Bacharach HGM300 Installation & Operation Manual - page 6
6
Instruction 3015-4149
SECTION 4
Basic HGM300/RDM800 Monitor System Connections
Most applications for the HGM300/RDM800 monitor system will consist of a single HGM300 and a single
RDM800. The HGM300 should be mounted in the mechanical room and the RDM800 should be located
in a control room, on an outside wall of the mechanical room or at least, just inside the door to the
mechanical room.
Connect 120 or 230 VAC power (voltage dependent on sales order) to the HGM300 as follows:
• 120 VAC Installations – Connect power to the two-lead AC IN power connector on the far right
bottom of the power supply PC board. Make the ground connection to the Ground Stud located
just below the power connector. IMPORTANT: The AC input ground wire (green) must be on the
bottom of the Ground Stud to meet agency approval.
• 230 VAC Installations – Connect power to the AC Input Line Filter mounted below the Power
Supply board. Make the ground connection to the Ground Stud located just below the power
connector. IMPORTANT: The AC input ground wire (green) must be on the bottom of the Ground
Stud to meet agency approval.
Auxiliary power to supply 120 or 230 VAC to the external alarms is available from the second two-lead
connector located to the left of the main power connector. Connect any alarms required to the four-relay
connector marked “LEAK, SPILL and EVAC”. Connect the “SYSTEM FAULT” relay if used.
The dual 4-20mAdc output connector is located on the left side of the HGM300 main PC board. This is a
SIGNAL OUT ONLY function. Both loops must be wired if this option is installed. If only one loop is used,
the unused loop must have a jumper wire installed.
Connect 120–230 VAC power to the RDM800 by removing the four screws holding the front panel to the
RDM800 chassis. Turn the front panel over and perform one of the following:
• 120 VAC Installations – Connect power to the two-lead connector on the far right bottom of the
PC board. Make the ground connection to the Ground Stud provided on the chassis.
IMPORTANT: The AC input ground wire (green) must be on the bottom of the Ground Stud to
meet agency approval.
• 230 VAC Installations – Connect power to the AC Input Line Filter located on the chassis. Make
the ground connection to the Ground Stud provided on the chassis. IMPORTANT: The AC input
ground wire (green) must be on the bottom of the Ground Stud to meet agency approval.
Connect any alarms to the two-relay connector located on the bottom center of the RDM800 PC board.
The RS-485 communication wiring between the HGM300 and RDM800 must be connected in the
following manner:
Locate the RS-485 connector marked “TO MONITOR” on the RDM800. This connector should be on
the far-left bottom of the RDM800 PC board. Connect one lead of a twisted shielded pair to the “B”
connection point (the far left point), note the wire color. Connect the second wire to the “A” connection
point (the middle), note the wire color. Connect the ground to the “GND” connection point.
Make the wire run to the HGM300 and connect the twisted shielded pair to the HGM300 RS-485
connector using the same color code as used on the RDM800.
NOTE: With a basic system consisting of a single HGM300 and a single RDM800 the position of the
“Terminator” switches is not critical.