Tweco Troubleshooting Power Supply - Manual (Page 4)

4
External E-Stop
E-Stop input is on CCM module TB1-1&2. This circuit must be closed for
normal operation; open activates E-Stop, generating 1-1 code. CCM is supplied
from the factory with a jumper across TB1-1&2. The jumper may be replaced
with an external switch for remote E-Stop. D21 (CNC E-Stop) on the CCM I/O
PCB will light when TB1-1&2 is closed.
If D21 is not on, problem is missing jumper, defective external E-Stop switch
or its wiring or the CCM is defective. Note, the CCM is replaced as a unit;
individual boards are not replaced separately.
If D21 is on, then Plasma Enable circuit is causing the 1-1 code. K5, E-STOP
relay, when off, disables the power supplies power circuits and coolant pump.
Also disables the Gas Control preventing gas flow.
Plasma Enable Circuits.
When External E-Stop is satisfied, D21 LED on, relay K3, E-Stop CNC, is
closed applying +15VDC to K5’s coil.
HMI is an optional touch screen control panel. When not present, relay K6 on
the CCM I/O PCB is not energized connecting J7-1 to gnd. Gas Control’s Plasma
Enable Switch, when on (closed), applies gnd, through a relay in the Gas Control,
to K5’s coil. D2, E-Stop PS, will illuminate when both external E-Stop and
Plasma Enable are satisfied, K5 energized. K5’s contacts, when closed, enable
both the gas control and the power supply’s power circuits.
Quick Test
If D2 in the CCM is not illuminated to determine if problem is in CCM or
GCM 2000 or 2010 Gas Control (or cables & harness) first disconnect the HMI
cable, if present, then jumper J7-1 to J7-2 ( on CCM I/O PCB, the larger board).
If D2 comes on problem is in the Gas Control or the control cable. Otherwise it is
the CCM.
In the Gas Control if D25 (Plasma Enable LED on the main PCB) is
illuminated, jumper J5-6 to J5-7 (connector on main PCB). If D2 on the CCM
I/O PCB comes on now the GCM main board is defective. Otherwise problem is
In the GCM harness or the control cable.
If D25 (Plasma Enable LED) on the main PCB is not on, jumper J5-1 to J5-1
(connector on main PCB). If D25 still not on main PCB is defective. Otherwise
the Plasma Enable switch or its wiring to J5 is bad.