Polymetaal

Checking the electrical circuit of the JZE.

First read User Manual JZE-150 !

To do the necessary measurements you need a voltmeter.
Put voltmeter on 300 VAC range.
Measure on terminals 1 & 2, you should read appr. 230 VAC

Put voltmeter on 50 VAC range.
Measure on terminals 5 & 6, you should read appr. 20 VAC.
if not: check fuse F3 (control circuit fuse).
If fuse is OK, but no 20 VAC on terminals 5 & 6, transformer should be checked by electrician.

Voltmeter range on 50 VAC range.
Measure on terminals 6 & 7, you should read 20 VAC.
If not: pushbutton OFF is blocked.
Measure on terminals 6 & 8, you should read 20 VAC.
If not: Emergency stop is in off position.
Measure on terminals 6 & 10, you should read 20 VAC.
If not: Safety circuit is blocked.

Voltmeter range on 50 VDC range.
Measure on terminals 15 & 17, you should read appr. 28 VDC.
If not: check on transformer terminals + & -.
You should read 28 VDC, if not check rectifier.
The safety circuit can be short-circuited, but this can be dangerous for the press operator.
Turn Main Switch in OFF position.
Connect a wire between 8 & 10.
Turn Main switch ON.
If the machine is working properly, the safety circuit should be checked, see also manual.

If not, remove wire between terminals 8 & 10.
Voltmeter on 50 VAC range.
Push button rightwards, relays KO and KR must operate now, if not check limit switch rightwards:
Voltmeter on resistance range (ohms), main switch OFF and bed plate appr. in the middle of the press. (between rolls)
Measure terminals 11 & 12, you should read appr. 0 Ohm.
Measure terminals 13 & 14, you should read appr. 0 Ohm.
If not, check limit switches.