98 Rockwell Automation Publication DRIVES-AT005D-EN-P - May 2022
Appendix B Power Component Accessories
Ground Fault Indicator Filter
A ground fault occurs when there’s an imbalance of current in a system. The sum of the currents entering the node must equal the sum leaving the
node. The largest cause of the ground fault is the leakage current through power devices and other high impedance paths to ground.
Analog Filter
Digital Filter
In high-resistance grounded systems, a ground fault sensor is placed across the resistor to sense or detect these currents. When the threshold has
been exceeded, the sensor provides an alarm output that can initiate safety circuitry to disable a system.
The current waveform associated with a drive has a harmonic-rich current signature that can cause the ground fault indicator filter to trip. The
filter is designed to average the current signature, while still providing protection.
Follow the manufacturer recommendation to mount the ground fault indicator filter.
Analog Ground Fault Indicator Filter
The NEMA 1 enclosure is 226 x 335 x 335 mm (8.9 x 13.2 x 13.2 in.) and weighs 26 kg (57.3 lb).
Supplier Reference: Contact technical support for PN-50085 or Bryne & Schaefer for ER-101011.
3-Phase
AC Supply
Isolation
Transformer
HRG
Ground Fault
Indicator Filter
Ground Fault
Indicator
Volt Meter
HI
Out
HI
In
LO
In
LO
Out
L1
L2
L3
PE
3-Phase
AC Supply
Isolation
Transformer
HRG
HI
In
HI
Out
LO
In
LO
Out
Digital Ground Fault
Indicator Filter
Frequency Meter
Voltage Meter
Freq
Out
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