3.6 Parameters: 4-** Limits/Warnings
3.6.1 4-1* Motor Limits
Define torque, current and speed limits for the motor, and
the reaction of the Adjustable frequency drive when the
limits are exceeded.
A limit may generate a message on the display. A warning
will always generate a message on the display or on the
serial communication bus. A monitoring function may
initiate a warning or a trip, upon which the Adjustable
frequency drive will stop and generate an alarm message.
4-10 Motor Speed Direction
Option:
Function:
Select the motor speed direction(s) required.
Use this parameter to prevent unwanted
reversing. When
1-00 Configuration Mode
is
set to
Process
[3],
4-10 Motor Speed Direction
is
set to
Clockwise
[0] as default. The setting in
4-10 Motor Speed Direction
does not limit
options for setting
4-13 Motor Speed High
Limit [RPM]
.
[0]
*
Clockwise
The reference is set to CW rotation. Reversing
input (Default term 19) must be open.
[1]
Counter
clockwise
The reference is set to CCW rotation.
Reversing input (Default term 19) must be
closed. If reversing is required when ‘Reverse’
input is open, the motor direction can be
changed by
1-06 Clockwise Direction
[2]
Both
directions
Allows the motor to rotate in both directions.
NOTE!
This parameter cannot be adjusted while the motor is
running.
4-11 Motor Speed Low Limit [RPM]
Range:
Function:
Application dependent
*
[Application dependant]
4-12 Motor Speed Low Limit [Hz]
Range:
Function:
Application dependent
*
[Application dependant]
4-13 Motor Speed High Limit [RPM]
Range:
Function:
Application dependent
*
[Application dependant]
NOTE!
Max. output frequency cannot exceed 10% of the inverter
switching frequency (
14-01 Switching Frequency
).
4-14 Motor Speed High Limit [Hz]
Range:
Function:
Size related
*
[ par. 4-12 - par. 4-19 Hz]
NOTE!
Max. output frequency cannot exceed 10% of the inverter
switching frequency (
14-01 Switching Frequency
).
4-16 Torque Limit Motor Mode
Range:
Function:
Application dependent
*
[Application dependant]
NOTE!
Changing
4-16 Torque Limit Motor Mode
when
1-00 Configu-
ration Mode
is set to
Speed open-loop
[0],
1-66 Min. Current
at Low Speed
is automatically readjusted.
NOTE!
The torque limit reacts on the actual, non-filtrated torque,
including torque spikes. This is not the torque that is seen
from the LCP or the serial communication bus as that is
filtered.
4-17 Torque Limit Generator Mode
Range:
Function:
100.0 %
*
[Application dependant]
NOTE!
The torque limit reacts on the actual, non-filtrated torque,
including torque spikes. This is not the torque that is seen
from the LCP or the serial communication bus as that is
filtered.
4-18 Current Limit
Range:
Function:
Application dependent
*
[Application dependant]
NOTE!
If [20] is selected in
1-90 Motor Thermal Protection
,
4-18 Current Limit
current limit must be set to 150%.
4-19 Max Output Frequency
Range:
Function:
132.0
Hz
*
[1.0 -
1000.0 Hz]
Provides a final limit on the output
frequency for improved safety in
applications where you want to avoid
accidental overspeeding. This limit is
final in all configurations (independent
of the setting in
1-00 Configuration
Mode
).
Parameter Descriptions
FC 300 Programming Guide
3-44
MG33MD22 - VLT
®
is a registered Danfoss trademark
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