Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
L
151
8400 StateLine C | Reference manual
Motor control (MCTRL)
V/f characteristic control - energy-saving (VFCplusEco)
5.5.4.2
Adapting the slope limitation for lowering the Eco function
The ramp set in
C00982
for voltage reduction serves as slope limitation in order to prevent
that voltage is suddenly applied to the motor when the Eco function is deactivated.
Otherwise, the overvoltage limitation (Imax, Clamp) would be activated.
This ramp is, depending on the device, pre-initialised to approx. the triple rotor time
constant. An adaptation of this parameter is not required.
When the Eco function is switched off, a quick reaction (high dynamic performance) is
required, but with a low current overshoot and a small torque jump. Thus, the Lenze
setting of
C00982
is a compromise regarding the switch-off of the Eco function (voltage
reduction = 0).
To increase the dynamics when switching off the Eco function:
Reduce
setting in
C00982
.
(Current compensation actions increase when the Eco function is switched off.)
In order to reduce current compensation actions when switching off the Eco function:
Increase
setting in
C00982
.
(The dynamics when switching off the eco function is reduced)
5.5.4.3
Optimising the cos/phi controller
With the Lenze setting, the cos
ϕ
controller is set such that usually no adaptation is required
for all power ratings and application cases.
Behaviour
Remedy/recommendation
The cos
ϕ
actual value (
C00979/1
) varies greatly.
Reduce gain Vp (
C00975
) and reset time Ti (
C00976
).
The cos
ϕ
actual value (
C00979/1
) is permanently lower
than the cos
ϕ
setpoint (
C00979/2
).
Increase gain Vp (
C00975
) and reset time Ti (
C00976
).
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