Watlow Series 96 Manual de usuario descargar pdf (Pagina 7)

Chapter Three

Wiring

Input-to-Output Isolation

Figure 3.1a Isolation blocks.

Power Wiring

100 to 240VÅ (ac), nominal (85 to 264 actual) 96 A _ - _ _ _ _ - _ _ _ _

24 to 28V‡ (ac/dc), nominal (21 to 30 actual) 96 B _ - _ _ _ _ - _ _ _ _

Figure 3.1b Power wiring.

Sensor Installation Guidelines

Thermocouple inputs: Extension wire for thermocouples must be of the same

alloy as the thermocouple to limit errors.

When using a process signal (4-20mA, 0-5VÎ [dc], etc.) for the remote set point

or a voltage input for the digital input 2, use an ungrounded or isolated

thermocouple. If a grounded thermocouple is required, the signal to input 2 must

be isolated to prevent possible ground loops.

RTD input: Each 1Ω of lead wire resistance can cause a +2°F error when using

a two-wire RTD. A three-wire RTD sensor overcomes this problem. All three

wires must have the same electrical resistance (i.e., same gauge, same length,

multi-stranded or solid, same metal).

Process input: Isolation must be maintained between input 1 and input 2. If

both input 1 and input 2 are process signals, a separate power supply and

transmitter must be used for each input. These inputs must be electrically

isolated from one another to prevent ground loops.

Fuse

13 14 15

16 17 18

19 20 21

Isolation Blocks

There are no electrical connections between these blocks.

Output 1

Output 2

Output 3

Output 4 (unless Output 4

is used for communications)

Input 1

Input 2

Output 4 (if Output 4 is

used for communications)

Watlow Series 96 Wiring ■ 3.1

NOTE:

It is advisable to check

Output 1-4 hardware.

These outputs may differ

from those listed for the

model number on the

controller and described

in this manual,

indicating a customized

hardware setup.

CAUTION:

If high voltage is applied

to a low-voltage unit,

irreversible damage will

occur.

ç∫

WARNING:

To avoid damage to

property and equipment,

and/or injury of loss of

life, use National

Electric Code (NEC)

standard wiring practices

to install and operate the

Series 96. Failure to do

so could result in injury

or death.

CAUTION:

Maintain isolation

between input 1 and

input 2 to prevent a

ground loop. A ground

loop may cause incorrect

readings, dashes across

the upper display or the

display of error codes.

Failure to follow this

guideline could result in

damage to equipment

and product.

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Watlow Series 96 Manual de usuario Pagina 7

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