VLT
®
FCD Series
Function:
In these parameters 302-307 Digital inputs it is pos-
sible to choose between the different enabled
functions related to the digital inputs (terminals 18-
33).
Description of choice:
No operation is selected if the frequency converter is
not to react to signals transmitted to the terminal.
Reset resets the frequency converter after an alarm;
however, a few alarms cannot be reset (trip locked)
without first disconnecting the mains supply and re-
connecting it. See table under List of warnings and
alarms. Reset is activated on the leading edge of
the signal.
Coasting stop inverse is used for making the fre-
quency converter "let go" of the motor immediately
(output transistors are "turned off"), which means
that the motor runs freely to stop. Logic ’0’ leads to
coasting to stop.
Reset and coasting inverse are used to activate mo-
tor coast simultaneously with reset. Logical ’0’
means motor coast stop and reset. Reset is acti-
vated on the falling edge.
Quick stop inverse is used for activating the quick-
stop ramp down set in parameter 212 Quick stop
ramp-down time. Logic ’0’ leads to quick stop.
DC-braking inverse is used for stopping the motor by
energizing it with a DC voltage for a given time, see
parameters 126, 127 and 132 DC brake. Please note
that this function is only active if the value in param-
eter 126 DC braking time and 132 DC brake voltage
is different from 0. Logic ’0’ leads to DC braking.
Stop inverse, a logic ’0’ means that the motor speed
is ramped down to stop via the selected ramp.
None of the stop commands mentioned
above are to be used as repair switches.
C
heck that all voltage inputs are discon-
n
ected and that the prescribed time (4 mins.) has
p
assed before repair work is commenced.
Start is selected if a start/stop command is required.
Logic ’1’ = start, logic ’0’ = stop.
Latched start, if a pulse is applied for min. 14 ms,
the frequency converter will start the motor, provided
no stop command has been given. The motor can
be stopped by briefly activating Stop inverse.
Reversing is used for changing the direction of rota-
tion of the motor shaft. Logic ’0’ will not lead to
reversing. Logic ’1’ will lead to reversing. The re-
verse signal only changes the direction of rotation, it
does not activate the start. Is not active at Process
regulation, closed loop. See also parameter 200
Output frequency range/direction.
Reversing and start is used for start/stop and for
reversing with the same signal. No active start com-
mand is allowed at the same time. Is not active for
Process regulation, closed loop. See also parameter
200 Output frequency range/direction.
Start clockwise is used if you want the motor shaft
only to be able to rotate clockwise when started.
Should not be used for Process regulation, closed
loop.
Start anticlockwise is used if you want the motor
shaft only to be able to rotate anticlockwise when
started. Should not be used for Process regulation,
closed loop. See also parameter 200 Output fre-
quency range/direction.
Jog is used to override the output frequency to the
jog frequency set in parameter 213 Jog frequency.
Jog is active regardless of whether a start command
has been given, yet not when Coast stop, Quick-stop
or DC braking are active.
Freeze reference freezes the present reference. The
reference can now only be changed via Speed up
and Speed down.Iffreeze reference is active, it will
be saved after a stop command and in the event of
mains failure.
Freeze output freezes the present output frequency
(in Hz). The output frequency can now only be
changed via Speed up and Speed down.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.04.A1.02 - VLT is a registered Danfoss trade mark
75
Programming
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