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10 Affinity User Guide
www.controltechniques.com Issue Number: 5
2.2 Drive types
There are three versions of Affinity drive available:
• Standard
• IP54 (NEMA12)
• IP66 (NEMA12)
The IP54 and IP66 drives are identified by additional characters at the end of the model number, i.e. E12/E54 or E12/E66. The standard drive has no
additional characters.
The standard drives are rated to IP20/NEMA1. Drive sizes 1 and 3 conform to UL Type 1 and sizes 4 to 6 are Open Class. If the optional conduit box
(refer to section 3.5 Mounting methods on page 31) is installed, then drive sizes 4 to 6 conform to UL Type 1.
The E12/E54 and E12/E66 drives have an additional cover installed. They are rated to IP54/NEMA12 and IP66/NEMA12 respectively and both
conform to UL Type 12. E12/E54 and E12/E66 drive sizes 1 to 3 have an internal fan installed to re-circulate the air. The larger drive sizes have fans
installed to the cover to provide forced ventilation using filtered air.
2.3 Ratings
Self ventilated (TENV/TEFC) induction motors require increased protection against overload due to the reduced cooling effect of the fan at low speed.
To provide the correct level of protection the I
2
t software operates at a level which is speed dependent. This is illustrated in the graph below.
The protection starts when the motor speed is below 50% of base speed.
Operation of motor I
2
t protection (It.AC trip)
Motor I
2
t protection is fixed as shown below and is compatible with:
• Self ventilated (TENV/TEFC) induction motors
Motor total
current (Pr 4.01)
as a percentage
of motor rated
current
Motor speed as a
percentage of base speed
100%
Max. permissible
continuous
current
100%
I t protection operates in this region
2
70%
50%15%
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