Danfoss VLT 8000 AQUA series Operating Instructions Manual page 144

433 Motor Alternation Time
(MOTOR ALT. TIME)
Value:
0 (OFF) - 999 hrs
Function:
This is the time that sets the length of time between
motor alternation events. When the time elapses,
the relay selected in parameter 323 or 326 changes
state and initiates the external control devices that
disconnect the active motor and connect the alternate
motor. (Contactors or Starters used to connect and
disconnect the motors are supplied by others.)
The timer resets after completition of the
alteration sequence.
Parameter 434 - Motor Alteration Function, selects
the type of stop - Ramp or Coast.
Description of choice:
Sets the time between motor alternation events.
= factory setting. () = display text [] = value for use in communication via serial communication port
144
434 Motor Alteration Function
(MOTOR ALT. FUNCTION)
Value:
Ramp (RAMP)
Coast (COAST)
Function:
When a motor is stopped after the duration set in
parameter 433, Motor alternation time expires, the
motor is commanded to either coast or ramp to a stop.
If the motor is not running at the time of alteration, the
relay simply changes state. If the motor is running
at the time of alteration, a start command is sent
following alteration. Motor Alteration is displayed on
the drive control panel during alternation.
When Coast is selected, after coasting is initiated, a
delay of 2 seconds occurs prior to the relay changing
state. Ramp-down time is set in parameter 207.
Description of choice:
Set the desired stop function.
483 Dynamic DC link compensation
(DC LINK COMP.)
OFF
Value:
Off
On
Function:
The frequency converter includes a feature, which
ensures that the output voltage is independent of
any voltage fluctuation in the DC link, e.g. caused
by fast fluctuation in the mains supply voltage. The
benefit is a very steady torque on motor shaft (low
torque ripple) under most mains conditions.
Description of choice:
In some cases this dynamic compensation can
cause resonance's in the DC link and should then
be disabled. Typical cases are where a line choke or
a passive harmonic filter (e.g. filters AHF005/010)
is mounted in the mains supply to the frequency
converter to suppress harmonics. Can also occur
on mains with low short circuit ratio.
NB!:
This is a hidden parameter. The only access
is with the MCT 10 software tool.
MG.83.A2.02 - VLT is a registered Danfoss trademark
®
VLT 8000 AQUA
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