2
Chapter
Installation and
Wiring
Before installing the controller, make a complete visual check of the controller for
damage in shipment or handling. Claims for damaged or missing parts must be
made to the carrier as soon as possible after receipt of shipment.
T
he open-style controller can be installed in an enclosure. The internal
temperature of the enclosure must be kept within the range of 0
°
C to 50
°
C.
For NEMA Type 1 enclosures, the following guidelines are recommended in order
to limit the maximum controller ambient temperature.
There should be a clearance of at least six inches above and below the controller.
This area allows air to flow through the heatsink. Ventilation openings are required
above and below this air space.
An outlet should be placed at least six inches above the controller. The inlet should
be placed near the bottom of the enclosure. It should be capable of accepting a fan
rated 110 CFM or greater. A filter is required to prevent contaminants from
entering the enclosure.
The minimum vent area should be ten square inches. For the 97 and 135 amp
controller, the minimum vent area should be 36 square inches. Deductions must be
made for the grill work or ventilation pattern.
CAUTION:
When thermal overload relays are installed in the same
enclosure, a barrier should be provided around the relay. However, this
should not inhibit air flow on forced air cooled units (97 and 135A).
!
The following table shows the maximum heat dissipation at rated current for the
controllers. For currents lower than rated value, heat dissipation will be lower.
Figure 2.1 - Maximum Heat Dissipation
SMC PLUS Controller Current
Size
24A
35A
54A
97A
135A
Maximum Watts
110
150
200
285
410
For NEMA Type 12 or non-ventilated enclosures, it is recommended that a by-pass
contactor be used. This will allow the controller to start the motor. Once up to full
voltage, the controller would be by-passed. Note that the energy saver and
protective features of the controller would no longer be available. See Page 2-5,
Figure 2.10 for this configuration.
The controller is convection cooled except for the 97A and 135A fan cooled unit. It
is important to locate the controller in a position which allows free air flow
vertically through the power module.
The controller must be mounted with
heatsink fins in a vertical plane and have a minimum of 6 inches free
space above and below the controller.
See Figure 2.2.
Inspection
Enclosures
Ventilated Enclosures
Non-ventilated
Enclosures
Mounting
Содержание Allen-Bradley SMC-PLUS Bulletin 150
Страница 2: ......