3 adapt machine data, 1 determine speed range (fdmin, fdmax), Adapt machine data – Lenze 8240 frequency inverters User Manual
Page 35: Determine speed range (fdmin, fdmax), Commissioning, 1 determine speed range (f
Commissioning
UOOu_^MTMO
5-3
L
5.3
Adapt machine data
5.3.1
Determine speed range (f
dmin,
f
dmax)
Code
Name
Possible settings
IMPORTANT
Lenze
Selection
Info
C010 Minimum field
frequency
0.0
0.0
{0.1Hz}
480.0
C011 Maximum field
frequency
50.0
7.5
{0.1Hz}
480.0
Function
The speed range required for the application can be selected here by determing the field
frequencies f
dmin
and f
dmax
:
D
f
dmin
corresponds to the speed at 0 % speed setpoint selection.
D
f
dmax
corresponds to the speed at 100 % speed setpoint selection.
Adjustment
Relation between field frequency and synchronous motor speed:
е
клуе
=
С
Зг~с
⋅ SM
é
n
rsyn
synchronous motor speed [min
-1
]
f
dmax
max. field frequency [Hz]
p
number of pole pairs
Example: 4 pole asynchronous motor:
p = 2, f
dmax
= 50 Hz
е
клуе
=
RM ⋅ SM
O
= NRMM ãáå
ÓN
Important
D
With the setting of f
dmin
> f
dmax
the field frequency is limited to f
dmax
.
D
When selecting the setpoint by means of JOG values, f
dmax
acts as limitation.
D
f
dmax
is and internal standardization variable:
- Use the LECOM interface only for important modifications, when the controller is inhibited.
D
Observe the maximum speed of the motor!
D
f
dmin
is only effective under the following conditions:
- With analog setpoint selection.
- With the motor potentiometer function ”DOWN”.
Special features
D
With field frequencies f
d
> 300Hz:
- Avoid chopper frequencies < 8 kHz.
D
With C500 and C501, you can relate the display value of f
dmin
and f
dmax
to a process value.
fd
C011
(fdmax)
C010
(fdmin)
0 %
100 %
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