Watlow Electric Micro-Based Autotuning Control SERIES 980/985 User Manual

Page 20

Figure 22 -

DC Output (Open

Collector), output 2
Option "C" Wiring

Diagram.

Figure 23 -

6 Amp Mechanical

Relay,

Output 2, Option "D"
Wiring Diagram.

Output 2 Option “C", DC Output (Open Collector)

Model# 98_A-

C 0-0000

- 8 Heat, Cool

or Alarm

Switched DC
Watlow’s solid state switch is a low current DC output (open collector) used to switch an
external power switching device such as a SSR or an electromechanical relay. The input
specifications of the power switching device must match those listed for the SS switch
output. The power switching device must provide isolation between the SS switch
output and load power since the SS switch output is a non-isolated output. Minimum

load resistance is 5 0 0 o h m s. Available current is 9mA minimum and 22mA maximum.

Output 2 Option “D”, 6 Amp Mechanical Relay

Model# 98_A-

D 0 - 0000

- -

Mechanical

Relay

Mechanical Relay

The electromechanical relay is an electrical and mechanical device with moving parts.

When power is applied to the relay solenoid, contact closure is created through move-

ment of the “common” contact of the relay. Off state impedance is 20K ohms minimum.

WATLOW Series 980/985 User’s Manual

InstaIl

and Wire, Chapter