8-50
8-6 Extended Parameters
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
8
Parameter Details
Explanation of Set Values
If an alarm occurs when the main power supply is turned OFF, the operation will be based on the Stop
Selection for Alarm Detection
(Pn510). If the main power supply is turned OFF when Servo is ON,
and if the Undervoltage Alarm Selection (Pn508) is set to 1, Alarm 13.1, "main power supply
undervoltage (AC cut-off detection)," will occur. Follow the Stop Selection for Alarm Detection
(Pn510).
The dynamic brake is designed only for emergency stopping. Design the system to stop within
about ten minutes after the dynamic brake operates.
*1.
Emergency stop refers to an immediate stop operation applying control while servo is still ON and stopping
the operation immediately.
At that time, the torque command value is restricted by the Immediate Stop Torque (Pn511).
*2.
If the position command is given or the motor runs continuously when the main power supply is turned OFF, the
position error accumulates and Alarm 24.0, "error counter overflow," may occur. In addition, if servo is turned ON when
the position error or external encoder error is a large value, the motor may operate abruptly to perform a control
operation to bring the error to 0. Take sufficient care when using while holding the position error or external encoder
error.
*3. Decelerating is the time between when the motor is running and when the motor speed reaches 30 r/
min or less. Once the motor reaches 30 r/min or less and moves to the after-stop status, subsequent
operation is based on the after-stop status regardless of the motor speed.
*4. The position error or external encoder error will always be cleared to 0.
Explanation of Set Values
Pn507
Stop Selection with Main Power Supply OFF
Setting
range
0 to 9 Unit −
Default
setting
0
Power OFF
and ON
−
Set
value
Explanation
During deceleration *
3
After stopping Error counter
0 Dynamic brake operation Dynamic brake operation Clear *
4
1 Free-run Dynamic brake operation Clear *
4
2 Dynamic brake operation Servo free Clear *
4
3 Free-run Servo free Clear *
4
4 Dynamic brake operation Dynamic brake operation Hold *
2
5 Free-run Dynamic brake operation Hold *
2
6 Dynamic brake operation Servo free Hold *
2
7 Free-run Servo free Hold *
2
8 Immediate stop *
1
Dynamic brake operation Clear *
4
9 Immediate stop *
1
Servo free Clear *
4
Pn508
Undervoltage Alarm Selection
Setting
range
0 or 1 Unit −
Default
setting
1
Power OFF
and ON
−
Set value
Description
0
The servo is turned OFF based on the setting of the Stop Selection with Main Power Supply
OFF (Pn507) and turn it back to servo ON state by turning ON the main power supply.
1 Alarm 13.1 "main power supply undervoltage" will occur and a trip will be caused.
Pn509
Momentary Hold Time
Setting
range
70 to 2,000 Unit 1 ms
Default
setting
70
Power OFF
and ON
Yes
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