Control And Alarm Relay Contact Information; Table 2-2 Control Relay Contact Information; Table 2-3 Alarm Relay Contact Information - Honeywell UDC2500 Product Manual

Installation

2.4 Control and Alarm Relay Contact Information

Control Relays
ATTENTION
Control relays operate in the standard control mode (that is, energized when output state is on).
Unit Power
Off
On
Alarm Relays
ATTENTION
Alarm relays are designed to operate in a failsafe mode (that is, de-energized during alarm
sate). This results in alarm actuation when power is OFF or when initially applied, until the unit
completes self diagnostics. If power is lost to the unit, the alarms will de-energize and thus the
alarm contacts will close.
Unit
Power
Off
On
14

Table 2-2 Control Relay Contact Information

Control Relay
Wiring
N.O.
N.C.
N.O.
N.C.

Table 2-3 Alarm Relay Contact Information

Alarm Relay Variable NOT in Alarm State
Wiring
Relay
Contact
N.O. Open
N.C. Closed
N.O. Closed
N.C. Open
UDC2500 Universal Digital Controller Product Manual
Control Relay
Contact
Open
Closed
Open
Closed
Closed
Open
Variable in Alarm State
Indicators Relay
Contact
Off Open
Closed
Open
Off
Closed
Output #1 or #2
Indicator Status
Off
Off
On
Off
On
Indicators
Off
On
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