Danfoss VLT Midi Drive FC 280 Programming Manual page 41

Parameter Descriptions
1-83 Precise Stop Function
Option: Function:
defined in parameter 1-84 Precise Stop
Counter Value, which has been received at
terminal 29 or terminal 33. This is a direct
feedback with one-way closed-loop control.
The counter function is activated (starts
timing) at the edge of the start signal
(when it changes from stop to start). After
each precise stop, the number of pulses
counted during ramp down to 0 RPM is
reset.
[2] Counter stop Same as [1] Counter stop with reset, but the
without reset number of pulses counted during ramp
down to 0 RPM is deducted from the
counter value entered in
parameter 1-84 Precise Stop Counter Value.
This reset function can be used to
compensate for the extra distance done
during ramping down, and to reduce the
impacts of gradual wear of mechanical
parts.
[3] Speed Stop at precisely the same point, regardless
compensated of the present speed. The stop signal is
stop delayed internally when the present speed
is lower than the maximum speed (set in
parameter 4-19 Max Output Frequency). The
delay is calculated on the basis of the
reference speed of the frequency converter
and not based on the actual speed. Make
sure that the frequency converter has
ramped up before activating the speed
compensated stop.
[4] Speed Same as [3] Speed compensated stop, but
compensated after each precise stop, the number of
counter stop pulses counted during ramp down to 0 RPM
with reset is reset.
[5] Speed Same as [3] Speed compensated stop, but the
compensated number of pulses counted during ramp
counter stop down to 0 RPM is deducted from the
without reset counter value entered in
parameter 1-84 Precise Stop Counter Value.
This reset function can be used to
compensate for the extra distance done
during ramping down and to reduce the
impacts of gradual wear of mechanical
parts.
1-84 Precise Stop Counter Value
Range: Function:
100000 [0 - Enter the counter value to be used in
*
999999999 ] the integrated precise stop function in
parameter 1-83 Precise Stop Function.
The maximum permissible frequency at
terminal 29 or 33 is 32 kHz.
MG07C302
Programming Guide
1-85 Precise Stop Speed Compensation Delay
Range:
10 ms
*
1-88 AC Brake Gain
Range:
1.4 [1.0 -
*
2.0 ]
1-90 Motor Thermal Protection
Option:
[0] No protection
*
[1] Thermistor
warning
[2] Thermistor
trip
[3] ETR warning 1 Calculates the load and activates a warning
[4] ETR trip 1
Danfoss A/S © 07/2016 All rights reserved.
Function:
[0 - 100 Enter the delay time for sensors, PLCs, and so
ms] on for use in parameter 1-83 Precise Stop
Function. In speed-compensated stop mode,
the delay time at different frequencies has a
major influence on the stop function.
Function:
This parameter is used to set AC brake power
capability (set ramp-down time when inertia is
constant). In the condition that the DC-link voltage
is not higher than DC-link voltage trip value, the
generator torque can be adjusted with this
parameter. The higher AC brake gain is, the
stronger the brake capability is. It equals to 1.0
means that there is no AC brake capability.
NOTICE
If there is continuous generator torque,
higher generator torque causes higher
motor current, and the motor becomes hot.
In this condition, the parameter 2-16 AC
Brake, Max current can be used to protect
the motor from overheating.
Function:
Continuously overloaded motor, when no
warning or trip of the frequency converter
is required.
Activates a warning when the connected
thermistor in the motor reacts on a motor
overtemperature.
Stops (trips) the frequency converter when
the connected thermistor in the motor
reacts on a motor overtemperature.
The thermistor cutout value must be >3
kΩ.
Integrate a thermistor (PTC sensor) in the
motor for winding protection.
in the display when the motor is
overloaded. Program a warning signal via 1
of the digital outputs.
Calculates the load and stops (trips) the
frequency converter when the motor is
overloaded. Program a warning signal via 1
of the digital outputs. The signal appears in
the event of a warning and if the
frequency converter trips (thermal
warning).
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