Installation guide

ManualsBrandsBacharach ManualsNetwork CardLonWorks FT-10

3015‐5543

Revision0

/14/10

Installation Guide

Bacharach HGM-MZ to LonWorks FT-10

Communications Adapter

NOTE: User resource files are available for download on the Bacharach web site.

Introduction

The Bacharach HGM-MZ to LonWorks FT-10 Communications Adapter enables a Bacharach

HGM-MZ Refrigerant Monitor to communicate with a LonWorks FT-10 Free Topology network. Zone

PPM readings, flow status, refrigerant selections, and HGM-MZ internal health may be viewed over

LonWorks. In addition, each HGM-MZ zone supports three levels of alarming (leak, spill, and

evacuate) and each alarm threshold can be set over LonWorks.

Figure 1 – HGM-MZ-to-LonWorks FT-10 Communications Adapter

The LonWorks FT-10 Communications Adapter can be used in conjunction with the MZ-RD remote

display if desired. Wiring details and operational limitations when using the MZ-RD are discussed

below. For additional information on the Bacharach HGM-MZ, refer to document 3015-5074.

CAUTION:

The adapter is powered from the 120/240V universal power supply connection on the

HGM-MZ main board. 120/240V is present on the lower left corner of this adapter

within the area shown on the board silkscreen. Keep fingers away from this area when

the HGM-MZ is powered.

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Summary of content (13 pages)

PAGE 1
3015‐5543 Revision 0 12/14/10 Installation Guide Bacharach HGM-MZ to LonWorks FT-10 Communications Adapter NOTE: User resource files are available for download on the Bacharach web site. Introduction The Bacharach HGM-MZ to LonWorks FT-10 Communications Adapter enables a Bacharach HGM-MZ Refrigerant Monitor to communicate with a LonWorks FT-10 Free Topology network. Zone PPM readings, flow status, refrigerant selections, and HGM-MZ internal health may be viewed over LonWorks.
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3015‐5543 Revision 0 12/14/10 Adapter Installation inside the HGM-MZ The communications adapter board is typically installed in the HGM-MZ at the factory. however, be field installed by following the instructions below. Step 1. It can, Instruction The following installation materials are needed for field installation of the adapter. Five (5) 6-32 × ¼″ screws 2. The adapter board mounts on the rear of the HGM-MZ enclosure door.
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015‐5543 Revision 0 12/14/10 Step Instruction Figure 3 – Wiring with Remote Display (Option B) 6. In either case, be sure to set the HGM-MZ’s internal “terminator” slide switch next to the RS-485 terminal block to the “In” position. Setting the HGM-MZ Communications Address on the Adapter Board See Figure 4 for details of DIP switch A. Refer to Figure 1 for the location of DIP switch A.
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3015‐5543 Revision 0 12/14/10 Switches 5-8 on DIP switch A of the Adapter Board are used to match the node address set on the HGM-MZ’s address DIP switch (on the HGM-MZ main board). Values from 0-15 are possible, as shown in the table below.
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3015‐5543 Revision 0 12/14/10 Identifying the HGM-LonWorks Adapter on the Network The adapter can be identified on the network in three ways: 1. If the network management software supports identification by service PIN, the adapter’s service pushbutton (directly above the FT-10 twisted pair terminal block—see Figure 1) can be pushed when the network management software requests it. This causes a “here I am” message to be broadcast which should be received by the network manager. 2.
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3015‐5543 Revision 0 12/14/10 LonWorks Objects and Network Variables The adapter contains:  1 Node Object  16 Zone Objects (one Zone Object for each refrigerant sampling zone)  1 General Status Object  1 Alarm Control Object. Object #0 – The Node Object Network input variable nviRequest allows the user to request information from different objects in the node. The nviRequest contains an object ID field that specifies which object receives the request. The following request types are supported.
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3015‐5543 Revision 0 12/14/10 Setting nciMaxStsSendT to a very small value will cause unnecessary traffic on the LonWorks network. A value of less than 500 milliseconds will, in fact, be ignored. A suggested value for nciMaxStsSendT is in the range of 10-60 seconds. If timed, automatic status updates are not desired, set nciMaxStsSendT to zero. Then status updates will only be sent in response to nviRequest updates.
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3015‐5543 Revision 0 12/14/10 Object #17 – General Status Object The General Status Object provides information about any HGM-MZ internal faults present and shows which zone is currently being sampled. Network output variable nvoHgmFaultAlert reports whenever ANY fault is detected within the HGM-MZ or adapter. It is of type SNVT_switch. It is useful for binding to a fault lamp on a remote annunciation panel using a network input variable of type SNVT_switch.
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3015‐5543 Revision 0 12/14/10 Object #18 – Alarm Control Object The Alarm Control Object provides information about any alarms which are present in the HGM-MZ. It also provides mechanisms for acknowledging alarms, and for viewing and setting the leak, spill, and evacuate alarm thresholds for each zone. Network input variable nviHgmAlarmAck has a single parameter (unsigned short) that specifies which zone alarm the operator wishes to acknowledge.
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3015‐5543 Revision 0 12/14/10 Network output variable nvoHgmAlarmAlert reports whenever ANY gas concentration alarm (leak, spill, or evacuate) is generated by the HGM-MZ. It is of type SNVT_switch. It is useful for binding to an alarm lamp on a remote annunciation panel using a network input variable of type SNVT_switch. When there are no alarms, nvoAlarmAlert will have value=0, state=0. When there is any alarm, nvoAlarmAlert will have value=200, state=1.
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3015‐5543 Revision 0 12/14/10 # nv1 nviRequest SNVT_obj_request nc22 nciMaxStsSendT SCPTmaxSndT nv2 nvoStatus SNVT_obj_status nv1 nvoHgmZonePPM SNVT_ppm nv5 nvoHgmZoneStatus SNVT_str_asc nv1 nvoHgmFaultAlert SNVT_switch nv2 nvoHgmFaults SNVT_state nv3 nvoZoneSampling UNVT_zone_specifier nv1 nviHgmAlarmAck UNVT_zone_specificer nv4 nviHgmAlmAckSw SNVT_switch nv5 nviSetZoneThresh UNVT_zone_thresholds nv2 nv6 nv7 nv8 nv9 nviGetZoneThresh nvoHgmAlarmAlert nvoHgmLeakAlert nvoHgmS
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3015‐5543 Revision 0 12/14/10 Operating Limitations When Using MZ-RD Remote Display When an MZ-RD remote display is used, the FT-10 network will have access to the HGM-MZ as long as the MZ-RD is in either the SYSTEM or ZONE VIEW screen. If the MZ-RD is set to display any other screen, it will respond to polls from the FT-10 adapter with an HGM BUSY exception code. The LonWorks adapter will handle the exception by marking most points as “Unavailable” and setting the Unavailable Reason point to “HGM Busy”.
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3015‐5543 Revision 0 12/14/10 NOTE: The LEDs are driven by adapter software states, not by the RS-485 hardware. If an RS-485 connection stops working in the middle of receiving a message, the RX LED may stay on indefinitely until the connection starts working again. Troubleshooting If the adapter seems not to be functioning correctly, it can be restarted without restarting the HGM-MZ simply by pressing the CPU RST button just below the “A” DIP switch.