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4-14
Programming
Motor Protection
While the Basic Set Up group allows the user to get started with a
minimum number of parameters to modify, the Motor Protection group
allows full access to the SMC-Flex controller's powerful parameter set.
Following is a listing of the additional setup parameters provided.
Note: The majority of parameters have a Fault and an Alarm setting.
Parameter
Overload
Allows the user to select the operation of the
overload.
Underload
Determines the trip level as a percentage of the
motor’s FLA, and the delay period.
Undervoltage
Determines the trip level as a percentage of line
voltage and delay period.
Overvoltage
Determines the trip level as a percentage of line
voltage and delay period.
Unbalance
Allows the user to set the current unbalance trip
level and delay period.
Jam
Determines the trip level as a percentage of motor
full load current and delay period.
Stall
Allows the user to set the stall delay time.
Ground Fault
Allows the user to enable the ground fault level in
amps, delay time and inhibit time. A separate
core balance current transformer is required.
PTC
Allows the user to connect a PTC to the SMC and
enable a fault when it becomes active.
Phase Reversal
Determines the proper orientation of line
connections to the SMC. If Enabled and phases
are out of sequence, a fault will be indicated.
Restarts
Allows the user to determine the maximum number of
restarts per hour the unit can experience, and delay
time between consecutive starts.
Option
Trip Class, Service Factor,
Motor FLC, Overload Reset,
Overload Alarm Level
Underload Fault Level,
Underload Fault Delay,
Underload Alarm Level,
Underload Alarm Delay
Undervoltage Fault Level,
Undervoltage Fault Delay,
Undervoltage Alarm Level,
Undervoltage Alarm Delay
Overvoltage Fault Level,
Overvoltage Fault Delay,
Overvoltage Alarm Level,
Overvoltage Alarm Delay
Unbalance Fault Level,
Unbalance Fault Delay,
Unbalance Alarm Level,
Unbalance Alarm Delay
Jam Fault Level,
Jam Fault Delay,
Jam Alarm Level,
Jam Alarm Delay
Stall Delay
Ground Fault Enable,
Ground Fault Level,
Ground Fault Delay,
Ground Fault Inhibit Time,
Ground Fault Alarm Enable,
Ground Fault Alarm Level,
Ground Fault Alarm Delay
PTC Enable
Phase Reversal
Restarts Per Hour,
Restart Attempts,
Restart Delay
The delay time must be set to a value greater than zero when Undervoltage, Overvoltage and
Unbalance are enabled.
For Jam and Underload detection to function, the Motor FLC must be programmed in the Motor
Protection group. See page 4-16.
See details in Ground Fault on page 1-12.
See details in Thermistor/PTC Protection on page 1-13.
1560E-UM051A-EN-P – September 2005