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24 QPAC User's Guide Appendix

Appendix

QPAC Troubleshooting

A technician can isolate a system problem by rst checking if the load is

good and the line voltage and temperature signals are present and correct. If

the above is true, then the power control may be the problem. The problem

may be with the QPAC's control card, transformer or power base. Use this

QPAC Troubleshooting Guide to assist with troubleshooting.

Symptom Probable Cause Corrective Action

No output Fuses blown Check and replace fuses

Incorrect input

wiring

See “Input Wiring,” Chapter 2.

Incorrect input

signal

Check temperature control output.

Input signal reversed See “Input Wiring,” Chapter 2.

Input signal not

adjusted

See “Bias and Gain Adjustment," Chapter 3.

Wrong or missing

control card

See “Input Wiring,” Chapter 2.

Transformer wiring Check transformer connections.

Missing load wiring See “Power and Load Wiring,” Chapter 2. The

SCR(s) will not function without a load.

Heatsink temperature

exceeded 86°C (187°F)

Clogged or non-

operational fan

Check fan, power, and clean if necessary. Check

for shorted thermostat, replace fan or ther-

mostat as necessary. #27-0005 thermostat is

normally open and closes on temperature rise.

Transformer hot Incorrect trans-

former

Check product and transformer labels.

Uncontrolled output

full on

Bad control card, or

bias and gain out of

adjustment

Unplug control card, try again. Readjust bias

and gain.

Bad transformer Unplug transformer wire and try again.

Bad power base If full on or half on output present with no

control card and no transformer, power base is

bad, replace it.

Unbalanced output

(QPAC-32 and QPAC-33)

Incorrect phase

rotation

See "Phase Rotation Adjustment," Chapter 3.

The QPAC Service Manual is available at http://www.watlow.com/downloads/

en/manuals/qpacse_a.pdf .

Troubleshoot

QPAC Troubleshooting

Guide.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 33 34

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