2. Control Functions
Control of Master/Slave group
SMGB0097 rev.0 - 07/2015
43
2
2.3.3 Operation method
One group composed of multiple
modules
using the functions to control the number of units is called a "system".
1
Operation Order (Required)
Input "System Operation Order" for the chiller unit set as Unit 1.
It is also possible to put the system to operation from the "Local system operation switch" installed inside the electrical
box.
Control board of unit number 1
Run
(*)
System operation
order switch
Stop
System operation
order switch
System
ON
OFF
Run
Stop
*System operation orders are level signals
N O T E
Pay attention to the fact that it is different from the Run/Stop Order (Terminal No. 5,6,7 ) in the case of standalone
operation of the Chiller Unit.
2
Pump Interlock Wiring (Required)
Input the feedback signal of the pump to all the chiller units. (also necessary in the case of batch pump)
Chiller units without pump feedback signal input will not operate.
Pump feedback signal
3
Pump operation order wiring (Not required for specifications with pump mounted)
Connect the wiring, since pump operation signal is output from each chiller unit. Since it is possible to output the pump
operation signal of all chiller units during system operation in the case of 1-pump systems, then in the case of batch
pump, attach wiring to the chiller unit set as unit 1 only. (Connect interlock wiring to all the units )
4
Remote display wiring
Output from unit 1 only Output from each unit
Notes
System Operation
〇
Output from terminal No.23.
Chiller Unit (Module) Operation
〇
Pump Operation
〇
Alarm
〇
Warning
〇
