Chapter 1: Getting Started
Page 1–4
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
seleCTing The proper drive raTing (ConTinued)
insTallaTion alTiTude
AC drives rely on air flow for cooling. As the altitude increases, the air becomes less dense, and
this drop in air density decreases the cooling properties of the air. Therefore, the AC drive must be
oversized to compensate for the decrease in cooling. Most AC drives are designed to operate at
100% capacity at altitudes up to 1000 meters.
NOTE: For use above 1000m, the AC drive must be derated as described below.
deraTe ouTpuT CurrenT based on alTiTude above 1000 meTers
•
If the AC drive is installed at an altitude of 0~1000m, follow normal operation restrictions.
•
If installed at an altitude of 1000~3000m, decrease 1% of the rated current or lower 0.5°C of
temperature for every 100m increase in altitude.
•
Maximum altitude for Corner Grounded is 2000m.
GS4 Derating for Altitude
Rating (%) at Standard Ambient Temperature*
Altitude (m)
*Standard Ambient Temperature = 50°C for UL Open Type / IP20
*Standard Ambient Temperature =
40°C for UL Type 1 / IP 20 & UL Open Type / IP20 Side-by-Side
0 500 1500 25001000 2000 3000
100
90
80
70
60
50
40
50
45
40
40
35
30
T
a
at Rating = 100%
UL Open Type / IP20 Side-by-Side
UL Type 1 / IP20
UL Open Type / IP20
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