Product Information; Ratings - Nidec Control Techniques Unidrive M Modular Installation Manual

Safety information
3

Product information

3.1

Ratings

The drive is dual rated.
The setting of the motor rated current determines which rating applies -
Heavy Duty or Normal Duty.
The two ratings are compatible with motors designed to IEC60034.
The graph aside illustrates the difference between Normal Duty and
Heavy Duty with respect to continuous current rating and short term
overload limits.
Normal Duty
For applications which use Self ventilated (TENV/TEFC) induction
motors and require a low overload capability, and full torque at low
speeds is not required (e.g. fans, pumps).
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
operates at a level which is speed dependent. This is illustrated in the
graph below.
NOTE
The speed at which the low speed protection takes effect can be
changed by the setting of Low Speed Thermal Protection Mode
(04.025). The protection starts when the motor speed is below 15 % of
base speed when Pr 04.025 = 0 (default) and below 50 % when
Pr 04.025 = 1.
2
Operation of motor I t protection
2
Motor I t protection is fixed as shown below and is compatible with:
• Self ventilated (TENV/TEFC) induction motors
Motor total
current (Pr 04.001)
as a percentage
of motor rated
2
I t protection operates in this region
current
100%
70%
15% 50%
12
Introduction Product information
2
t software
Max. permissible
continuous
current
Pr
Pr
Motor speed as a
100%
percentage of base speed
System configuration
Available output
current
Maximum
continuous
current (above
50% base
speed) -
Normal Duty
Maximum
continuous
current -
Heavy Duty
Heavy Duty (default)
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
and permanent magnet servo motors by default.
N
NOTE
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.
2
Motor I t protection defaults to be compatible with:
• Forced ventilation induction motors
• Permanent magnet servo motors
Motor total
current (Pr 04.001)
as a percentage
of motor rated
current
100%
70%
04.025 = 0
04.025 = 1
Mechanical
Electrical Installation
Installation
Overload limit -
Heavy Duty
Overload limit -
Normal Duty
Heavy Duty - with high
Normal Duty
overload capability
I t protection operates in this region 2
Motor speed as a
50% 100%
percentage of base speed
Unidrive M Modular Installation Guide
Motor rated
current set
in the drive
Max. permissible
continuous
current
Pr 04.025 = 0
Pr 04.025 = 1
Issue Number: 2