Single Phase and Three Phase Operation Mode
The UMC is designed for protection and control of three phase motors (default operation mode). But it is also possible to use the
UMC100.3 with single phase motors. To change the number of phases set parameter "Number Of Phases" to "1 Phase".
In single phase operation mode the following functions are not available:
• Phase sequence supervision
• Phase loss protection
• Frequency supervision
• Phase imbalance protection
Use UMC current transformer L2 for the phase conductor and L1 for the neutral conductor. Feeding the neutral
conductor through the CT is optional and only required for the earth fault detection function.
Relevant Parameters:
• Number Of Phases
Stand-Still Supervision
The UMC can supervise the stand-still time of a motor. In the case the motor was not started for a user defined time the UMC can
generate a warning. This warning might then be used in a customer specific way e.g. to perform a test start or do an inspection.
Relevant Parameters:
• Motor stand still level (Mot. stand still lev)
This function requires that UMC100.3 is supplied by control voltage during that time.
Run-Time Supervision
The UMC can supervise the run-time of a motor. In the case the motor exceeds the configured run-time the UMC can generate a
warning. This warning might then be used in a customer specific way e.g. to trigger motor maintenance.
Relevant Parameters:
• Motor operation hours level (Mot. op. hours level)
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