Delta MM300 Instruction Manual Page 142

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CHAPTER 6: SETPOINTS CONTROL ELEMENTS
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL 6–55
If the motor was not running at the start of the dip, no restart sequence will be initiated.
Start controls are ignored while the UVR delay is timing out. While the UVR timer is
counting down, the status will change to "UVR Pending". During UVR Pending, any stop or
trip will immediately cancel the restart sequence.
With control voltage derived from the incoming motor supply, the MM300 will experience
the same interruption as the motor. The MM300 is designed to ride through power outages
of up to 500 ms, so that the undervoltage restart function is accurate. For longer outages
the relay saves critical data to non-volatile memory just before shutting down. While the
relay is shut down, a backup timer continues to keep time without external power by using
stored energy.
Figure 31: Undervoltage autorestart screen
The following setpoints are available:
[Path: Home > Setpoints > Control > UV restart]
Under Voltage Restart
Range: Enabled, Disabled
Default: Disabled
This setpoint enables the undervoltage autorestart function.
UVR Dropout Level
Range: 60 to 100% of NCV in steps of 1
Default: 65%
When the magnitude of the control voltage drops below the UVR Dropout Level, the
motor contactor(s) are de-energized. The UVR Dropout Level is set as a percentage of the
nominal control voltage. This value programmed must be set lower than the UVR Pickup
Level setpoint.
UVR Pickup Level
Range: 60 to 100% of NCV in steps of 1
Default: 90%
When the magnitude of the control voltage recovers to the UVR Pickup Level, the
undervoltage restart element is triggered. The UVR Pickup Level is set as a percentage of
the nominal control voltage. This value programmed must be set higher than the UVR
Dropout Level setpoint.
UVR Short Dip Time
Range: 100 to 500 ms in steps of 10 ms, or OFF
Default: 200 ms
This setpoint represents the maximum duration of short dips, which result in immediate
restarts. A value of Off disables immediate restarts.
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