ab 1391-DES Series, User Manual

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Chapter 2
Specifications
2-2
Environmental Specifications
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).
Drive Power Dissipation
The 1391-DES dissipation characteristics are approximated in Table 2.A.
Table 2.A
Drive Power Dissipation
Rated Power Output
(%)
20
40
60
80
100
1391-DES15
(watts)
38
76
114
152
190
1391-DES22
(watts)
55
110
165
220
275
1391-DES45
(watts)
104
208
312
416
520
Transformer Power Dissipation
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
(%)
20
40
60
80
100
1.5kVA
(watts)
13
25
38
50
60
3.5kVA
(watts)
35
70
105
140
175
5.0kVA
(watts)
50
100
150
200
250
10.0kVA
(watts)
100
200
300
400
500
12.5kVA
(watts)
125
250
375
500
625
15.0kVA
(watts)
150
300
450
600
750
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).