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Safety
Product
Mechanical
Information
Information
Installation
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
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
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 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.
2
Operation of motor I
t protection (It.AC trip)
2
Motor I
t protection is fixed as shown below and is compatible with:
•
Self ventilated induction motors
Motor total
current (Pr 4.01)
as a percentage
of motor rated
2
I t protection operates in this region
current
100%
70%
15%
50%
Commander SK Size 2 to 6 Getting Started Guide
Issue Number: 2
Electrical
Keypad and
Parameters
Installation
Display
2
t software operates at a level
Max. permissible
continuous
current
Pr
4.25
= 0
Pr
4.25
= 1
Motor speed as a
100%
percentage of base speed
www.controltechniques.com
Quick Start
Diagnostics
Commissioning
Available output
Overload limit -
current
Heavy Duty
Maximum
continuous
current (above
50% base
speed) -
Normal Duty
Maximum
continuous
current -
Heavy Duty
Heavy Duty - with high
overload capability
Heavy Duty (default)
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
NOTE
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.
2
Operation of motor I
t protection (It.AC trip)
2
Motor I
t protection defaults to be compatible with:
•
Forced ventilation induction motors
Motor total
current (Pr 4.01)
as a percentage
of motor rated
2
I t protection operates in this region
current
100%
70%
50%
UL Listing
Options
Parameter List
Information
Overload limit -
Normal Duty
Motor rated
current set
in the drive
Normal Duty
Max. permissible
continuous
current
Pr
4.25
= 0
Pr
4.25
= 1
Motor speed as a
100%
percentage of base speed
9
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Do you have a question about the Commander SK2202 and is the answer not in the manual?
Questions and answers
when we push the start button the motor cannot overcome the load on the belt. it started with a across the line starter. but of course, no control just run/stop
If the Control Techniques Commander SK2202 motor cannot overcome the load on the belt when the start button is pressed, possible issues include:
1. Low AC supply voltage – Insufficient voltage may prevent the motor from generating enough torque.
2. Low DC bus voltage – This can occur if supplied by an external DC source or during fast deceleration.
3. Mechanical load driving the motor – The load may be too heavy or moving in the opposite direction.
4. Drive requires autotuning – If the motor or its connections have changed, re-autotuning is needed.
5. Incorrect deceleration or ramp settings – Fast ramp times may not allow proper acceleration.
Check supply voltage, mechanical load, and ensure the drive is properly tuned to the motor.
This answer is automatically generated