3-9
Note 1.
In many cases, signal cable errors will be detected together with encoder or resolver discon-
nection errors.
Note 2.
If the cable contact is improper, the resistance of the cable will vary slightly. To check a slight
difference in resistance in such a case, use a multimeter that has a m
W
range.
Encoder (Resolver) Disconnection
·
An alarm will go off if there is no encoder or resolver voltage output.
Alarm Indication
U Series: A. C3, A. C4
H Series: E1
M Series: A. L-6
R Series: RE. E
Probable cause
Item to check
Countermeasure
Abnormal encoder signal lines.
Abnormal resolver signal lines.
·
The signal lines are discon-
nected.
·
The signal lines are short-cir-
cuited.
* Check the resistance of the
cable alone.
·
Replace the encoder cable.
·
Replace the resolver cable.
Motor overheating.
·
The surface temperature of the
encoder exceeds 70
°
C. (Applica-
ble to H and R Series only.)
·
Decrease the motor ambient
temperature.
·
Take the same countermeasures
as those against motor overload.
Encoder or resolver malfunctions.
·
Do not turn any output signal of
the encoder on and off if the volt-
age of the output signal between
the output terminal and the pow-
er supply ground of the encoder
is 2.5 V min.
·
The resistance between each
combination of these terminals
of the resolver is far from the
rated resistance.
SIN energized terminals:
100
W
COS energized terminals:
110
W
Resolver output terminals:
5,000
W
·
Replace the motor.
Signal errors caused by noise.
·
None of the above items applies.
·
The frequency and conditions of
error are indefinite.
Take countermeasures against
noise. Refer to
Chapter 4
Countermeasures Against Noise
.
Note 1.
In many cases, signal cable errors will be detected together with encoder or resolver discon-
nection errors.
Note 2.
If the cable contact is improper, the resistance of the cable will vary slightly. To check a slight
difference in resistance in such a case, use a multimeter that has a m
W
range.
Servo Driver Errors
Chapter 3
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