BENSHAW RediStart EXEXMVRMX3 Series, User Manual

Page: 90 / 222

Zero Sequence Ground Fault Trip Level PFN 08
LCD Display
Range
Off, 1.0 – 25.0 amps
(Default: Off)
Description The Zero Sequence Ground Fault parameter sets a ground fault current trip or alarm level that can be used to
protect the system from a ground fault condition. In isolated or high impedance-grounded systems,
core-balanced current sensors are typically used to detect low level ground faults caused by insulation
breakdowns or entry of foreign objects. Detection of such ground faults can be used to interrupt the system to
prevent further damage, or to alert the appropriate personnel to perform timely maintenance.
Ground Fault Trip: The EXMVRMX
3
will trip with a ground fault indication if:
- No other fault currently exists.
- Ground fault current is equal to or greater than the GF Trip Level for a time
period greater than the GF Trip Delay (PFN 09).
Once the starter recognizes a ground fault condition, it will shut down the motor and display a fault
F38-Ground Fault.
If a programmable relay (I/O 10 - 15) is set to "Ground Fault", the starter energizes the relay when the
condition exists.
z
NOTE: The EXMVRMX
3
zero sequence ground fault detection consists of installing a Cat. No
BICT-2000/1-6 (50: 0.025 amps) core balance current transformer to terminal J15 Gnd Flt located on the I/O
card.
See Also
Ground Fault Trip Time (PFN 09) on page 80.
Auto Reset parameter (PFN 23) on page 84.
Controlled Fault Stop (PFN 25) on page 85.
Relay Outputs (I/O 10 - 15) on page 91.
Ground Fault Trip Time PFN 09
LCD Display
Range
0.1 – 90.0 seconds
(Default: 3.0)
Description The Ground Fault Trip Time parameter can be set from 0.1 to 90.0 seconds in 0.1 second intervals.
See Also
Residual Ground Fault Trip Level (PFN 07) on page 79.
Zero Sequence Ground Fault Trip Level (PFN 08) on page 80.
80
6 - PARAMETER DESCRIPTION
Alarm
Condition
Fault
Trip
Amps
Ground Fault
Trip Time
PFN 09
Zero Sequence Gnd
Fault Level
PFN 08
Time
PFN: Gnd Flt Time
09
3.0 sec
PFN: ZS GF Lvl
08
Off