Test SCR Circuit
1.Test the SCR circuit in the on position:
a.Make sure everything is connected, including the hose.
b. Turn main power ON | . |
c.Adjust the hose heat setpoint above the ambi- ent hose temperature.
d.Turn on 
heat zone by pressing 
.
e.Hold down 
to view electrical current. Hose current should ramp up to 45A. If there is no hose current, see E03: No zone current, page 11. If hose current exceeds 45A, see E02: High zone current, page 11. If hose current stays several amps below 45A, hose is too long or voltage is too low.
2.Test the SCR circuit in the off position:
a.Make sure everything is connected, including the hose.
b. Turn main power ON | . |
c.Adjust the hose heat setpoint below the ambi- ent hose temperature.
d.Turn on 
heat zone by pressing 
.
Using a voltmeter, carefully measure the voltage at the hose connector. You should not get a voltage reading. If you do, the SCR on the temperature control module is bad. Replace the temperature control assembly.
Repair
Replacing Temperature Control Assembly Modules
NOTICE
Before handling assembly, put on static conductive wrist strap to protect against static discharge which can damage assembly. Follow instructions provided with wrist strap.
1. Turn main power off | . Disconnect power |
supply.
2.Relieve pressure, page 13.
3.Refer to electrical diagrams. See Reactor
4.Remove bolts that secure transformer assembly and slide assembly to side in cabinet.
5.Put on static conductive wrist strap.
6.Disconnect all cables and connectors from assem- bly. See Temperature Control Module, page 26.
7.Remove nuts and take entire temperature control assembly to workbench.
8.Replace defective module.
9.Install assembly in reverse order.
3A1570A | 27 |
