TRAC radio design RD300 PDU, Installation And Operational Manual

Page: 5 / 16

a TRAC company
99-438 Issue 05 Page 5 of 16
Remote Alarm Interface [RAI]
The PDU provides a VOLT-Free Alarm interface.
Table 1 ALARM Relay
PDU State COM –N/O COM –N/C
PDU OFF Open circuit Short Circuit
PDU ON - Alarm Open circuit Short Circuit
PDU ON - No Alarms Short Circuit Open circuit
N/O = normally open contact
N/C = normally closed contact
N/O
N/C
COM
R
AI
3
2
1
RD307 [ PDU ALARM cable ]
PDU
ALARM Relay shown in
the “alarm” state
The correct choice of connections [COM and N/O] or [COM and N/C] will
depend upon the alarm sense required.