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34 UDC 3300 Controller Product Manual 4/00
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 Control Relay
Wiring
Control Relay
Contact
#1 or #2 Output
Indicator Status
N.O. Open
Off
N.C. Closed
Off
N.O. Open
Closed
Off
On
On
N.C. Closed
Open
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
Variable NOT
in Alarm State
Variable
in Alarm StateUnit
Power
Alarm
Relay
Wiring
Relay
Contact
Indicators Relay
Contact
Indicators
N.O. Open Open
Off
N.C. Closed
Off
Closed
Off
N.O. Closed Open
On
N.C. Open
Off
Closed
On