Chapter 1: Getting Started
Page 1–5
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
seleCTing The proper drive raTing (ConTinued)
deTermine maximum enClosure inTernal TemperaTure
AC drives generate a significant amount of heat and will cause the internal temperature of an
enclosure to exceed the rating of the AC drive, even when the ambient temperature is less than
104°F (40°C). Enclosure ventilation and/or cooling may be required to maintain a maximum
internal temperature of 104°F (40°C) or less. Ambient temperature measurements/calculations
should be made for the maximum expected temperature. When permissible, flange mounting the
AC drive (mounting with the drive heatsink in open ambient air) can greatly reduce heating in the
enclosure.
For use above 104°F (40°C), the AC drive must be derated as described below.
deraTe ouTpuT CurrenT based on TemperaTure above 104°f (40°C)
Drive Derating by Temperature and Protection Level
Protection Level Derating
UL Type 1 / IP20 *
When the GS4 drive is operating at rated current, the ambient temperature has to be
between -10°C and +40°C. When ambient temperature exceeds 40°C, decrease the rated
current by 2% for every 1°C temperature increase. Maximum allowable temperature is 60°C.
UL Open Type
/ IP20 *
When the GS4 drive is operating at rated current, the ambient temperature has to be
between -10°C and +50°C. When ambient temperature exceeds 50°C, decrease the rated
current by 2% for every 1°C temperature increase. Maximum allowable temperature is 60°C.
* For more information about environmental ratings, refer to the “Operating Temperature and
Protection Level” table on page 1–9 of this chapter.
40%
50%
60%
70%
80%
90%
100%
30 35 40 45 50 55 60
UL Open-Type / IP20
UL TYPE1 / IP20
UL OPEN TY PE / IP20 side-by-side
Derating for
Ambient Temperature
Output Current Rating(A)
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