Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
4.15 USING THE ALARM CUT-OFF SWITCH
The IMUX 2000 M-DACS Alarm Cut-Off (ACO) switch is located on the power supply module
(Figure 4-5). When the ACO switch is in the EN position, the main shelf ALARM and ALERT relays
located on the Power Supply Alarm I/O module will respond to detected alarm and alert conditions.
However, when the ACO switch is in the DIS position, these relays are disabled. That is, they are
forced into their normal (non-alarm) state. (See Table 4-10.)
The ACO switch on an IMUX 2000 M-DACS multiplexer may be used to silence a local alarm once
this multiplexer has been identified as the source of the alarm. After the alarm or alert producing
condition has been fixed, be sure to return the ACO switch to its EN position to re-enable the ALARM
and ALERT relays.
NOTE
In multiplexers equipped with two power supplies, both ACO switches must be placed
in the DIS position to disable the ALARM and ALERT relays located on the Power
Supply Alarm I/O module
M-DACS-T1 RFL Electronics Inc.
ACO
SWITCH
Figure 4-5. Location of the alarm cut-off (ACO) switch on the Power Supply module
Ta
ble 4-11. Using the ACO switch
Switch
Position
Description
The ALARM and ALERT relays located on the Power Supply Alarm I/O module are enabled. If an
EN
alarm or alert condition is detected, they will change
position accordingly.
Whe
n the condition
ceases, the relays will return to normal.
DIS The ALARM and ALERT relays located on the Power Supply Alarm I/O module are disabled. They
will stay in their normal positions, even if an alert or alarm condition occurs.
If the shelf is equipped with a second (redundant) power supply, the ACO switches on
BOTH
power supplies must be in the DIS position to disable the ALARM and ALERT relays.
July 18, 2008 4-26 (973) 334-3100
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