INSTALLATION
10
ME00070B
TMS7 SERIES
4.4 Ventilation
When installing TMS7 starters in an enclosure there must be
sufficient air flow through the enclosure to limit heat rise within
the enclosure. Temperature within the enclosure must be kept
at, or below, the TMS7 maximum ambient temperature rating.
If installing an TMS7 within a totally sealed enclosure a bypass
contactor must be employed to eliminate heat dissipation from
the soft starter during run.
Soft starters dissipate approximately 4.5 watts per amp. The
table below shows air flow requirements for selected motor
currents. If other heat sources are installed in an enclosure
along with the TMS7 an additional air flow allowance must be
made for these items. Note that heat generation from
semiconductor fuses, if used, can be eliminated by installing
these within the bypass loop.
Required Airflow
m
3
/min
m
3
/hour
Motor
Amps
Heat
(watts)
5
o
C
Rise
10
o
C
Rise
5
o
C
Rise
10
o
C
Rise
10
45
0.5
0.2
30
15
20
90
0.9
0.5
54
27
30
135
1.4
0.7
84
42
40
180
1.8
0.9
108
54
50
225
2.3
1.1
138
69
75
338
3.4
1.7
204
102
100
450
4.5
2.3
270
135
125
563
5.6
2.8
336
168
150
675
6.8
3.4
408
204
175
788
7.9
3.9
474
237
200
900
9.0
4.5
540
270
250
1125
11.3
5.6
678
339
300
1350
13.5
6.8
810
405
350
1575
15.8
7.9
948
474
400
1800
18.0
9.0
1080
540
450
2025
20.3
10.1
1218
609
500
2250
22.5
11.3
1350
675
550
2475
24.8
12.4
1488
744
600
2700
27.0
13.5
1620
810
