VLT
®
FCD Series
Programming, FCD
300
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.
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
counterweight. It is used in particular for applications
in which a cone anchor motor is applied. The cone
anchor motor can break away 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 frequency
converter after the output frequency has become
lower than the value in parameter 123
The min.
frequency for activation of function at stop
or after
a stop command and when the output frequency
has been 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.
123 Min. frequency for activation of
function at stop
(MIN.F.FUNC.STOP)
Value:
0,1 - 10 Hz
✭
0,1 Hz
Function:
In this parameter, the output frequency is set at
which the function selected in parameter 122
Function at stop
is to be activated.
Description of choice:
Set the required output frequency.
NB!:
If parameter 123 is set higher than parameter
130, then the start delay function (parameter
120 and 121) will be skipped.
NB!:
If parameter 123 is set too high, and DC
hold has been chosen in parameter 122,
the output frequency will jump to the value
in parameter 123 without ramping up. This may
cause an overcurrent warning / alarm.
■
DC Braking
During DC braking DC voltage is supplied to the
motor, and this will cause the shaft to be brought to
a standstill. In parameter 132
DC brake voltage
DC
brake voltage can be preset from 0-100%. Max. DC
brake voltage depends on the motor data selected.
In parameter 126
DC braking time
DC braking time
is determined and in parameter 127
DC brake cut-in
frequency
the frequency at which DC braking becomes
active is selected. If a digital input is programmed to
DC
braking inverse
[5] and shifts from logic
’
1
’
to logic
’
0
’
,
DC braking will be activated. When a stop command
becomes active, DC braking is activated when the
output frequency is less than the brake cut-in frequency.
NB!:
DC braking may not be used if the inertia in
the motor shaft is more than 20 times greater
than the motor
’
s internal inertia.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.B7.02 - VLT is a registered Danfoss trademark
43
