10
Unidrive M400 User Guide
Issue Number: 2
2.2 Ratings
The continuous current ratings given are for maximum 40
°
C (104
°
F), 1000 m altitude and 3.0 kHz switching. Derating is required for higher switching
frequencies, ambient temperature >40
°
C (104
°
F) and high altitude. For further information, refer to Chapter 12
The drive is single rated.
The rating is compatible with motors designed to IEC60034.
The graph on the right illustrates Heavy Duty with respect to continuous
current rating and short term overload limits.
Heavy Duty
For constant torque applications or applications which require a high overload capability, or full torque is required at low speeds (e.g. winders,
hoists).
The thermal protection is set to protect force ventilated induction motors by default.
N
If the application uses a self ventilated (TENV/TEFC) induction motor and increased thermal protection is required for speeds below 50 % base
speed, then this can be enabled by setting
Low Speed Thermal Protection Mode
(04.025) = 1.
Operation of motor I
2
t protection
Motor I
2
t protection is fixed as shown below and is compatible with:
•
Self ventilated (TENV/TEFC) induction motors
Motor I
2
t protection defaults to be compatible with:
•
Forced ventilation induction motors
Available output
current
Overload limit -
Heavy Duty
Maximum
continuous
current -
Heavy Duty
Motor rated
current set
in the drive
Heavy Duty
- with high
overload capability
NOTE
Motor total
current (Pr 04.001)
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%
Pr
=
0
Pr
=
1
04.025
04.025
Motor total
current (Pr 04.001)
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%
Pr
= 0
Pr
= 1
04.025
04.025
Summary of Contents for Unidrive M400
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