VLT
®
6000 HVAC
119MG.60.B1.02 - VLT is a registered Danfoss trade mark
★ = factory setting. ( ) = display text [ ] = value for use in communication via serial communication port
Programming
Description of choice:
Set the required start frequency.
NB!
If the VLT frequency converter is running at the
current limit before the desired start frequency
is obtained, the process regulator will not be
activated. For the regulator to be activated anyway,
the start frequency must be lowered to the required
output frequency. This can be done during operation.
423 PID proportional gain
(PID PROP. GAIN)
Value:
0.00 - 10.00 ★ 0.01
Function:
The proportional gain indicates the number of times
the deviation between the reference/setpoint and the
feedback signal is to be applied.
Used in Closed loop [1] (parameter 100).
Description of choice:
Quick regulation is obtained by a high gain, but if the
gain is too high, the process may become unstable.
424 PID integration time
(PID INTEGR.TIME)
Value:
0.01 - 9999.00 sec. (OFF) ★ OFF
Function:
The integrator provides a constant change of the
output frequency during constant error between the
reference/setpoint and the feedback signal.
The greater the error, the quicker the integrator
frequency contribution will increase. The integration
time is the time needed by the integrator to reach the
same gain as the proportional gain for a given
deviation.
Used in Closed loop [1] (parameter 100).
Description of choice:
Fast regulation is obtained in connection with a short
integration time. However, this time may be too short,
which means that the process may be destabilised as
a result of overswings.
If the integral time is long, major deviations from the
required set point may occur, since the process regu-
lator will take a long time to regulate in relation to a gi-
ven error.
425 PID differentiation time
(PID DIFF. TIME)
Value:
0.00 (OFF) - 10.00 sec. ★ OFF
Function:
The differentiator does not react to a constant error. It
only contributes when the error changes.
The quicker the error changes, the stronger the
contribution from the differentiator will be. This
influence is proportional to the speed by which the
deviation changes.
Used in Closed loop [1] (parameter 100).
Description of choice:
Fast regulation can be obtained by means of a long
differentiation time. However, this time may be too
long, which means that the process may be
destabilised as a result of overswings.
426 PID differentiator gain limit
(PID DIFF. GAIN)
Value:
5.0 - 50.0 ★ 5.0
Function:
It is possible to set a limit for the differentiator gain.
The differentiator gain will increase if there are fast
changes, which is why it can be beneficial to limit this
gain, thereby obtaining a pure differentiator gain at
slow changes and a constant differentiator gain
where quick changes to the deviation are made.
Used in Closed loop [1] (parameter 100).
Description of choice:
Select a limit to differentiator gain as required.
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