time 1 [00:00:05] H : mn : sec Time: Time interval between the triggering of the AL LED and of the corresponding relay, or the minimum operating time of the relay in parking mode. ← + ENTER then → NOTE: Factory default setting is 5 seconds. P Alarm time 2 [00:00:05] Display of time by using switches ← + ENTER then → NOTE: Factory default setting is 5 seconds.
MX48 CONTROL ENMET Corporation 5.4.2 Block Diagram of Simulation Programming Menu NORMAL DISPLAY P + Programming [Simulation xx] ENTER Programming [Simulation xx] Simulation on previously displayed and [validated] channel P Free labeled area Channel xx LEL CH4 S S = flashing to indicate that this channel is in simulation mode.
ENMET Corporation MX48 CONTROL 5.4.
MX48 CONTROL ENMET Corporation 5.4.
ENMET Corporation MX48 CONTROL Continued From Previous Page Response time [00:00:05] H : mn : sec This is the time interval between exceeding of the AL threshold and triggering of the corresponding visual alarm (LED). Display the time using the switches - ← → + → then ENTER P Stop rL 1&2 [00:00:05] H : mn : sec P Relay safety [Negative] In “Parking” mode: this is the time interval between stopping of relay 1 and starting up of relay 2.
MX48 CONTROL ENMET Corporation 5.4.5 Block Diagram of Reprogramming Programming NORMAL DISPLAY P + + + + Programming Reprogramming ENTER Programming [Reprogramming] P Press ACQUIT to Escape Mode If computer is not connected Reprogramming Confirm Display of menu Validation of utilization of menu Display of menu confirmation Data transfer request Validation of data transfers ENTER ACQUIT MX48/52 V2.
ENMET Corporation MX48 CONTROL 6.0 WARRANTY ENMET warrants new instruments to be free from defects in workmanship and material under normal use for a period of one year from date of shipment from ENMET. The warranty covers both parts and labor excluding instrument calibration and expendable parts such as calibration gas, filters, batteries, etc... Equipment believed to be defective should be returned to ENMET within the warranty period (transportation prepaid) for inspection.
PO Box 979 680 Fairfield Court Ann Arbor, Michigan 48106-0979 734.761.1270 Fax 734.761.3220 Returning an Instrument for Repair ENMET instruments may be returned to the factory or any one of our Field Service Centers for regular repair service or calibration. The ENMET Repair Department and Field Service Centers also perform warranty service work.
Repair Return Form Mailing Address: ENMET Corporation PO Box 979 Ann Arbor, Michigan 48106 Phone Number: FAX Number: Shipping Address: ENMET Corporation Attn: Repair Department 680 Fairfield Court Ann Arbor, Michigan 48108 734.761.1270 734.761.
