Dings Magnetic Group Stationary Electro Overhead Magnets - Manual (Page 12)

Revised January 19, 2011
STEP 2
Turn off and lock-out the power to the rectifier. Disconnect the three leads from the
transformer to the diode assembly inside the rectifier cabinet. Turn on the power to the
rectifier. Measure the AC voltage at the output of the transformer inside the rectifier cabinet.
1st Reading Phase 1 to Phase 2 Volts:
2nd Reading Phase 2 to Phase 3 Volts:
3rd Reading Phase 3 to Phase 1 Volts:
If all three voltage readings are 85 VAC + 5% for 115 VDC output rated rectifiers or 170 VAC +
5% for 230 VDC output rated rectifiers, the transformer is OK. Go to Step 3. If one or more of
the voltage readings are out of tolerance, replace the transformer or the entire rectifier.
STEP 3
Turn off and lock-out the power to the rectifier. Reconnect the three leads from the
transformer to the diode assembly at the transformer output lugs inside the rectifier cabinet.
Disconnect the two rectifier output leads to the magnet at the terminal block inside the rectifier
cabinet marked “+” and “-”. Turn on the power to the rectifier. Measure the DC output voltage
of the rectifier at the terminal block inside the rectifier cabinet marked “+” and “-”.
VOLTS:
If the reading is 115 VDC + 5% for 115 VDC output rated rectifiers or 230 VDC + 5% for 230
VDC output rated rectifiers, the rectifier is OK. Go to Step 4. If the voltage reading is out of
tolerance, replace the diode assembly.
STEP 4
Turn off and lock-out the power to the rectifier. Reconnect the two rectifier output leads to the
magnet at the terminal block inside the rectifier cabinet. Turn on the power to the rectifier.
Measure the DC voltage at the magnet box terminals on the magnet, not at the secondary
terminal box on the magnet if so equipped.
VOLTS:
If the reading is 115 VDC + 5% for 115 VDC output rated rectifiers or 230 VDC + 5% for 230
VDC output rated rectifiers, the leads and terminal blocks between the rectifier and the magnet
box terminals are OK. Go to Step 5. If the voltage reading is out of tolerance, replace or
repair the leads between the rectifier and the magnet, as leads may be damaged, loose or
undersized. Use caution not to rotate the studs in the magnet box terminals or the internal
connections may be damaged.
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