Entron EN1000 series Instruction Manual

*
NOTE:It is a good practice to replace both ignitron tubes or the defective
Page 57
tube with a tube of approximately the same service life as the remaining tube
710256
.
TROUBLE
POSSIBLE CAUSE
REMEDY
____________________________________________________________________________________
Control sequences
but will not weld.
---------------------------
Weld light on
continuously with
Weld/No Weld Switch
in NO WELD
position.
I.
External Weld/No-Weld Switch,
or Weld/No-Weld Switch on
front panel of control.
II. Open Temperature Limit Switch.
III. Ignitor leads reversed on control
used with existing ignitron tube
contactor.
IV.
Welding transformer tap switch
in OFF position.
V.
Welding transformer secondary
open. (Weld light may light.)
VI.
Defective Terminal Strip/Firing
PCB.
VII. Defective Control/Display
PCB.
--------------------------------------------
I.
Shorted ignitron tube or thyris-
tor (SCR).
II.
Ignitor circuit of ignitron tube
shorted to ground.
III.
Defective Ignitron Firing
Module.
1.
Check both for proper operation
and/or loose wires on NW1 &
GND
2.
If no external Weld/No-Weld
Switch is used, connect jumper.
1. Contactor overheated, causing
Limit Switch to open
2.
Defective Limit Switch. Replace
Limit Switch.
3.
Connect jumper across
TLS1/AUX1 & GND if TLS is
not used.
1. Interchange leads.
1.
Set to ON or at one of the tap
positions.
1.
Check for corroded or open
connections. Be sure welding
electrodes close on work.
1.
Replace board. See wiring
diagram for correct Assembly
Number.
1. Replace board with another board
stamped with the same Assembly
Number.
--------------------------------------------
1.
Check that mercury in ignitron
tube has not splashed up (tap tube
lightly) CAUTION: turn
power
off.
2.
Replace defective tube
*
or SCR.
1.
Check ignitor leads.
1.
Replace Board. See wiring
diagram for correct Assembly
Number.

Entron EN1000 series Specifications

General

Brand	Entron
Model	EN1000 series
Category	Controller
Language	English