2.6 Control and Alarm Relay Contact Information

Control relays

Table 2-7 lists the Control Relay contact information.

ATTENTION Control relays operate in the standard control mode; i.e., energized when output state is on.

Table 2-7 Control Relay Contact Information

Unit Power

Off

On

Control Relay

Wiring

N.O.

N.C.

N.O.

N.C.

Control Relay

Contact

Open

Closed

Open

Closed

Closed

Open

#1 or #2 Output Indicator Status

Off

Off

On

Off

On

Alarm relays

Table 2-8 lists the Alarm Relay contact information.

ATTENTION Alarm relays are designed to operate in a failsafe mode; i.e., de-energized during alarm state. This results in alarm actuation when power is OFF or when initially applied, until the unit completes self diagnostics. If the unit loses power, the alarms will function.

Table 2-8 Alarm Relay Contact Information

Unit

Power

Off

On

Alarm

Relay

Wiring

N.O.

N.C.

N.O.

N.C.

Variable NOT

in Alarm State

Relay

Indicators

Contact

 

 

 

Open

Off

Closed

 

 

 

Closed

Off

Open

 

 

 

Variable

in Alarm State

Relay

Indicators

Contact

 

 

 

Open

Off

Closed

 

 

 

Open

On

Closed

 

 

 

34

UDC 3300 Controller Product Manual

4/00

Page 46
Image 46
Honeywell UDC 3300 manual Control and Alarm Relay Contact Information, Lists the Control Relay contact information