Installation
Emergency Mains Off
26
ONEAC CDR45I Series Power Conditioner, Installation Guide, 913-521 Rev. A
Emergency Mains Off
This feature will allow you to shut down your power conditioner by pushing the
red, mushroom-type EMERGENCY MAINS OFF (EMO) turn-to-release
button located on the front upper right corner.
After the EMO circuit has been deployed, the input circuit breaker will need to
be reset (switched to the OFF position, then the ON position) to resume normal
operation.
C A U T I O N
Hazardous voltages will still be present within the power conditioner even after
the EMO has been deployed.
You must turn off the power source supplying the power conditioner at the
service disconnect to remove all hazardous voltages before servicing or
working within the power conditioner. In order to comply with SEMI-S2-
93A; 11.2, which complies with 29 CFR 1910.147 (OSHA), the power feed
to the power conditioner must be locked out and tagged out at the service
disconnect that feeds the power conditioner input power block to de-
energize the power conditioner.
The EMO circuitry is integrated with the input circuit breaker with a 24 Vac
undervoltage release circuit and controlled by a 24 Vac transformer, which is
located in the control transformer area. The transformer is powered prior to the
input circuit breaker and is protected by two fuses (2 A, 600 V) on the primary
side located below the transformer and behind the middle front panel. The
secondary side of the transformer is fuse protected (1 A, 250 V) to limit the
current to 1 A maximum. This fuse is also located in the same compartment. A
schematic of the 24 Vac control circuit is found at the end of this section.
The conditioner 24Vac EMO circuit is forms a closed loop for normal
operation. The loop includes: the red EMO button (contacts open when button
depressed), a microswitch S2 behind lower front access panel (contacts closed
when switch is depressed by panel), and remote EMO contacts J1-3 and J1-J4
(a closed loop is required between these pins). When the EMO loop is closed,
24Vac is provided to the undervoltage coil of the input circuit breaker
permitting it to be set to ON Opening the loop by depressing the red button or
other interruption will cause the input circuit breaker to OPEN and remove
power from the conditioner load. Releasing the red EMO button (turn to
release) will restore 24 Vac to the undervoltage coil and permit the input circuit
breaker to be re-set to OFF then to ON.
Summary of Contents for CDR45I Series
Page 6: ...Safety Information 6 ONEAC CDR45I Series Power Conditioner Installation Guide 913 521 Rev A...
Page 10: ...List of Figures 10 ONEAC CDR45I Series Power Conditioner Installation Guide 913 521 Rev...
Page 40: ...Physical Views 40 ONEAC CDR45I Series Power Conditioner Installation Guide 913 521 Rev A...