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020
E417
Alarm
Power voltage sensor PT failure
Logic
Possible
1. Open circuit between connector X61A (PT/CT board)〜 X4A (CPU board)
Causes
2. Fuse F11U is open (on PT/CT board)
3. Voltage sensor PT failure (on PT/CT board)
Trouble
Step 1. Check connector X61A (PT/CT board) and X4A (CPU board).
Shooting
Make sure it is properly installed..
Step 2. Check if there is short circuit in secondary side of fuse F11U (ZNR, primary side of Tr).
If shorted, replace the PT/CT board.
Step 3. If repeat the alarm with no short circuit, replace the PT/CT board.
Controller
E417 Alarm display only
Action
021
E419
Alarm
Current sensor CT failure
Logic
Possible
＊Open circuit between connector X61A (PT/CT board)〜 X4A (CPU board)
Causes
＊Current sensor CT failure（in PT/CT board）
Trouble
Step 1. Check connector X61A(PT/CT board) / X4A(CPU board) and make sure it is properly
Shooting
installed.
Step 2. Replace PT/CT board.
Controller
E419 Alarm display only
Action
X62A
F11U
ZN
R
PT/CT board
Surge absorber
Tr
X63A
F11U
X62A
2-34
X63A
Tr
ZNR
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