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64 Unidrive SP Regen Installation Guide
www.controltechniques.com Issue Number: 2
5.6 Cubicle design and drive ambient
temperature
Drive derating is required for operation in high ambient temperatures
(derating information is provided in the Unidrive SP User Guide).
Totally enclosing or through panel mounting the drive in either a sealed
cabinet (no airflow) or in a well ventilated cabinet makes a significant
difference on drive cooling.
The chosen method affects the ambient temperature value (T
rate
) which
should be used for any necessary derating to ensure sufficient cooling
for the whole of the drive.
The ambient temperature for the four different combinations is defined
below:
1. Totally enclosed with no air flow (<2 m/s) over the drive
T
rate
= T
int
+ 5°C
2. Totally enclosed with air flow (>2 m/s) over the drive
T
rate
= T
int
3. Through panel mounted with no airflow (<2 m/s) over the drive
T
rate
= the greater of T
ext
+5°C, or T
int
4. Through panel mounted with air flow (>2 m/s) over the drive
T
rate
= the greater of T
ext
or T
int
Where:
T
ext
= Temperature outside the cabinet
T
int
= Temperature inside the cabinet
T
rate
= Temperature used to select current rating from tables in
Chapter 10 Technical data on page 183.
Regen inductors can produce significant losses with a normal
operating temperature in the region of 150°C dependant
upon the ambient temperature. Location of the regen
inductors should be considered to prevent damage to heat
sensitive components or create a fire risk.
CAUTION
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