Watlow Series PD Ethernet Enabled Temperature and Process Manuale Utente Scaricare il pdf (Pagina 12)

Watlow Series PD ■ 10 ■ Chapter 2 Install and Wire

Warning:

Use National Electric (NEC) or

other country-specific standard

wiring and safety practices when

wiring and connecting this con-

troller to a power source and to

electrical sensors or peripheral

devices. Failure to do so may re-

sult in damage to equipment and

property, and/or injury or loss of

life.

Note: Current transformer (CT)

must be purchased separately.

Note: A current transformer input

cannot be associated with a

process output on Output 1 or 3.

Figure 10a — Digital input internal circuit

Dual Current Transformer (CT) Inputs

PD_ 3-_ _ _ _-_ _ _

• Input impedance 100Ω, Vac only.

The current transformer (CT) must be purchased separately. Watlow CT

part number is 16-0246 (up to 50 amps).

Systems that are more than 50 amps need an interstage transformer. For

example, if you use a 300 amp CT, part number 16-0073, and an interstage

transformer, part number 16-0176, the 300 amp CT provides a 5 amp signal

to the interstage transformer. In turn, the interstage transformer provides a

20 mA maximum signal to the controller.

Figure 10b — Single Phase

1 2 3 4

CT Common

CT Input 1

CT Input 2

Load wire

Center leg not used

To CT Input 1 or 2

To CT Common

AC Load

CT Input 1 or 2

CT Common

0 to 5A

0 to

20mA

Single phase current sensing up to 300 amp

16-0176

Transformer

Digital Input 2 (3)

Digital Input Common (1)

Internal Circuitry

Digital Input 1 (2)

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 29 30

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Watlow Series PD Ethernet Enabled Temperature and Process Manuale Utente Pagina 12

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