Watlow EZ-ZONE ST User Manual download pdf (Page 22)

Ó

Warning:

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 elec-

trical sensors or peripheral

devices. Failure to do so may

result in damage to equip-

ment and property, and/or

injury or loss of life.

NOTE: To prevent ground

loops, isolation needs to be

maintained from input to out-

put when using switched DC

or analog process outputs.

CAUTION: Always mount the

controller with the heat-sink

fins aligned vertically.

NOTE: Terminals L4 and

A1 on the limit connector

are jumpered at the factory

to complete the contactor

circuit. Additional switches

may be wired in series to the

terminals.

Ó

WARNING: If high voltage is

applied to a low-voltage con-

troller, irreversible damage

will occur.

Watlow EZ-ZONE

®

ST • 20 • Chapter 2 Install and Wire

Digital Input 5 - 6

B5

D6

D5

DC Input

common

DC Input

Slot C

Digital Input

• Update rate 1 Hz

• Dry contact or dc voltage

DC Voltage

• Input not to exceed 36V at

3 mA

• Input active when > 3V @

0.25 mA

• Input inactive when < 2V

Dry Contact

• Input inactive when >

500 Ω

• Input active when < 100 Ω

• maximum short circuit 13

mA

ST [B, C, D or E] _- _ _ _ _-_

_ _ _

Voltage Input

B

common

Vdc

D

_

_

Dry Contact

B

common

24 Vdc

_

_

D

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 96 97

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