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12·2
Troubleshooting Flowchart
12·2·1 The following describes how to check if the motor does not rotate:
(
Motor does
)
not rotate
Is the motor
NO
wiring correct?
Correct motor wiring
YES
NO
L 1 (R), L2(S) and/or L3(T) are not
Is CHARGE lamp lit?
powered, or fuse is blown.
YES
Control voltage present?
NO
There is no power on T4 and/or RD
power source (+24,
are not powered, or the control fuse
is blown. Is the power LED on gate
±15, +5V)
(base) PCB turned on?
YES
Is there speed reference
NO
(voltage on REF or
Correct wiring
current on JRF)?
YES
Are terminals COM, 8T
NO
and RUN on PCB
Correct wiring as specified in
wired correctly?
standard wiring diagrams.
YES
Is waveform of PWM
NO
signal (+U
-W) present?
Control printed circuit board
See Section 2"2"3
,.....
is bad - replace.
~
YES
Are base drive signals pres-
NO
If any of FU 1, FU2, FUR, FUS and FUT is
ent to the gate drive board.
I--
blown, check rectifiers and output tran-
See section 12"2"2.
sistors for any damage. See External
YES
Views of Unit in Chapter XI for parts
location.
Gate drive circuit board
is bad - replace.
12-7
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