Watlow QPAC User Manual download pdf (Page 21)

QPAC User's Guide 21Chapter 3: How to Operate

Operation

Chapter 3

How to Operate the QPAC

Setup Adjustments

After the QPAC is installed and wired it may need a few minor adjustments.

The three-phase power controls require proper phase rotation. QPACs that

use the BF, BV, AF or AL Control Cards may need minor bias and gain cali-

brations. QPACs that use the AL Phase Angle Current Limit Control Card will

need current limit calibration. Refer to the following paragraphs.

Phase Rotation Adjustment for Q32 and Q33

Three-phase QPAC SCR controllers require the correct phase sequence of

the attached line voltage. To check for proper phase sequence of the QPAC-

32 power control, measure the voltage from T1 to T2, T2 to T3 and T3 to T1

with the power control turned full on. If any of the measurements of output

voltage are not equal (within 10%), exchange any two of the power input lines

(L1 and L2) to the QPAC.

To check for proper phase sequence of the QPAC-33 power control, apply

power to the QPAC and observe the indicator lights in the upper left hand cor-

ner of the Power Base motherboard. If the phase rotation indicator light is not

illuminated, exchange any two incoming power lines (L1 and L2).

Bias And Gain Adjustments for AF, AL, BF, BV

Bias and gain can be adjusted to interface with the output of most standard

temperature controls with a proportional output. Bias and gain is factory set for

an input control signal of 4 to 20mA but can be adjusted over a range of 0 to

12VÎ (dc) or 0 to 25mA to match the output of a specic temperature control.

Input impedance for 4 to 20mA input is 250Ω. The input impedance can be

changed to 5KΩ to accept a voltage by performing the following procedure for

each card.

Voltage Input Conversions

(See Accessories in the Appendix for card part numbers.)

AF: For 5KΩ input, move J2 jumper, located on the lower left of the AF

card next to the TB-2 connector, Terminal 5. See the AL (Rev. B) Control

Card gure in this chapter.

AL: For 5KΩ input, replace the J2 jumper to the 5V position, located on

the lower left of the AL card. See the AF (Rev. H) Control Card gure in

this chapter.

BF: For 5KΩ input, remove resistor R3, located on the lower left of the

QBF card next to the TB-2 connector, Terminal 5. See the BF (Rev. D)

Control Card gure in this chapter.

BV: For 5KΩ input, remove the external resistor attached to the J3 con-

nector plug. See the BV (Rev. B) Control Card gure in this chapter.

Adjustment Procedure

We recommended that bias and gain adjustment be performed using a dum-

my load. In some applications, a dummy load may be required if the controlled

load can not be turned full on. A dummy load can be easily made by connect-

ing 150 watt lamps in series to match the operating voltage of the QPAC. Use

the following steps to make adjustments.

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Watlow QPAC User Manual Page 21

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