Operation For Momentary Power Interruptions - YASKAWA SGD7S Product Manual

6.2

Operation for Momentary Power Interruptions

Even if the main power supply to the SERVOPACK is interrupted momentarily, power supply to
the motor (servo ON status) will be maintained for the time set in Pn509 (Momentary Power
Interruption Hold Time).
Momentary Power Interruption Hold Time
Pn509 Setting Range
If the momentary power interruption time is equal to or less than the setting of Pn509, power
supply to the motor will be continued. If it is longer than the setting, power supply to the motor
will be stopped. Power will be supplied to the motor again when the main circuit power supply
recovers.
Setting of Pn509 ≥ Momentary power interruption time
Main circuit
power supply
Setting of
Pn509
Motor power
Power supplied.
status
1. If the momentary power interruption time exceeds the setting of Pn509, the /S-RDY (Servo
Information
2. If uninterruptible power supplies are used for the control power supply and main circuit
3. The holding time of the SERVOPACK control power supply is approximately 100 ms. If
The holding time of the main circuit power supply depends on the output from the SERVOPACK.
If the load on the Servomotor is large and an A.410 alarm (Undervoltage) occurs, the setting of
Pn509 will be ignored.
Important
Setting Unit
20 to 50,000 1 ms
Momentary power interruption
Momentary power
interruption ≤ Pn509
Pn509
Power supply
continued.
Momentary power interruption
Ready) signal will turn OFF.
power supply, the SERVOPACK can withstand a power interruption that lasts longer than
50,000 ms.
control operations become impossible during a momentary power interruption of the con-
trol power supply, the setting of Pn509 will be ignored and the same operation will be per-
formed as for when the power supply is turned OFF normally.

6.2 Operation for Momentary Power Interruptions

Speed
Default Setting When Enabled
20 Immediately
Setting of Pn509 < Momentary power interruption time
Momentary power interruption
Main circuit
power supply
Setting of
Pn509
Pn509
Motor power
Power supplied.
status
Momentary power interruption
Position Torque
Classification
Setup
Momentary power
interruption > Pn509
Power not
supplied.
Power shut OFF.
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