Danfoss VLT 5000 Series Instruction Manual page 98

(CLOCKWISE OPERATION)
Start frequency/voltage in reference direction
(HORIZONTAL OPERATION)
plus
VVC clockwise
(VVC+ CLOCKWISE)
Function:
This is where the desired state during start delay (pa-
rameter 120) is selected.
Description of choice:
Select DC hold in the start delay time [0] so as to ener-
gize the motor with a DC holding current (parameter
124) in the start delay time.
Select DC brake in the start delay time [1] so as to en-
ergize the motor with a DC braking current (parameter
125) in the start delay time.
Select Coasting in the start delay time [2] and the motor
will not be controlled by the adjustable frequency drive
during the start delay time (inverter off).
Start frequency/voltage clockwise [3] and VVC
wise [5] is typically used in hoisting applications. Start
frequency/voltage in reference direction [4] is used es-
pecially in applications with counterweight.
Select Start frequency/voltage clockwise [3] so as to
have the function described in parameter 130 and 131
in the start delay time.
The output frequency will equal the setting of the start
frequency in parameter 130, and the output voltage will
equal the setting of the start voltage in parameter 131.
Regardless of the value assumed by the reference
signal, the output frequency will equal the setting of the
start frequency in parameter 130 and the output volt-
age will correspond to the setting of the start voltage
in parameter 131.
This functionality is used typically in hoisting applica-
tions.
This is used especially in applications with a cone ar-
mature motor, where the start is to be clockwise, fol-
lowed by rotation in the reference direction.
Select Start frequency/voltage in reference direction [4]
in order to obtain the function described in parameters
130 and 131 during the start delay time. The motor will
always rotate in the reference direction.
If the reference signal equals zero (0) parameter 130
Start frequency will be ignored and the output frequen-
cy will equal zero (0). The output voltage will corre-
= factory setting, () = display text, [] = value for use in communication via serial communication port
MG.51.C5.22 - VLT is a registered Danfoss trademark.
VLT
spond to the setting of the start voltage in parameter
131 Start voltage.
[4]
plus
Select VVC clockwise [5] so as to have only the
function described in parameter 130 Start frequency
[5]
in the start delay time. The start voltage will be calcu-
lated automatic. Notice that this function only uses the
start frequency in the start delay time.
Regardless of the value assumed by the reference
signal, the output frequency will equal the setting of the
start frequency in parameter 130.
122 Function at stop
(FUNCTION AT STOP)
Value:
Coasting (COAST)
DC hold (DC-HOLD)
Motor check (MOTOR CHECK)
Pre-magnetizing (PREMAGNETIZING)
plus
clock- Function:
Here it is possible to select the function of the adjust-
able frequency drive after a stop command or when
the frequency has been ramped down to 0 Hz. See
parameter 123 with respect to activation of this pa-
rameter regardless of whether the stop command is
active.
Description of choice:
Select Coasting [0] if the adjustable frequency drive is
to 'let go' of the motor (inverter closed).
Select DC hold [1] when a DC holding current set in
parameter 124 is to be activated.
Select Motor check [2] if the adjustable frequency
drive is to check whether or not a motor has been con-
nected.
Select Pre-magnetizing [3]. The magnetic field is built
up in the motor while it remains stopped. This ensures
that the motor can produce torque as quickly as pos-
sible on starting.
Min. frequency for activating function
123
at stop
(MIN.F. FUNC.STOP)
Value:
0.0 - 10.0 Hz
®
5000 Series
[0]
[1]
[2]
[3]
0.0 Hz
95