Troubleshooting
SCZF1 SSR Power Controller
12
Ametek HDR Power Systems
Rev 2
4.6
Correcting Troubles in the SCZF1 Itself
Table 4.1 provides a comprehensive guide for troubleshooting the SCZF1.
Table 4.1 Troubleshooting Chart (Symptoms and Solutions)
Cause Solution
No output even with manual control (Zero) turned full CW.
(1a) Open SCR fuse
Disconnect power and check the fuse. If it has opened, replace it after
completing (b)
(1b) SCRs not firing
Install a good fuse in the circuit, and apply power to the SCZF1. If the output is
fully controllable using the manual control, then resume normal operation. If the
power output is still zero, contact Ametek HDR Power Systems service.
Maximum power at all times regardless of control setting.
(2a) All SCR networks
shorted
Disconnect power and check the front-to-back SCR pairs by measuring
resistance between terminals LINE (of the SSR) and LOAD. On the Rx1 scale,
the resistance should be infinite in both directions. If a shorted component is
indicated in any of these cases, replace it.
(2b) Firing control
section defective
Return the power to the unit. If the problem persists, contact Ametek HDR
Power Systems service.
Output is variable but can’t be brought to zero with ZERO control
(3a) SCR network
shorted
Check SSR network per solution 2a.
(3b) Firing control
section defective
Contact Ametek HDR Power Systems service for assistance
Output is variable but can’t be brought to maximum with SPAN control
(4a) Firing control
section defective
Contact service for assistance
