Bard W48A2PQ, Инструкция по установке и обслуживанию

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Manual 2100-642
Page 40 of 82
LC SERIES PLC CONTROLLER
SEQUENCE OF OPERATION
Overview
The LC Series PLC controller is designed to operate
up to 12 Bard wall-mount units in a lead/lag fashion,
while offering extensive alarming capabilities as well as
remote communication. The duty of the PLC controller
is to monitor temperature and alarm conditions within
the shelter and to send cooling or heating orders to
one, or more, wall-mount units. The controller also
monitors the units and sends alarms.
Inputs/Outputs
The LC controller will make decisions and trigger
alarms by the use of inputs and outputs to various
field-installed connections to the terminal block. Please
refer to the Installation section of this manual for
further information on field-wire connections.
Power Inputs:
• 120 VAC, 208 VAC or 230 VAC power to terminals
1 (+) and 2 (-). This feeds the VAC to 24VAC
power, which then powers the board.
NOTE: Output
must be minimum 21.6 VAC to allow proper PLC
board operation.
Power Outputs:
• 24VAC power to hydrogen detector through
terminals 3 (+) and 4 (-). The + terminal block is
fused internally (see Componentry section).
• 24VDC power to smoke detector through terminals
6 (+) and 7 (-). The + terminal block is fused
internally (see Componentry section).
• -24VDC power to generator run relay contacts (if
available) on terminal 9.
Signal Inputs:
• 10K ohm remote indoor temperature sensor on
terminals 11 and 12.
• 10K ohm optional remote indoor temperature
sensor on terminals 13 and 14.
• 10K ohm optional remote indoor temperature
sensor on terminals 15 and 16.
Communication Output:
• Negative (-) communication wire to terminal 27.
• Positive (+) communication wire to terminal 28.
• Cable drain wire to terminal 29.
Isolation Relays and Alarm Schemes
• Low Temp: If 45°F is sensed in the shelter, the LC
board will send -24VAC to the low temp relay to
energize the relay, opening contacts on terminals
27 and 28. Additionally, the board will send
remote alarms.
• High Temp: If 90°F is sensed in the shelter, the LC
board will send -24VAC to the high temp relay to
energize the relay, opening contacts on terminals
25 and 26. Additionally, the LC will send remote
alarms and enable blowers and free cooling
dampers in an attempt to cool the shelter.