Carrier 19XL - Manual (Page 241)

14. Restore chiller to normal operation, calibrate motor amps.
Solid-State Starters
Troubleshooting guides and information pertaining to the operation of the solid-state starter
may be found in Figure 46 , Figure 47 , Figure 48 , Figure 49 , Figure 50 , Figure 51 , Figure 52 ,
Table 12 , and Table 13 .
Attempt to solve the problem by using the following preliminary checks before consulting the
troubleshooting tables.
When the power is off:
• Inspect for physical damage and signs of arcing, overheating, etc.
• Is the wiring to the starter correct?
• Are all connections in the starter tight?
• Is the current feedback resistor properly adjusted and installed?
• Is a heater coil installed in each leg of the motor?
• Is the control transformer fuse blown?
• Is the motor connected to the starter?
Testing Silicon Control Rectifiers in Benshaw, Inc. Solid-State Starters
If a silicon control rectifier (SCR) is suspected of being defective, use the following procedure
as part of a general troubleshooting guide.