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

2. Control Functions
Control functions on the module

2.1.10 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 no.1 (master unit). This function becomes enabled in all the units when inputting the signal to unit no.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.
23
SMGB0097 rev.0 - 07/2015
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
Power
Forced load
source of
up switch
the local
control
SW5
board
2