As long as there is a logic ‘1’ on the terminal selected
for Speed down, the reference or the output frequency
will increase 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 stop-
ped. In addition, the frozen reference will be remem-
bered in case of a mains failure.
Run permissive . There must be an active start signal
via the terminal, where Run permissive has been pro-
grammed, 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. See Example of application
- Speed control of fan in ventilation system.
Jog is used to override the output frequency to the
frequency set in parameter 209 Jog frequency and is-
sue a start command. If local reference is active, the
frequency converter will
always be in Open loop [0],
regardless of the selection made in parameter 100
Configuration.
Jog is not active if a stop command has been given via
terminal 27.
Data change lock is selected if data changes to pa-
rameters are not to be made via the control unit; how-
ever, it will still be possible to carry out data changes
via the bus.
Pulse reference is selected if a pulse sequence (fre-
quency) is selected as a reference signal.
0 Hz corresponds to Ref
MIN
, parameter 204 Minimum
reference, Ref
MIN
.
The frequency set in parameter 327 Pulse reference,
max. frequency corresponds to parameter 205 Maxi-
mum reference, Ref
MAX
.
Pulse feedback is selected if a pulse sequence (fre-
quency) is selected as a feedback signal. Parameter
328 Pulse feedback, max. frequency is where the max-
imum frequency for pulse feedback is set.
Hand start is selected if the frequency converter is to
be controlled by means of an external hand/off or H-
O-A switch. A logic ‘1’ (Hand start active) will mean that
the frequency converter starts the motor. A logic ‘0’
means that the connected motor stops. The frequency
converter will then be in OFF/STOP mode, unless
there is an active Auto start signal. See also the de-
scription in Local control.
NB!
An active Hand and Auto signal via the
digital inputs will have higher priority than
the [HAND START]-[AUTO START] con-
trol keys.
Auto start is selected if the frequency converter is to
be controlled via an external auto/off or H-O-A switch.
A logic ’1’ will place the frequency converter in auto
mode allowing a start signal on the control terminals
or the serial communication port. If Auto start and
Hand start are active at the same time on the control
terminals, Auto start will have the highest priority. If
Auto start and Hand start are not active, the connected
motor will stop and the frequency converter will then
be in OFF/STOP mode.
Fire Mode is selected if the Fire Mode function is to
be activated via a logical ’1’ on terminal 16 or 17. This
enables the frequency converter to run without trip lock
in case of alarms or warnings. If an alarm causes a trip
an automatic reset is activated. Please note Fire Mode
must be enabled in parameter 430 for terminal 16 or
17 to activate the Fire Mode. The frequency converter
will run at the in parameter 431 selected speed.
Only by setting input 16 or 17 low or opening terminal
27 deactivates fire mode again.
Fire Mode inverse is selected if the Fire Mode func-
tion is to be activated via a logical ’0’ on terminal 16 or
17. This enables the frequency converter to run with-
out trip lock in case of alarms or warnings. If an alarm
causes a trip an automatic reset is activated. Please
note Fire Mode must be enabled in parameter 430 for
VLT
®
6000 HVAC Series
= factory setting, () = display text, [] = value for use in communication via serial communication port
126 MG.61.B5.02 - VLT
®
is a registered Danfoss trademark
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