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 currentand
115 DC braking time is different from 0. Logic ‘0’
implements DC braking. See DC braking.
Safety interlock has the same function as Coasti
ng
stop, inverse,butSafety 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 com
mand is required.
Logic ‘1’ = start, logic ‘0’ =stop.
NB!:
Please note, that if the frequency converter is in
current limit the stop functi
on 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 cha
nges 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 s
ame 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 Rem
ote/preset [2] has been selected in parame-ter
210 Reference type. Logic ‘0’ = remote references
active; logic ‘1’ = one of the four preset references is
acti
ve in accordance with the table below.
Pre
set 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
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