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WATLOW QPAC Service Manual 25

Troubleshooting, Chapter 5

Q33

The QPAC Transformer or Resistor Fuse (R10) is Bad

Check for AC voltage present at the transformer (T1), see Page 35 for trans-

former wiring. Be extremely careful! High voltage is present on the transformer

connections. If no voltage is present, verify that the resistor fuse is good by mea-

suring across R10. You should be able to visually determine whether or not the

fuse is bad. It should read a minimal voltage of < 1V. If it reads open circuit line

voltage, R10 is bad. See Page 5 for ordering a replacement transformer.

The QPAC Mother Board is Bad

Check the DC voltages at the J1 connector. Place the voltmeter common on pin

7 or 8. They should read as follows:

J1 Connector Label Without Card With BF, AF or AL

Test Point Card Installed

1 T STAT Not Used 3 to 5V

2 -V -11 to -14VDC -15 to -22VDC

3 FWZ* +5VDC Pulses +5VDC Pulses*

4 +V 15 to 18VDC 15 to 18VDC

5 Q32, connected to Pin 1

Q01 or Q33 Not Used Not Used

6 +5V 5V ±0.1V 5V ±0.1V

7 COM

8 COM (meter common)

9 KEY

10 COM

11 +LED Not Used Pulses possible

12 COM

*See scope picture on Page 15.

The Phase Loss LED is Not ON

Any one or a combination of phases are low (20% or greater). Measure the

incoming voltage on L1 and L2, L2 and L3, and L3 and L1.

Incorrect Phase Rotation (Phase Rotation LED is Not ON)

The phase rotation must be L1 - L2 - L3. Reverse any two “L” leads and try

again.

The Phase Lock Loop (PLL) is not synchronized with the AC Line

(PLL LED is Not ON)

There is probably noise on the AC line. Check the incoming power with a scope

and try a different power source.

The Zero Cross or Phase Angle Jumper is in the Wrong Location

Move the jumper. See the Zero Cross Calibration procedure on Page 15.

The Unit is Calibrated for the Wrong Frequency

The Zero Cross Calibration procedure must be performed at the operating fre-

quency (50 or 60Hz). See this procedure on Page 15.

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