— 14-4 —
14.2. Description of Alarm
Caution : The DRDY output is normally closed. It opens on abnormal condition.
14.2.1. Normal State
l When the Motor does not operate even in normal state, following causes are suspected.
Table 14-2
Status Motor condition DRDY Cause Remedy
Power-off Servo-OFF open Power is not supplied. Turn on power.
CPU Initializing Servo-OFF open Initializing the CPU. Wait for the CPU to be initialized.
SVON Input OFF Servo-OFF close SVON input is not active. Activate the SVON input.
14.2.2. Alarms Related to Power Amplifier
14.2.2.1. Heat Sink Overheat or Regeneration Resistor Overheat
[Output] DRDY: Open
[TA] P0 > Over Heat
[LED] P0
[Motor Condition] Servo-OFF
Table 14-3: Cause and Remedy: Overheat of heat sink and regeneration resistor.
Cause Remedy
(1) Duty cycles of the Motor is too high.
(2) Excessive load is applied.
• Reduce the load and/or operation duty. Readjust
acceleration/deceleration.
(Stop operation, air-cool the Driver Unit.)
(3) Ambient temperature is above 50°C.
(4) Heat sink temperature exceeds 90°C due to
continued heavy torque demand.
• Check surrounding condition of the Driver Unit.
• Stop the operation and air-cool the Motor and Driver
Unit. Then check followings.
◊ Whether the duty cycle is too high.
◊ Whether excessive load is applied.
◊ If the ambient temperature of the Driver Unit is
too high.
• If no troubles are found in the above check and this
alarm occurs frequently, contact NSK.
(5) Defective PCB.
(As soon as the control power is turned on,
the alarm is activated.)
• Replace Driver Unit.
◊ Standard ESA Driver--------------------[Appendix 4]
Note : 1) Stop operation immediately.
2) Even the alarm is deactivated, it will be activated again when the thermal sensor is still
on.
• Take enough time to air-cool the Motor and the Driver Unit.
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