Bacharach FT-10 User Manual

3015-4568
Revision 0

9/11/03

Installation Guide

Bacharach HGM300 to LonWorks FT-10

Communications Adapter

Introduction

The Bacharach HGM300 to LonWorks Communications Adapter enables an HGM300
Refrigerant Monitor to communicate with a LonWorks FT-10 Free Topology network.
Zone PPM readings, flow status, refrigerant selections, and HGM internal health may be
viewed over LonWorks. Each HGM zone supports three levels of alarming (Leak, Spill,
Evacuate) and each alarm threshold can be set over LonWorks.

The LonWorks Communications Adapter can be used in conjunction with the RDM800
remote display if desired. Wiring details and operation limitations when using the
RDM800 will be discussed later in this document.

Caution

The adapter is powered from the 120V Auxiliary Power connection on the HGM power
supply board. When the HGM is powered up, 120V is present on the lower left corner of
the adapter within the area shown on the board silkscreen. Keep fingers away from this
area when the HGM is powered!!

Adapter Installation Inside HGM300

The communications adapter board will normally be installed in the HGM300 at the
factory. It can, however, be field installed by following the instructions below.

The following installation materials are needed for field installation of the adapter:

(5) 6-32 x ¼” screws (standard finish)
(5) 6-32 x ½” threaded standoffs
(5) 6-32 x ¼” decorative black anodized screws (standard finish OK, black looks nicer)

The adapter board mounts on the rear of the HGM300 door. Position the adapter board
so as not to interfere with the HGM internal components when the door is shut. Mark
(Figure 1) and drill the board’s four corner holes and center hole in the door. Install the
five standoffs on the rear side of the door using the five black decorative screws on the

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front side of the door. Position the adapter board over the standoffs mounted on the
HGM door. Install the five remaining 6-32 screws through the board and into the
standoffs and tighten.

Connect power wiring from the HGM300’s 120V Auxiliary Power terminal block to the
adapter board’s POWER terminal block. Use UL approved wire. Wire polarity does not
matter.

If an RDM800 remote display is NOT used with the adapter, refer to Figure 2 for wiring
details. In this case, all wiring between the HGM300 main board and adapter is
contained within the HGM300 and the only external cable is the LonWorks FT-10
communications cable.

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If an RDM800 remote display IS to be used with the adapter, refer to Figure 3 for wiring
details. Note that when the RDM800 is used, TWO RS-485 cables must be run between
the HGM300 and RDM800, so plan accordingly.

In either case, be sure to set the HGM300’s internal “Terminator” slide switch next to the
RS-485 terminal block to the “In” position.

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Setting HGM Communication Address On Adapter

See Figure 4 for the location of adapter dipswitch ‘A’.

Switches 5-8 on the adapter’s ‘A’ dipswitch are used to match the node address set on the
HGM’s address dipswitch (on HGM main board). Values from 0-15 are possible:

HGM address A5 A6 A7 A8

----------------- ---------------------------------------------­ 0 Off Off Off Off
1 Off Off Off On
2 Off Off On Off
3 Off Off On On
4 Off On Off Off
5 Off On Off On
6 Off On On Off
7 Off On On On
8 On Off Off Off
9 On Off Off On
10 On Off On Off
11 On Off On On
12 On On Off Off
13 On On Off On
14 On On On Off
15 On On On On

Since the HGM is the only node on the adapter-to-HGM interface, address 1 is normally
used. Be sure to set the same address on the adapter and the HGM main board
dipswitches.

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