Operation - GE AKD-20 AR Installation And Maintenance Manual

AKD-20 AR / Entellisys AR Low-voltage Switchgear
Section 8. Operating the Switchgear

Operation

A three position Illuminated Fan Control Switch, Figure 8.17, is
provided to allow an operator to select the mode of operation
for the cooling fan system. The fan control switch is provided
with a pad-lockable hasp to allow an operator to lock-
out/tag-out the fan control switch. The three positions of the
fan control switch is "OFF", "ON" and "TEST". The "TEST"
position of the fan control switch is a momentary position.
OFF Operating Mode
With the Illuminated Fan Control Switch in the "OFF" position,
the 120Vac control power to the fan cooling system is not
available except for the line side of the Fan Control Power
Fuse and the Illuminated Fan Control Switch. All indicating
lights will be off. This operating mode may assist with an
operator trouble-shoot or perform maintenance on the fan
cooling system.
ON Operating Mode
With the Illuminated Fan Control Switch in the "ON" position,
the 120Vac control power to the fan cooling system is
available. The fan control switch itself will be illuminated and
the fan cooling system is ready to respond as necessary. This
is the normal operating mode for the fan cooling system.
If the current exceeds the values shown in Table 8.1 for 60
seconds, the amber Current Alarm Indicating Light will be
illuminated. The green Fan Relay On Indicating Light and
each red Fan On Indicating Light will be illuminated.
If the current drop below the values shown in Table 8.1 for 60
seconds, the amber Current Alarm Indicating Light, the green
Fan Relay On Indicating Light and each red Fan On Indicating
Light will be off.
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Courtesy of NationalSwitchgear.com
TEST Operating Mode
With the Illuminated Fan Control Switch held in the "TEST"
position, an operator can perform a functional test on the fan
cooling system without having to exceed the values shown in
Table 8.1.
While the Illuminated Fan Control Switch is held in the "TEST"
position, the following events will indicate a heathy fan
cooling system.
•
Amber Current Alarm Indicating Light illuminated
• Green Fan Relay On Indicating Light illuminated
• Each Red Fan On Indicating Light Illuminated
If the amber Current Alarm Indicating Light did not illuminate,
check to see if the 120Vac control power is available, the Fan
Control Power Fuse is not blown, or the indicating lamp is not
burned out.
If the green Fan Relay On Indicating Lamp did not illuminate,
check to see if the Fan Relay is operating properly.
If any of the red Fan On Indicating Lamps did not illuminate,
check to see if either the fan air flow monitor or the fan itself
has failed. Refer to DEH-41475 for instructions on how to
replace either a cooling fan or its air flow monitor.
NOTICE: Each cooling fan is provided with an air flow
monitor. The air flow monitor will only change state and
illuminate the red Fan On Indicating Light once the cooling
fan is energized and is operating at an acceptable air flow
rate.
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DEH-41473