Rockwell Automation 1395 Digital DC Drive FRN 5-10.10/9.30 - Manual (Page 129)

Chapter 6
Installation
6-5
Cooling Airflow In order to maintain proper cooling, the drive must be mounted in a vertical
position (fuses in the upper right hand corner). Refer to Figures 6.1
through 6.3 for the recommended minimum clearance of each drive.
The drive design produces up to a 10
°
C or 18
°
F air temperature rise when
the drive is operated at full capacity. Precautions should be taken not to
exceed the maximum inlet ambient air temperature of 55
°
C (131
°
F). If the
drive is in an enclosed cabinet, air circulation fans or a closed circuit heat
exchanger may be required.
NEMA Type 12 Enclosures When the drive is mounted in a NEMA Type 12 nonventilated sheet metal
enclosure, the enclosure must be sized properly to allow adequate
convection cooling. The drive will dissipate a heat loss that is proportional
to the amount of armature current being delivered.
The following table lists the approximate wattage dissipation of each drive
based on its current rating.
Table 6.A
Drive Wattage Dissipation
Drive HP Rating
230VAC
1 - 5
7.5 - 15
20
25 - 30
40 - 50
60 - 75
100
125 - 200
250 - 300
460VAC
2 - 10
15 - 30
40
50 - 60
75 - 100
125 - 150
200
250 - 400
500 - 600
Watts Dissipated
100
225
295
485
675
905
1265
2722
3456
The NEMA Type 12 enclosure should be sized such that 10 watts of power
are dissipated for each 1 square foot of enclosure surface. This area should
not include the enclosure bottom or surfaces of the enclosure mounted
against a wall.
The heat loss for additional equipment that is mounted in the enclosure
should be added to the heat loss of the drive.
Wiring Clearance Although the minimum clearance should be maintained for proper cooling,
this space may not always provide proper wiring clearance. The minimum
allowable wire bending radius may necessitate that extra space be provided
to accommodate power wiring. Consult the governing code for the proper
wiring method.
Disconnect IMPORTANT: The user is responsible for completing the installation of
the drive system and to comply with all National and Local Electrical
Codes. The following information is to be used as a reference only.