Actual signals and parameters
78
20 LIMITS
Drive operation limits.
20.01 MINIMUM SPEED Defines the allowed minimum speed.
WARNING! The limit is linked to the motor nominal speed
setting i.e. 99.08 MOTOR NOM SPEED. If 99.08 is changed,
the default speed limit will also change.
-18000 / (no. of pole pairs)
…MAXIMUM SPEED
Minimum speed limit 20000 =
11.05 EXT1
REF MAX
20.02 MAXIMUM SPEED Defines the allowed minimum speed.
WARNING! The limit is linked to the motor nominal speed
setting i.e. 99.08 MOTOR NOM SPEED. If 99.08 is changed,
the default speed limit will also change.
MINIMUM SPEED…18000
/ (no. of pole pairs)
Maximum speed limit 20000 =
11.05 EXT1
REF MAX
20.03 MAXIMUM CURRENT Defines the allowed maximum motor current.
0.0…x.xA Current limit 10 = 1 A
20.04 MAXIMUM TORQUE Defines the maximum torque limit for the drive.
0.0…600.0% Value of limit in percent of motor nominal torque. 100 = 1%
20.05 OVERVOLTAGE CTRL Activates or deactivates the overvoltage control of the intermediate
DC link.
Fast braking of a high inertia load causes the voltage to rise to the
overvoltage control limit. To prevent the DC voltage from exceeding
the limit, the overvoltage controller automatically decreases the
braking torque.
Note: If a braking chopper and resistor are connected to the drive, the
controller must be off (selection NO) to allow chopper operation.
OFF Overvoltage control deactivated. 0
ON Overvoltage control activated. 65535
20.06 UNDERVOLTAGE CTRL Activates or deactivates the undervoltage control of the intermediate
DC link.
If the DC voltage drops due to input power cut off, the undervoltage
controller will automatically decrease the motor speed in order to keep
the voltage above the lower limit. By decreasing the motor speed, the
inertia of the load will cause regeneration back into the drive, keeping
the DC link charged and preventing an undervoltage trip until the
motor coasts to stop. This will act as a power-loss ride-through
functionality in systems with a high inertia, such as a centrifuge or a
fan.
OFF Undervoltage control deactivated. 0
ON Undervoltage control activated. 65535
20.07 FREQUENCY MIN Defines the minimum limit for the drive output frequency.
Note: Visible only after entering proper code in 16.03 PASS CODE.
-300.00…FREQUENCY
MAX Hz
Minimum frequency limit.
Note: If the value is positive, the motor cannot be run in the reverse
direction.
100 = 1 Hz
20.08 FREQUENCY MAX Defines the maximum limit for the drive output frequency.
Note: Visible only after entering proper code in 16.03 PASS CODE.
No. Name/Value Description FbEq
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