Danfoss VT2800 Series User Manual

VLT
®
2800 Series
Description of choice:
Set the necessary ti me for which a high
start torque is required.
120 Start delay
(START DELAY)
Value:
0.0 - 10.0 sec.
✭ 0.0 sec.
Function:
This parameter enables a delay of the start-up t ime
after the conditions for start ha ve bee n 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 TIM E)
[0]
DC brake during start delay time
(DC BRAKE/DELAY TIME)
[1]
✭Coasting during start delay time
(COAST/DELAY TIME)
[2]
Start freque ncy/voltage cloc kwise
(CLOCKWISE OPERATION)
[3]
Start frequency/voltage in reference direction
(VERTICAL OPERATION)
[4]
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.
Choose DC brake during start delay time [1] to energize
the motor with a D C brake voltage during the start delay
time. Set voltage in parameter 132 DC brake voltage.
Choose Coasting during start delay time [2] and the
motor will not be controlled by the freque ncy co nverter
during the start delay time (inverter turned off).
Choose Start frequency/voltage clockwise [3] to
obtain the funct i on de scribed 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 applic ations.
It is used in particula r in applications in which a cone
anchor motor is applied, where the direction of rotation
is to start clockwise followed by the reference direct ion.
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 t ime.
The d irection of rotation of the motor will always
follow i n the reference d irection. 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 Voltageatstart. If the reference
signal is different from zero, the output frequency will
equal parameter 130 Start frequency and the output
voltage wil l equal parameter 131 Voltage at start.This
functionality is used typically for hoist applications with
counterweight. It is used in particula r for applications
in which a cone anchor motor is applied. The cone
anchor motor can break a way using parameter 130
Start frequency and parameter 131 Voltage at start.
122 Function at stop
(FUNCTION AT STOP)
Value:
✭Coasting (COAST)
[0]
DC hold (DC HOLD)
[1]
Function:
This is where to choose the function of the freque
ncy
converter after the output frequency has become
lower than the value in parameter 123 The min.
frequency for activation of functi on at stop
or after
a stop command and when the output frequency
has bee n ramped down to 0 Hz.
Description of choice:
Select Coasting [0] if the frequency converter is to
’let go’ of the motor (inverter turned off) .
Select DC hold [1] if parameter 137 DC hold
voltage is to be activated.
✭ = factory setting. () = di splay text [] = value for use in communication via serial communicat ion port
MG.28.E9.02 - VLT is a registered Danfoss trademark
72

Danfoss VT2800 Series Specifications

General

Brand	Danfoss
Model	VT2800 Series
Category	Controller
Language	English