Operation Method - Hitachi SAMURAI Series Service Manual

2 Control Functions
Control of Master/Slave group

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
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.
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
System Operation
Chiller Unit (Module) Operation
Pump Operation
Alarm
Warning
41 SMGB0120 rev.0 - 11/2017
System operation
order switch
(*)
System
System operation
Run
order switch
Pump feedback signal
Output from unit 1 only Output from each unit
〇
ON
OFF
Run
Stop
Output from terminal number 23.
〇
〇
〇
〇
Notes
2