8. MAINTENANCE
8 - 21
8.2 Troubleshooting (Non-Alarm)
The following are the causes and corrective measures for troubleshooting non-alarm malfunctions. Consult
your Sanyo Denki dealer should the malfunctions persist even after performing these troubleshooting
measures. Please take note that it is dangerous to perform some of these procedures without first switching
off the main power supply.
Table 8-2 (1/2) Troubleshooting (Non-Alarm)
No
Malfunction Inspection
Causes and corrective
measures
(1) Check voltage of
control power input
terminals
• Check power supply if voltage is
low
• Check wiring and tightening of
screws if there is no voltage
1
7-segment LED does not display“≡
“ after control power supply is
switched on
(2) Check if red
“CHARGE” LED is on
• Faulty power supply circuit
→ Replace servo amplifier
(1) Check if position
command is inputted
• Input position command.
(2) Check if servo lock is
on
• Check tightening of screw as
motor power line is not connected
(3) Check if current limit is
inputted
• Motor does not rotate, since
current limiter is on and motor
cannot output the torque over
load torque.
2 7 segment LED is displaying a
flashing “8” (servo ON status), but
motor is not rotating
(4) Check if deviation
clear remains on
• Chancel the deviation clear
input (CN1-34 pin)
(1) Check if proportional
control is on
• Switch off proportional control
(2) Check if current limiter
is on
• Switch off current limiter
3 Unstable servomotor rotation.
Lower than command.
(3) Check if 7 segment
LED is displaying “ = ”
• EMR of serial communication
line is on
→ Remove EMR
(1) Check motor power
lines
• One of the power lines is
disconnected.
4 Servomotor rotates momentarily
before stopping
(2) Check sensor dividing
number setting
• Correct the setting and turn on
the power.
5 Motor vibrates at frequencies over
200Hz
• Reduce velocity loop gain
• Set current command low pass
filter and notch filter.
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