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100% corresponds to 50% reduction of U/F
ratio. Default value is OFF.
119 High start torque
(HIGH START TORQ.)
Value:
0.0 - 0.5 sec.
Function:
To ensure a high start torque approx. 1.8 x I
permitted for max. 0.5 sec. The current is, however,
limited by the variable frequency drive's (inverter's)
safety limit. 0 sec. corresponds to no high start torque.
Description of choice:
Set the necessary time for which a high start
torque is required.
120 Start delay
(START DELAY)
Value:
0.0 - 10.0 sec.
Function:
This parameter enables a delay of the start-up time
after the conditions for start have been fulfilled.
When the time has passed, the output frequency
will start by ramping up to the reference.
Description of choice:
Set the necessary time before commencing
to accelerate.
121 Start function
(START FUNCTION)
Value:
DC hold during start delay time
(DC HOLD/DELAY TIME)
DC brake during start delay time
(DC BRAKE/DELAY TIME)
Coasting during start delay time
(COAST/DELAY TIME)
Start frequency/voltage clockwise
(CLOCKWISE OPERATION)
Start frequency/voltage in reference direction
(VERTICAL OPERATION)
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.28.A8.22 - VLT is a registered Danfoss trademark
VLT® 2800 Series
Function:
This is where to choose the required mode during the
start delay time (parameter 120 Start delay time).
Description of choice:
Select DC hold during start delay time [0] to energize
the motor with a DC hold voltage during the start delay
time. Set voltage in parameter 137 DC hold voltage.
0.0 sec.
Choose DC brake during start delay time [1] to energize
the motor with a DC brake voltage during the start delay
time. Set voltage in parameter 132 DC brake voltage.
can be
INV.
Choose Coasting during start delay time [2] and the
motor will not be controlled by the variable frequency
drive during the start delay time (inverter turned off).
Choose Start frequency/voltage clockwise [3] to
obtain the function described in parameter 130
Start frequency and 131 Voltage at start during start
delay time. Regardless of the value assumed by
the reference signal, the output frequency equals
the setting in parameter 130 Start frequency and
the output voltage will correspond to the setting
in parameter 131 Voltage at start .
This functionality is typically used in hoist applications.
0.0 sec.
It is used in particular in applications in which a cone
anchor motor is applied, where the direction of rotation
is to start clockwise followed by the reference direction.
Select Start frequency/voltage in reference direction
[4] to obtain the function described in parameter
130 Start frequency and 131 Voltage at start
during the start delay time.
The direction of rotation of the motor will always
follow in the reference direction. If the reference signal
equals zero, the output frequency will equal 0 Hz,
while the output voltage will correspond to the setting
in parameter 131 Voltage at start. If the reference
signal is different from zero, the output frequency will
equal parameter 130 Start frequency and the output
voltage will equal parameter 131 Voltage at start. This
functionality is used typically for hoist applications with
[0]
counterweight. It is used in particular for applications
in which a cone anchor motor is applied. The cone
[1]
anchor moto r can break away using parameter 130
Start frequency and parameter 131 Voltage at start.
[2]
[3]
[4]
43
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