Hitachi SAMURAI Series Service Manual page 120

4. Troubleshooting
Inspection of power source and connections
4.1 Inspection of power source and connections
In case that there is any abnormality in the activation of the chiller unit, first perform the following check.
No. Check Item
1 Is the power source breaker or the fuse broken?
Is the secondary voltage of the transformer
2
flowing out correctly?
3 Is there any loose wiring or miswiring?
112
SMGB0082 rev.1 - 07/2015
Inspection Method
Examine the secondary voltage of the breaker and the passage of electric
current through the fuse with a tester.
Remove the connection of the secondary side of the transformer, and meas-
ure the (AC) voltage with a tester. Confirm that the voltage shown on the
transformer is being output.
Internal transformer of the unit
White
230Ｖ
Red
5 3
P C N2 A
(C P U P C B )
White
230Ｖ
Red
5 3
PCN23 9
and
PCN24 0
(I/O PCB )
White
2 3 0Ｖ
Red
5 3
PC N2 38
Confirm that there are is no looseness in the wiring connections with PCB,
etc., or that there are no mistakes in local wiring, using the electrical wiring
diagrams as a reference.
• Plugs for connection of wiring of the sensors (each of them)
• Plugs for connection of flat cable
• Plugs for connection of transformer connection
• Plugs for each connection of 230V circuit
T
1
Red
30.0 Ｖ
Red
Blue
At rated
15.5 Ｖ
load
Blue
Orange
16.1 Ｖ
Orange
Internal transformer of the unit
T
1
Red
30.0Ｖ
Red
Blue
15.5Ｖ
At rated
load
Blue
Orange
16.1Ｖ
Orange
Green
Internal transformer of the unit
T
1
Red
2 0 .1Ｖ
At rated
load
Red