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3PCI SCR Power Controller Series Manual
CHAPTER 5: TROUBLESHOOTING
In This Section:
•
Customer Service Program ................ 5-1
•
Troubleshooting Typical Symptoms.... 5-1
•
Static Precautions When Servicing..... 5-1
•
Environmental Problems..................... 5-2
•
Input Power and Load Connections.... 5-3
•
Correcting Specific 3PCI Problems .... 5-3
•
Replacement Fuses ............................ 5-4
•
Torque Specifications ......................... 5-4
5.1. Customer Service Program
Although service is seldom necessary, because of the inherent long-term reliability of solid-state components
and conservative design,
cooperative customer-service. If operational difficulties occur,
or units quickly, courteously and efficiently. If servicing problems arise that are not within the scope of the
following troubleshooting guide, service is readily available, as detailed Chapter 6: Service.
5.2. Troubleshooting Typical Symptoms
The 3PCI is considered to be operating properly when it's output voltage can be satisfactorily varied from 0%
to 100% of the available input voltage by a control signal. Improper operation of the unit is usually indicated
by one of the following symptoms:
1. No output.
2. Full output at all times, with no change resulting from a control signal change.
3. Output variable from some intermediate value to maximum, but cannot be brought to zero.
4. Output variable from zero to some intermediate value, but cannot be brought to maximum.
The symptoms listed may be caused by one or more of the following: an environmental problem, faulty
input-power or load connections, and the 3PCI itself. These possible causes should be investigated as
described in sections that follow.
The 3PCI should be tested and operated with an adequate load since an open output will have
line voltage at the load connections.
5.3. Static Precautions When Servicing
Servicing should be performed by qualified personnel only, following procedures described herein.
Caution - Electrical Hazard! Hazardous voltages exist at the exposed 3PCI heat sinks and at the
load unless the line-source fused disconnect or circuit breaker is open or off. This is true even when the
SCRs are turned off. Always remove power to the unit before attempting service.
If troubleshooting indicates a need to replace a component on a printed circuit board or possibly the entire
board, measures to prevent electrostatic discharge (ESD) damage must be taken.
Version 1.2 (19000325)
s
LD R emphasizes customer satisfaction by maintaining a rapid-response,
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Troubleshooting
s
LD R will provide replacement parts
5-1
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Table of Contents
Troubleshooting
