1. EARTH-LEAKAGE AND GROUND-INTEGRITY MONITOR
SE-525
EARTH-LEAKAGE AND GROUND-INTEGRITY MONITOR

2. WHY MONITOR THE GROUND INTEGRITY?
PORTABLE EQUIPMENT
+ V-
LOW GROUND RESISTANCE = LOW VOLTAGE BETWEEN EQUIPMENT AND GROUND DURING A FAULT
FAULT CURRENT
GROUND CONDUCTOR
PORTABLE EQUIPMENT
BROKEN GROUND CONDUCTOR
FAULT CURRENT
HIGH GROUND RESISTANCE = HAZARDOUS VOLTAGE BETWEEN EQUIPMENT AND GROUND DURING A FAULT
+ V-

3. EARTH-LEAKAGE AND GROUND-INTEGRITY MONITOR
The SE-525 is a microprocessor-based earth-leakage and ground-integrity monitor for welding applications. The SE-525 will detect one ohm of ground resistance and as low as 10 mA of ground-fault current.

4. SE-525 FEATURES
LED and fluorescent-flag trip indication for both earth-fault and ground-integrity fault.
Autoreset or Latching trips.
Local and remote reset.
Form C Trip relay.
Two form C Indication relays.
4-20 mA analog output.
Harmonic filtering (DFT)
CT verification.
Earth-fault test using CT-primary injection.
One-ohm ground integrity test.
Conformal coating for corrosion resistance.

5. GROUND-INTEGRITY TRIP
SE-525 0PERATION
POWER INDICATION
GROUND-INTEGRITY TRIP
TRIP RELAY ENERGIZED
EARTH-LEAKAGE TRIP
RESET 10
150
GF LEVEL (mA) 30
400
GF TIME (ms)
FIXED FREQENCY
NON-FAIL-SAFE
CT VERIFY ON
AUTO RESET
VARIABLE FREQ.
CT VERIFY OFF
FAIL-SAFE
LATCHING

6. SE-525 TYPICAL APPLICATION
SPOT WELDER
GROUND CONDUCTOR
GROUND INTEGRITY TEST
SENSE LEAD M
SE-CS30-X
GROUND FAULT TEST
REMOTE RESET
SPOT
1 Ω
GROUND TEST
Alternate two-wire ground integrity connection used when the resistance of the sense lead is in the one-ohm range.
4-20 mA OUTPUT
GROUND-FAULT INDICATION RELAYS N.O. & N.C.
GROUND INTEGRITY INDICATION RELAYS N.O. & N.C. L1
120 VAC N M

7. SE-525 TYPICAL APPLICATION
GROUND FAULT
POWER
GROUND INTEGRITY
RESET
TO WELDER