4. Troubleshooting
Inspection of power source and connections
SMGB0097 rev.0 - 07/2015
90
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
Inspection Method
1
Is the power source breaker or the fuse broken?
Examine the secondary voltage of the breaker and the passage of electric
current through the fuse with a tester.
2
Is the secondary voltage of the transformer
flowing out correctly?
Remove the connection of the secondary side of the transformer, and
measure the (AC) voltage with a tester. Confirm that the voltage shown on
the transformer is being output.
Voltage
and
circuit
30.0
V
230
V
15.5
V
16.1
V
PCN2A
(CPU PCB)
5
3
T
1
Red
White
Internal transformer of the unit
Red
Red
Blue
Blue
Orange
Orange
At rated
load
30.0
V
230
V
15.5
V
16.1
V
PCN239
PCN240
(I/O PCB)
5
3
T
1
and
Red
At rated
load
Green
Orange
Orange
Blue
Blue
Red
Red
White
Internal transformer of the unit
230
V
20.1
V
PCN238
㻔 㻵 㻛 㻻 㻌 㻼 㻯 㻮 㻕
5
3
T
1
Red
At rated
load
Red
Red
White
Internal transformer of the unit
3
Is there any loose wiring or miswiring?
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