Watlow QPAC Instrukcja Użytkownika Pobierz pdf (Strona 23)

QPAC User's Guide 23Chapter 3: How to Operate

Fixed Bias

Connector

Gain Pot

TB-1

08-5342

BV Fixed Bias Connector

& Gain Adjustment

cut resistor for volts input

Motherboard Connector

Current Limit Pot

(AL Card only)

Bias Pot

Gain Pot

08-5411

TB-2

TB-1

4 to 20mA

AL Bias, Gain, & Current Limit

Adjustments

move jumper for mA

or volts dc input

Bias and Gain

Current Limit Adjustments

(AL Card only)

The AL Control Card is a phase angle control with the capability to limit the

maximum current to the load. A potentiometer on the AL adjusts the current

limit setting. See the AL (Rev. B) Control Card gure above. Use the follow-

ing steps to adjust the current limit on initial setup. The purpose of the proce-

dure is to bring the power to the load up slowly so that the maximum current

to the load is not exceeded before the current limit is adjusted.

Note: A short overcurrent through the load may occur, as the AL Card

circuitry detects the higher current, if the input signal from the temperature

control is abruptly increased.

1. Attach a clamp-on ammeter to the load line.

2. Adjust the AL card current limit potentiometer fully counterclockwise (for

minimum current ow).

3. Turn the temperature control on and adjust the input signal to the control

card for zero percent power.

4. Turn the power to the QPAC on.

5. Gradually increase the input signal.

6. Adjust the current limit potentiometer clockwise until current to the load

is measureable.

7. Gradually increase the input signal to 100% power, then adjust the cur-

rent limit potentiometer to obtain the desired maximum current to the

load.

NOTE:

The AL Current Limit

must be disabled (pot

fully clockwise - CW)

before bias and gain can

be adjusted.

AL (Rev. B) Control Card.

BV (Rev. B) Control Card.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 33 34

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