Optidrive E3 Advanced Technical Manual Issue 05.Docx
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7
. Rat
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7
Rated Temperatures and De-rating curves
7.1
Thermal Management
The Optidrive E3 product range has an integrated Thermal Management function. This function allows the drive to automatically reduce the
drive output switching frequency when operating at higher heatsink temperatures to avoid the risk of an over temperature trip. The table
below shows the heatsink temperature threshold points at which thermal management occurs.
Temperature Threshold
Action
70
O
C
Auto reduce from 32kHz to 24kHz
75
O
C
Auto reduce from 24kHz to 16kHz
80
O
C
Auto reduce from 16kHz to 12kHz
85
O
C
Auto reduce from 12kHz to 8kHz
90
O
C
Auto reduce from 8kHz to 4kHz
97
O
C
Over temp trip
NOTE
The available range of switching frequencies is subject to the drive frame size, power rating and voltage rating. Refer to section 3.1 Available
Effective Switching Frequency Options for further information.
7.2
De-rating Curves Explained
The following graphs each show the maximum available continuous output current against the drive ambient temperature. Separate graphs
are shown for each frame size, supply voltage rating and enclosure type. In each graph the solid lines represent the performance of the drive
with the highest available output current capability in each case. Where units are available with a lower output current rating, these are shown
as dotted lines. Where the solid line is lower than the dotted line, the current limitation applies also to the lower output current rated drive at
the relevant effective switching frequency.
7.3
Derating Graphs
7.3.1
IP20, Three Phase Output Drives
7.3.1.1
Frame Size 1, IP20, 110-115V 1Phase Input, 230V 3 Phase Output (Voltage Doubler), 2.3A & 4.3A
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
10
20
30
40
50
60
Ou
tp
u
t
Cu
rr
e
m
t
(A)
Ambient Temperature (°C)
De-rating - vs Temperature
4kHz
8kHz
12kHz
16kHz
24kHz
32kHz
2.3A
