Control Techniques Commander SK2402 User Manual

Safety
Information
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Information
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Installation
Electrical
Installation
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Information
Commander SK Size 2 to 6 Getting Started Guide 9
Issue Number: 2 www.controltechniques.com
2 Product Information
2.1 Ratings
Commander SK sizes 2 to 6 are 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 following graph illustrates the difference between Normal Duty and
Heavy Duty with respect to continuous current rating and short term
overload limits.
Normal Duty Heavy Duty (default)
For applications which use self ventilated induction motors and require a
low overload capability (e.g. fans, pumps).
Self ventilated 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 speed at which the low speed protection takes effect can be
changed by the setting of Pr 4.25. The protection starts when the motor
speed is below 15% of base speed when Pr 4.25 = 0 (default) and below
50% when Pr 4.25 = 1.
See the Commander SK Advanced User Guide, Menu 4 for further
details.
For constant torque applications or applications which require a high
overload capability (e.g. cranes, hoists).
The thermal protection is set to protect force ventilated induction motors
by default.
N
If the application uses a self ventilated motor and increased thermal
protection is required for speeds below 50% base speed, then this can
be enabled by setting Pr 4.25 = 1
See the Commander SK Advanced User Guide, Menu 4 for further
details.
Operation of motor I
2
t protection (It.AC trip) 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 induction motors
Motor I
2
t protection defaults to be compatible with:
• Forced ventilation induction motors
A
va
il
a
bl
e output
current
Overload limit -
Heavy Duty
Maximum
continuous
current (above
50% base
speed) -
Normal Duty
Maximum
continuous
current -
Heavy Duty
Motor rate
d
current set
in the drive
Heavy Duty
- with high
overload capability
Normal Duty
Overload limit -
Normal Duty
NOTE
NOTE
Motor total
current (Pr 4.01)
as a percentage
of motor rated
current
Motor speed as a
percentage of base spee
d
100%
Max. permissible
continuous
current
100%
I t protection operates in this region
2
70%
50%15%
Pr = 0
Pr = 1
4.25
4.25
Motor total
current (Pr 4.01)
as a percentage
of motor rated
current
Motor speed as a
percentage of base spee
d
100%
Max. permissible
continuous
current
100%
I t protection operates in this region
2
70%
50%
Pr = 0
Pr = 1
4.25
4.25

Control Techniques Commander SK2402 Specifications

General

Brand	Control Techniques
Model	Commander SK2402
Category	Controller
Language	English