334 01-6203-01R3, CG Drives & Automation
10.15.2. Restart protection
The integrated restart protection is to prevent a restart in the lower frequency range if the
mains voltage was only interrupted briefly (mains recovery before the motor stands still).
• In the default setting 0x2D66:008 (P721.08) = 0 Hz, the restart protection is
deactivated.
• In order to activate the restart protection, set the restart threshold in [Hz] in
0x2D66:008 (P721.08) below which no automatic start shall take place after mains
recovery.
• If, in case of mains recovery, the output frequency is below the restart threshold, the
restart protection gets active:
• If the current DC-bus voltage is lower than the voltage setpoint 0x2D66:005
(P721.05), the motor is continued to be decelerated (until frequency 0 Hz).
• If the current DC-bus voltage is higher than the voltage setpoint 0x2D66:005
(P721.05), the motor is accelerated in a controlled way until the output frequency
exceeds the restart threshold.
•
If, in case of mains recovery, the output frequency is above the restart threshold, the
motor is accelerated again to the frequency setpoint.
Fast mains recovery
318
Diagnostic parameters:
• An active restart protection is displayed via the status bit 0 in 0x2D66:009 (P721.09) if
the mains failure control is not active.
Terminating the active restart protection
If, after mains recovery, the restart protection is active, it can be terminated by the
following actions:
• Error reset via the trigger set in 0x2631:004 (P400.04).
• Short-time inverter disable via the trigger set in 0x2631:001 (P400.01).
• Restart via the trigger set in 0x2631:002 (P400.02).
10.15.3. Fast mains recovery
A fast mains recovery is caused by a short interruption at the energy supply company (for
instance due to a thunderstorm) and by faulty components in the supply cables (for
instance slip rings).
The fast mains recovery causes a restart of the motor
• if the restart protection is deactivated (0x2D66:008 (P721.08) = 0 Hz, default setting) or
• the restart protection does not get active (output frequency > 0x2D66:008 (P721.08)).
If this
behaviour is not desired, you can decelerate the restart by setting a switch-off time
in 0x2D66:007 (P721.07) or prevent it in connection with the restart protection.
Restart pro-tection 318
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