Panasonic U-4LE1E5 Service Manual page 125

3. Mini VRF System Alarm Codes
P16 Overcurrent of Inverter Compressor
1. Meaning of Alarm
• Secondary current effective value detected the overcurrent (trip current value).
Single-phase model : Trip current = 24.0 A
• Secondary current instantly detected over xx A.
Single-phase model : xx A = 45.0 A
2. Check of content
0 Multiple
Replaced the compressor (added oil, if it was necessary)
0-1
factors
but it occurred again immediately.
0-2 Replaced the board, but it occurred again immediately.
1 Power
1-1 Power cord connections are loose.
Source
Rated power voltage is not within + 10%.
1-2
1-3 Extreme fluctuations in voltage.
1-4 An open phase state is observed.
2 Board
Disconnected parts, miswiring and/or poor connections (loose)
wiring
are observed in the connections on the CR board and/or in the
2-1
connections of components that are connected by wiring from
the CR board.
Disconnected parts, miswiring and/or poor connections (loose)
2-2 are observed in the connections of outdoor board(s) that are
connected by wiring from the CR board.
Disconnected parts, miswiring and/or poor connections (loose)
2-3 are observed in the connections of outdoor board(s) that are
connected by wiring from the HIC board.
Disconnected parts, miswiring and/or poor connections (loose)
2-4 are observed in the connections of HIC boards connected by
wiring from the CR board.
Disconnected parts, miswiring and/or poor connections (loose)
2-5 are observed in the connections of HIC board(s) that are
connected by wiring from the outdoor board.
Disconnected parts, miswiring and/or poor connections (loose)
2-6 are observed in the connections of HIC board(s) that are
connected by wiring to a compressor.
3
Disconnections and/or miswiring are observed in the
3-1
Compressor
connecting location of the compressor terminals.
wiring
Conditions such as burned terminal covers and/or discolored
3-2 terminals are observed in the connecting location of the
compressor terminals.
3-phase model : Trip current = 18.0 A
3-phase model : xx A = 36.0 A
5 - 45
Mini VRF SYSTEM
Trouble Diagnosis
Yes 7-1
No -
Replace compressor
Yes along with adding oil,
then recheck from 1-1
No -
Correct the wiring
Yes
No 1-2
Yes Test the power supply
No
1-3
Yes Test the power supply
No 1-4
Yes Test the power supply
No 2-1
Yes Correct
No 2-2
Yes Correct
No 2-3
Yes Correct
No 2-4
Yes Correct
No 2-5
Yes Correct
No 2-6
Yes Correct
No 3-1
Yes Correct
No 3-2
Eliminate looseness by
changing the terminals,
Yes
or crimping the
terminals again.
No 4-1
5