Delta MM300 Instruction Manual Page 127

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6–40 MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
PROTECTION ELEMENTS CHAPTER 6: SETPOINTS
6.3.3.3 Load increase alarm
The load increase alarm is used to alarm abnormal load increases that may indicate
problems with the process. An alarm is enabled only after the acceleration phase is
complete and the motor has entered the running phase, and then only if the current has
fallen below the set pickup or one minute has elapsed. Once enabled, the alarm is
generated when the current exceeds the set pickup, and automatically resets when the
current has subsided.
The following setpoints are available.
[Path: Home > Setpoints > Protection > Electrical]
Load Increase Alarm Level
Range: 50 to 150% of FLA in steps of 1, or OFF
Default: OFF
This setpoint specifies the load increase alarm pickup level. A value of “OFF” disables the
load increase alarm.
6.3.3.4 Phase undervoltage
An undervoltage on a running motor with a constant load results in increased current. The
relay thermal model typically picks up this condition and provides adequate protection.
However, the phase undervoltage element may be used to provide for an advance warning
alarm and/or for tripping before the motor has heated.
In some motor manager relays, the undervoltage feature is used for additional conditions.
Instead, the MM300 uses the undervoltage restart element to handle loss of supply, and
the fuse fail element to cover main and VT fuse failure.
The element generates alarms or trips when any of the three phase-to-phase voltages
meets or falls below the pickup level.
NOTE
NOTE:
Phase undervoltage protection is available only when a type B option card (3 × VT) is
included in the order code.
The following setpoints are available.
[Path: Home > Setpoints > Protection > Electrical]
Undervoltage Alarm Level
Range: 60 to 99% of MNV in steps of 1, or OFF
Default: OFF
This setpoint specifies the phase undervoltage alarm pickup level as a percentage of the
rated voltage.
Undervoltage Alarm Delay
Range: 1 to 60 seconds in steps of 1second
Default: 30 seconds
This setpoint specifies the time that the voltage must be less than or equal to, the
undervoltage alarm pickup level to generate an alarm.
Undervoltage Trip Level
Range: 60 to 99% of MNV in steps of 1, or OFF
Default: OFF
This setpoint specifies the phase undervoltage trip pickup level as a percentage of the
rated voltage.
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