VLT
®
6000 HVAC Series
Function:
In parameters 300-307
Digital inputs
it is possible to
choose between the different possible functions related
to the digital inputs (terminals 16-33). The functional
options are given in the table on the previous page.
Description of choice:
No function
is selected if the frequency converter is
not to react to signals transmitted to the terminal.
Reset
the frequency converter after an alarm; however,
trip locked alarms cannot be reset by cycling mains
power supply. See table in
List of warnings and alarms
. Reset will occur on the rising edge of the signal.
Coasting stop
, inverse is used to force the frequency
converter to "release" the motor immediately (the
output transistors are "turned off") to make it coast
freely to stop. Logic ‘0
’
implements coasting to stop.
Reset and coasting stop, inverse
is used for
activating coasting stop at the same time as reset.
Logic ‘0
’
implements coasting stop and reset. Reset
will be activate on the falling edge of the signal.
DC braking, inverse
is used for stopping the motor
by energizing it with a DC voltage for a given time,
see parameters 114-116
DC brake
.
Please note that this function is only active if the
value of parameters 114
DC brake curren
t and
115 DC braking time is different from 0. Logic ‘0
’
implements DC braking. See
DC braking
.
Safety interlock
has the same function as
Coasting
stop, inverse
, but
Safety interlock
generates the alarm
message
’
external fault
’
on the display when terminal
27 is logic ‘0
’
. The alarm message will also be active
via digital outputs 42/45 and relay outputs 1/2, if
programmed for
Safety interlock
. The alarm can be
reset using a digital input or the [OFF/STOP] key.
Start
is selected if a start/stop command is required.
Logic ‘1
’
= start, logic ‘0
’
= stop.
NB!:
Please note, that if the frequency converter is in
current limit the stop function will not be active.
Reversing
is used for changing the direction of
rotation of the motor shaft. Logic ‘0
’
will not implement
reversing. Logic ‘1
’
will implement reversing. The
reversing signal only changes the direction of
rotation; it does not activate the start function. Is
not active together with
Closed loop
.
Reversing and start
is used for start/stop and
reversing using the same signal. A start signal via
terminal 18 at the same time is not allowed. Is
not active together with
Closed loop
.
Freeze reference
freezes the present reference.
The frozen reference can now only be changed
by means of
Speed up
or
Speed down
. The
frozen reference is saved after a stop command
and in case of mains failure.
Freeze output
freezes the present output frequency
(in Hz). The frozen output frequency can now only be
changed by means of
Speed up
or
Speed down
.
NB!:
If
Freeze output
is active, the frequency
converter cannot be stopped via terminal
18. The frequency converter can only be
stopped when terminal 27 or terminal 19 has been
programmed for
DC braking, inverse
.
Selection of Setup, lsb
and
Selection of Setup,
msb
enables a choice of one of the four Setups.
However, this presupposes that parameter 002
Active
Setup
has been set at
Multi Setup
[5].
Setup, msb
Setup, lsb
Setup 1
0
0
Setup 2
0
1
Setup 3
1
0
Setup 4
1
1
Preset reference, on
is used for switching between
remote reference and preset reference. This assumes
that
Remote/prese
t [2] has been selected in parame-ter
210
Reference type
. Logic ‘0
’
= remote references
active; logic ‘1
’
= one of the four preset references is
active in accordance with the table below.
Preset reference, lsb
and
Preset reference,msb
enables a choice of one of the four preset references,
in accordance with the table below.
Preset ref. msb
Preset ref. lsb
Preset ref. 1
0
0
Preset ref. 2
0
1
Preset ref. 3
1
0
Preset ref. 4
1
1
Speed up and speed down
are selected if
digital control of the up/down speed is desired.
This function is only active if
Freeze
reference or
Freeze output
has been selected.
As long as there is a logic ‘1
’
on the terminal selected
for
Speed up
, the reference or the output frequency will
increase by the
Ramp-up time
set in parameter 206.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.61.A5.02 - VLT is a registered Danfoss trademark
102