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Easy-Start ES Instruction Manual
Pre-Installation
INSTALLATION
2-7
Application Considerations
Installation
1. Ventilated NEMA 1 enclosures should be
mounted so that enough clearance is
available for air to enter and exit the
enclosure. Specific clearance requirements
are shown on enclosure dimension drawings.
2. NEMA 12 enclosures should be mounted so
that heat sink fins are vertical. For wall
mounted units a minimum clearance of 6" on
top and bottom is required.
3. Open panel units should be mounted in a box
so the temperature inside the box does not
exceed 50¡C (122¡F).
For sizing the enclosure the heat loss in watts
can be estimated at 3 times the full load
current.
EXAMPLE:
For ES180-4N the maximum
current rating is 180 amps. The approximate
watts loss at maximum current rating is
3 x 180 = 540 watts.
For units with non isolated heat sinks, all the watt
loss must be dissipated thru box surface.
For units with isolated heat sinks; the heat sink
fins should be brought out in open air thru a
properly gasketed cut out in the enclosure.
Approximately 50% watt loss is dissipated thru
the heat sinks and the remaining 50% should be
dissipated thru the remainder of the box surface,
not counting the heat sink.
Ambient Temperature
Easy-Start ES is rated for 40¡C (104¡F) ambient
temperature. For above 40¡C derate by 5% for
every 5¡C rise over 40¡C up to 50¡C (122¡F)
max.
EXAMPLE:
ES180-4N is rated 180 Amps @
40¡C. For 50¡C the rating would be 180 x 0.9
= 162 Amps
Altitude
Easy-Start ES is rated for 3300 ft. [1000 meters].
Use Figure 2-5 for derating above 3300 ft.
Multi-Motor Operation
Easy-Start ES can be used to control multiple
motors if the following conditions are met:
The current rating of Easy-Start ES should be
equal to or greater than the total of individual
motor full load amps and DIP switches must
be set for the cumulative full load amps of the
motors.
Individual motor overcurrent protection is
provided by others.
Energy Saver circuit should be turned
OFF
.
The motors should not be mechanically
coupled together, i.e. two motors on same
shaft.
NEC and local code requirement for
individual motor protection and branch circuit
protection are met.
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