Watlow QPAC User Manual download pdf (Page 17)

QPAC User's Guide 17Chapter 2: Install & Wire

Input Wiring

AL Control Card,Current

Transformer Selection.

Example of Current

Transformer (CT)

Connections One CT, 150

Amps and Above, 1Ø.

AL Card

16-0176

Transformer

Red

TB-3

TB-2

20mA

5A:20mA

T2T1

Load

Soft Start

(Available on the Phase Angle input cards AF and AL only.)

Some heater elements change resistance with temperature. Certain types,

such as tungsten, change resistance very fast (tungsten increases resis-

tance over 16 times from cold to hot). By slowly increasing the voltage to the

heater, the heater element is warmed to full resistance by the time full volt-

age is applied, thus reducing excessive surge currents. Soft start time on the

QPAC is about 6 seconds from power-up. If the QPAC is forced into emer-

gency shut down (ESD) the QPAC will restart soft. Soft start is only available

on phase angle models.

AL Control Card Current Transformer Connections

Phase Angle Current Limit Option

The AL Control Card is wired to a transformer from the load line of the

QPAC. The transformer is wired into pins 1 and 2 of connector TB3 of the AL

card. The following table and gures show the transformer connections for

different load congurations and currents.

Current Transformer

(Part Number)

Description Interstage

Transformer

Not Used 5A : 20mA Interstage Transformer 16-0176

16-0008 150A : 5A Current Transformer 16-0176

16-0045 200A : 5A Current Transformer 16-0176

16-0073 300A : 5A Current Transformer 16-0176

0004-0286-0400 400A : 5A Current Transformer 16-0176

0004-0286-0500 500A : 5A Current Transformer 16-0176

0004-0286-0600 600A : 6A Current Transformer 16-0176

0004-0287-0800 800A : 5A Current Transformer 16-0176

0004-0288-1000 1,000A : 5A Current Transformer 16-0176

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 33 34

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Watlow QPAC User Manual Page 17

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