— 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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