Advertisement
Chapter 2
Specifications
Environmental Specifications
Drive Power Dissipation
Transformer Power Dissipation
2-2
The 1391-DES must be mounted in an enclosure that is clean, dry and
ventilated by filtered or cooled air. Enclosures vented with ambient air
must have appropriate filtering to protect against contamination caused by
oils, coolants, dust, condensation etc. The ambient air temperature must be
kept between 0 to 60 C (32 to 140 F) and the humidity between 5 and
95%, non-condensing.
The 1391-DES is equipped with an integral cooling fan. The general flow
of air through the unit must be maintained by following the recommended
spacing guidelines found in Chapter 7. The 1391-DES can operate at
elevations to 3300 feet (1000 meters) without derating, however, the
current rating must be derated by 3% for each additional 1000 feet (305
meters) up to 10,000 feet (3050 meters). Consult with your local
Allen-Bradley Sales Representative prior to operation over 10,000 feet
(3050 meters).
The 1391-DES dissipation characteristics are approximated in Table 2.A.
Table 2.A
Drive Power Dissipation
Rated Power Output
1391-DES15
(%)
(watts)
20
38
40
76
60
114
80
152
100
190
The power dissipation characteristics of the 1391 Isolation Transformer are
shown in Table 2.B.
Table 2.B
1391 Isolation Transformer Power Dissipation
Rated Power Output
1.5kVA
(%)
(watts)
20
13
40
25
60
38
80
50
100
60
Important: Power Dissipation figures shown are for use in calculating
cumulative system heat dissipation to ensure ambient temperature inside
enclosure does not exceed 60 C (140 F).
1391-DES22
(watts)
55
110
165
220
275
3.5kVA
5.0kVA
10.0kVA
(watts)
(watts)
(watts)
35
50
100
70
100
200
105
150
300
140
200
400
175
250
500
1391-DES45
(watts)
104
208
312
416
520
12.5kVA
15.0kVA
(watts)
(watts)
125
150
250
300
375
450
500
600
625
750
Advertisement
