VLT
®
8000 AQUA
brake current
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
1)
is selected if a start/stop command is required.
Logic "1" = start, logic "0" = stop.
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. It can not be used in
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
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
or
Selection of Setup,
msb
enables a choice of one of the four Setups.
However, this assumes 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/preset
[2] has been
selected in parameter 210
Reference type
. Logic
"0" = remote references active; logic "1" = one of
the four preset references is active in accordance
with the table on the next page.
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.
As long as there is a logic "1" on the terminal selected for
Speed down
, the reference or the output frequency will
decrease by the
Ramp-down time
set in parameter 207.
Pulses (logic "1" minimum high for 3 ms and a minimum
pause of 3 ms) will lead to a change of speed of 0.1%
(reference) or 0.1 Hz (output frequency).
Example:
Terminal
Terminal
Freeze ref./
(16)
(17)
Freeze output
No speed
change
0
0
1
Speed down
0
1
1
Speed up
1
0
1
Speed down
1
1
1
The speed reference, frozen via the control panel,
can be changed even if the frequency converter has
stopped. In addition, the frozen reference will be
remembered in case of a mains failure.
Run permissive.
There must be an active start
signal via the terminal, where
Run permissive
has
been programmed, before a start command can be
accepted.
Run permissive
has a logic ‘AND
’
function
related to Start (terminal 18, parameter 302
Terminal
18, Digital input
), which means that in order to start
the motor, both conditions must be fulfilled. If
Run
permissive
is programmed on several terminals,
Run
permissive
must only be logic "1" on one of the
terminals for the function to be carried out.
Jog
is used to override the output frequency to
the frequency set in parameter 209
Jog frequency
and issue a start command. If local reference is
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.83.A2.02 - VLT is a registered Danfoss trademark
120