Cooling Fan Control Module - GE ABB ReliaGear LV SG Installation, Operation And Maintenance Manual

R E L I A G E A R ® LV S G LO W V O LTA G E S W I TC H G E A R
51

Cooling fan control module

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General
84
ReliaGear LV SG may be provided with a front-
Front-mounted
auxiliary ventilation
mounted auxiliary ventilation compartment for
compartment
5000A applications, Figure 84.
The SACE EMAX 2 circuit breaker compartment is
provided with an integrally mounted cooling fan
system. The cooling fan system, when provided,
is contained within a dedicated front-mounted
auxiliary ventilation compartment below the circuit
breaker. The dedicated front-mounted auxiliary
ventilated compartment is constructed with
grounded metal barriers on all sides resulting in a
segregated compartment compartment thus
protecting operators from gases which may be
vented by the breaker during circuit interruption.
When a front-mounted auxiliary ventilation
compartment contains a fan cooling system, the
instrument tray directly above the front-mounted
ventilation compartment will be provided with the
components shown in Figure 85.
In ReliaGear LV SG 5000A applications, the fan
control is initiated by the "Alarm Warning lw1"
feature of the trip unit which signals a fan control
circuit to turn the fans on or off. Refer to Figure 86
for a typical fan cooling circuit diagram.
The fan control circuit requires 120Vac control
power, which is normally provided by the
switchgear control power transformer, and a 24Vdc
DANGER
power supply. The power requirements for each fan
is 0.7 amps @ 24Vdc (5 fans installed).
WARNING
Remote monitoring of the fan control circuit is
CAUTION
optionally available.
Notice: Variations of the fan control circuit may be
NOTICE
provided. Operators should review and understand
the As-built documents provided with the
equipment from the factory to confirm final fan
control circuitry.
Table 8 provides the current threshold values that
EKIP Touch or Hi-Touch trip unit's "Alarm Warning
lw1" function should be programmed to initiate
the fan cooling system.
Refer the Cooling Fan Installation and Trip Unit
Programming Guide 1VAL106902-TG for more
information.
Load reduction contacts are provided within the
equipment section. These contacts are provided
for customer connections as required by CSA C22.2
No 31-18 in the event of a cooling fan failure.
Operation of the switchgear, for an extended
period, above the threshold limits shown in Table 8
without a properly working fan cooling system will
not create an unsafe condition but is not
recommended.
Table 8 - Current alarm 1 settings for cooling fan
system
DANGER
Circuit Section
WARNING
breaker width
E6.2 38
CAUTION
Notice: The circuit breaker(s)
NOTICE
referenced in Table 8 must be
configured with the "Alarm Warning
lw1"" trip unit option and this
function must be set per Table 8 for
proper operation of the fan cooling
system.
1
2
3
1. SACE EMAX2 E6.2 circuit breaker
2. Instrument tray panel
3. Front-mounted auxiliary ventilation
compartment
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84
Alarm
Current
warning IW1
threshold
(A)
Up set point
4400
0.88