14-26 Trip Delay at Inverter Fault
Range:
Function:
Size
related
*
[ 0 - 35 s]
When the frequency converter
detects an overvoltage in the set
time, trip is effected after the set
time.
If value is 0, protection mode is
disabled.
NOTICE
Disable protection mode in
hoisting applications.
4.13.3 14-3* Current Limit Control
The frequency converter features an integral current limit
controller, which is activated when the motor current, and
thus the torque, is higher than the torque limits set in
parameter 4-16 Torque Limit Motor Mode
and
parameter 4-17 Torque Limit Generator Mode
When the current limit is reached during motor operation
or regenerative operation, the frequency converter tries to
reduce torque below the preset torque limits as quickly as
possible without losing control of the motor.
While the current control is active, the frequency converter
can only be stopped by setting a digital input to
[2] Coast
inverse
or
[3] Coast and reset inv.
Any signals on terminals
18–33 are not active until the frequency converter is no
longer near the current limit.
By using a digital input set to
[2] Coast inverse
or
[3] Coast
and reset inv.
, the motor does not use the ramp-down
time, since the frequency converter is coasted. If a quick
stop is necessary, use the mechanical brake control
function along with an external electro-mechanical brake
attached to the application.
14-30 Current Lim Ctrl, Proportional Gain
Range:
Function:
100 %
*
[0 - 500 %]
Enter the proportional gain value
for the current limit controller.
Selection of a high value makes the
controller react faster. Too high a
setting leads to controller
instability.
14-31 Current Lim Ctrl, Integration Time
Range:
Function:
Size
related
*
[0.002 - 2 s]
Controls the current limit control
integration time. Setting it to a
lower value makes it react faster. A
setting too low leads to controller
instability.
14-32 Current Lim Ctrl, Filter Time
Range:
Function:
Size
related
*
[1 - 100 ms]
Controls the current limit control
low-pass filter.
This makes it possible to react to
peak values or to average values.
When selecting average values, it is
sometimes possible to run with
higher output current and instead
trip on the hardware limit for
current. However, the control reacts
slower as it does not react on
immediate values.
4.13.4 14-4* Energy Optimizing
Parameters for adjusting the energy optimization level in
both variable torque (VT) and automatic energy optimi-
zation (AEO) mode in
parameter 1-03 Torque Characteristics
.
14-40 VT Level
Range:
Function:
66 %
*
[40 - 90 %]
NOTICE
This parameter cannot be
adjusted while the motor is
running.
NOTICE
This parameter is not active
when
parameter 1-10 Motor
Construction
is set to
[1] PM
non-salient SPM
.
Enter the level of motor magneti-
zation at low speed. Selection of a
low value reduces energy loss in
the motor but also reduces load
capability.
14-41 AEO Minimum Magnetisation
Range:
Function:
Size
related
*
[ 30 - 200 %]
NOTICE
This parameter is not active
when
parameter 1-10 Motor
Construction
is set to
[1] PM
non-salient SPM
.
Enter the minimum allowable
magnetization for AEO. Selection of
a low value reduces energy loss in
the motor but can also reduce
resistance to sudden load changes.
Parameter Descriptions
VLT® AutomationDrive FC 361
134
Danfoss A/S © 03/2019 All rights reserved.
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