Chapter 1: Getting Started
1–4
Selecting the Proper Drive Rating (continued)
E. Calculate required output amperage
Use the chart below to calculate the required FLA of the AC drive, as shown by
the following examples. Select the rating that equals the motor’s voltage and
equals or exceeds the calculated amperage.
• Example 1 (GS1 or GS2 drive):
Motor FLA = 6A; Overload = 200% @ 45s; Altitude = 800m; MEIT = 45°C
• Example 2 (DURA
PULSE GS3 drive):
Motor FLA = 8A; Overload = 135% @ 75s; Altitude = 1100m; MEIT = 35°C
Calculating Required Drive Current
If Then Enter
Example 1
GS1 or GS2
Example 2
GS3
DURA
PULSE
Overload Derate (overload %)
If overload is < 150% and < 60 seconds 1
1.33 1.35If overload is > 150% and < 60 seconds (overload / 150)%
If overload is > 60 seconds (overload / 100)%
Overload Result Multiply FLA x overload entry 8.0 10.8
Altitude Derate (meters)
Altitude is < 1,000m 1
1 1.01
Altitude is > 1,000m and < 3,000m 1 + ((altitude - 1,000m) x 0.0001)
Altitude Result Multiply overload result x altitude entry 8.0 10.91
Ambient Temperature (°C)
Maximum enclosure internal
temperature (MEIT) is < 40°C
1
1 1
40°C < MEIT < 50° and
GS1/2 AC drive up to 5hp
1
40°C < MEIT < 50° and GS1/2
AC drive > 5hp or DURA
PULSE AC drive
1.2
Required Drive FLA Multiply altitude result x MEIT entry 8.0 10.91
DURAPULSE AC Drive User Manual
1st Ed. Rev. D 05/2013
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