Danfoss VLT AutomationDrive FC 300 Series, Руководство по программированию, Страница: 47 / 211

when using the precise stop function; it eliminates the task
time dependence and increases the accuracy substantially.
The frequency converter tolerance is normally given by its
task time. However, by using its special precise stop
function the tolerance is independent of the task time
because the stop signal immediately interrupts the
execution of the frequency converter program. The precise
stop function gives a highly reproducible delay from the
stop signal is given until the ramping down starts. A test
must be done to find this delay as it is a sum of sensor,
PLC, frequency converter and mechanical parts.
To ensure optimum accuracy there should be at least 10
cycles during ramping down, see
3-42 Ramp 1 Ramp Down
Time , 3-52 Ramp 2 Ramp down Time , 3-62 Ramp 3 Ramp
down Time and 3-72 Ramp 4 Ramp Down Time .
The Precise Stop Function is set up here and enabled from
DI T29 or T33.
NOTE
This parameter cannot be adjusted while the motor is
running.
1-84 Precise Stop Counter Value
Range: Function:
100000
*
[0 -
999999999 ] Enter the counter value to be used
in the integrated precise stop
function,
1-83 Precise Stop Function .
The maximum permissible
frequency at terminal 29 or 33 is
110 kHz.
Not used for selection [0] and [3] in
1-83 Precise Stop Function
1-85 Precise Stop Speed Compensation Delay
Range: Function:
10 ms
*
[0 - 100
ms] Enter the delay time for sensors, PLCs, etc.
for use in
1-83 Precise Stop Function . In
speed compensated stop mode, the delay
time at different frequencies has a major
influence on the stop function.
Not used for selection [0], [1] and [2] in
1-83 Precise Stop Function
3.3.9 1-9* Motor Temperature
1-90 Motor Thermal Protection
Option: Function:
Thermal motor protection can be
implemented using a range of techniques:
•
Via a PTC sensor in the motor
windings connected to one of the
1-90 Motor Thermal Protection
Option: Function:
analog or digital inputs
(
1-93 Thermistor Source ). See
3.3.10.1 PTC Thermistor Connection .
•
Via a KTY sensor in the motor
winding connected to an analog
input (
1-96 KTY Thermistor Resource ).
See 3.3.10.2 KTY Sensor Connection .
•
Via calculation (ETR = Electronic
Thermal Relay) of the thermal load,
based on the actual load and time.
The calculated thermal load is
compared with the rated motor
current I
M,N
and the rated motor
frequency f
M,N
. See 3.3.10.3 ETR and
3.3.10.4 ATEX ETR .
•
Via a mechanical thermal switch
(Klixon type). See
3.3.10.5 Klixon .
For the North American market: The ETR
functions provide class 20 motor overload
protection in accordance with NEC.
[0]
*
No
protection Continuously overloaded motor, when no
warning or trip of the frequency converter is
required.
[1] Thermistor
warning Activates a warning when the connected
thermistor or KTY-sensor in the motor reacts
in the event of motor over-temperature.
[2] Thermistor
trip Stops (trips) frequency converter when
connected thermistor or KTY sensor in the
motor reacts in the event of motor over-
temperature.
The thermistor cut-out value must be > 3
k
Ω
.
Integrate a thermistor (PTC sensor) in the
motor for winding protection.
[3] ETR warning
1 Calculates the load when set-up 1 is active
and activates a warning on the display when
the motor is overloaded. Programme a
warning signal via one of the digital outputs.
[4] ETR trip 1 Calculates the load when set-up 1 is active
and stops (trips) frequency converter when
the motor is overloaded. Programme a
warning signal via one of the digital outputs.
The signal appears in the event of a warning
and if the frequency converter trips (thermal
warning).
[5] ETR warning
2
[6] ETR trip 2
[7] ETR warning
3
Parameter Descriptions
VLT
®
AutomationDrive Programmming Guide
46 MG33ME02 - VLT
®
is a registered Danfoss trademark
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