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

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-

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.

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.

GROUND-INTEGRITY TRIP SE-525 0PERATION POWER INDICATION GROUND-INTEGRITY TRIP TRIP RELAY ENERGIZED EARTH-LEAKAGE TRIP RESET 10 150 200 300 400 500 100 80 60 30 GF LEVEL (mA) 30 400 500 600 800 1000 300 200 100 55 GF TIME (ms) FIXED FREQENCY 1 2 3 4 5 NON-FAIL-SAFE CT VERIFY ON AUTO RESET VARIABLE FREQ. CT VERIFY OFF FAIL-SAFE LATCHING

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 22 24 21 23 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

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