Example: using a current transformer, Digital output 5 - 6 – Watlow EZ-ZONE PM Integrated Controller User Manual

Page 31

Watlow EZ-ZONE

PM Integrated Controller

•

Chapter 2 Install and Wire

Warning:

Óç

Use National Electric (NEC) or other

country-specific standard wiring and

safety practices when wiring and

connecting this controller to a power

source and to electrical sensors or

peripheral devices. Failure to do so

may result in damage to equipment

and property, and/or injury or loss
of life.

Note:

Maximum wire size termination and

torque rating:

• 0.0507 to 3.30 mm

(30 to 12

AWG) single-wire termination or

two 1.31 mm

(16 AWG)

• 0.8 Nm (7.0 lb.-in.) torque

Note:

Adjacent terminals may be labeled

differently, depending on the model

number.

Note:

To prevent damage to the control-

ler, do not connect wires to unused
terminals.

Note:

Maintain electrical isolation between

analog input 1, digital input-outputs,

switched dc/open collector outputs

and process outputs to prevent
ground loops.

Note:

The control output common termi-

nal and the digital common terminal

are referenced to different voltages

and must remain isolated.

Note:

This Equipment is suitable for use in

CLASS I, DIVISION 2, Groups A, B,

C and D or Non-Hazardous locations
only. Temperature Code T4A

Warning:

Explosion Hazard - Dry contact clo-

sure Digital Inputs shall not be used

in Class I Division 2 Hazardous Loca-

tions unless switch used is approved
for this application.

Warning:

Explosion Hazard – Substitution of

component may impair suitability

for CLASS I, DIVISION 2.

Warning:

Explosion Hazard - Do not discon-

nect while the circuit is live or

unless the area is known to be free

of ignitable concentrations of flam-

mable substances.

Example: Using a Current Transformer

Controller

Output N

CT Input

Fuse

SSR

3A x 4

12A

48mA

12A x 4 = 48A

Turns around CT

CT Primary Current

CT Secondary Current

Total current

CT Ratio R = 1000:1

= I

T/R = 50mA

CSC = I

p(full scale)

= 50mA(R)/T

CSI = Output N

= Current in secondary of current transformer

= Current in primary of current transformer

T = Number of turns through the primary of the transformer
R = Number of turns in the secondary of the current

transformer (Turns ratio, assuming one primary turn)

CSC = Current Scaling (parameter found in Current Menu

of Setup Page)

CSI = Current Source Instance (parameter found in Current

Menu of Setup Page)

Digital Output 5 - 6

common

switched dc

98
99

CD
CE

B5
D6
D5

Slot C

Digital Output
• Update rate 10 Hz
• Output voltage 24V
• Current limit, Output 5, 24

mA maximum

• Current limit, Output 6,

10 mA maximum driving

single pole DIN-A-MITE

• *Capable of driving a 3-pole

DIN-A-MITE

• Open-circuit voltage 22 to

32VÎ (dc)

PM _ _ [2,4] _ _-_ _ _ _ _ _ _

* Output 5 only

VDC

switched dc outputs

Internal Circuitry

Quencharc Note:

Switching pilot duty inductive loads

(relay coils, solenoids, etc.) with the

mechanical relay, solid state relay or

open collector output options requires

use of an R.C. suppressor.