102
6 - PARAMETER DESCRIPTION
P37 Residual Ground Fault Trip Level PFN 06
LED Display LCD Display
Range Off, 5 – 100 % FLA (Default Off)
Description The Residual Ground Fault Trip Level parameter sets a ground fault current trip or indicate level that can be
used to protect the system from a ground fault condition. The starter monitors the instantaneous sum of the
three line currents to detect the ground fault current.
The ground fault current has to remain above the ground fault level for 3 seconds before the starter recognizes
a ground fault condition. Once the starter recognizes a ground fault condition, it shuts down the motor and
declares a Fault 38 (Ground Fault).
If a programmable relay is set to ground fault (GND), the starter energizes the relay when the condition exists.
A typical value for the ground fault current setting is 10% to 20% of the full load amps of the motor.
z NOTE: This is often referred to as residual ground fault protection. This type of protection is meant to
provide machine ground fault protection only. It is not meant to provide human ground fault protection.
z NOTE: The MX
2
residual ground fault protection function is meant to detect ground faults on solidly
grounded systems. Use on a high impedance or floating ground power system may impair the usefulness of
the MX
2
residual ground fault detection feature.
z NOTE: Due to uneven CT saturation effects and motor and power system variations, there may be small
values of residual ground fault currents measured by the MX
2
during normal operation.
See Also Auto Reset Limit (P42 / PFN 11) parameter on page 104.
Controlled Fault Stop Enable (P43 / PFN 12) parameter on page 105.
Relay Output Configuration (P52-54 / I/O 05-07) parameters on page 112.
Resid GF Lvl
PFN 06/P
37
%FLA
Ground Fault
Current
PFN: Resid GF Lvl
06 Off
To Next Page
Loading...
Need help?
General
