Forced Load Up Capacity Control From External Signal - Hitachi SAMURAI Series Service Manual

2 Control Functions
Control functions on the module

2.1.9 Forced load up capacity control from external signal

It is possible to force load up according to usage purpose.
a. Contents of activation
It is possible to force load up from the orders of local control panel.
b. Time chart
Capacity
control
c. Wiring method
Control board of the chiller unit
150
?
N O T E
• Thermo OFF judgement, protection devices and protection control from the setting temperature of the main unit are always enabled,
and this control gives them priority.
• When using the function to control the number of units (however excluding the connection to group controller),arrange the wiring to
unit number 1 (master unit). This function becomes enabled in all the units when inputting the signal to unit number 1.
• In case of connection to a group controller, the valid orders are those sent from the group controller. Signal input to the main unit of
the chiller unit is invalid.
21 SMGB0120 rev.0 - 11/2017
Normal
operation
Forced load
up
Normal
ON
External
signal X
OFF
D
151 152 153 154
SW5
2 0V 3
Normal
operation
Forced load up
Forced load
up switch
SW5
Power
source of
the local
control
board
2