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REOVIB MFS 268 UL/CSA
Operating Instructions
29
ELEKTRONIK
Frequency adjustment range
The control unit is supplied with a maximum frequency range of 5…150Hz. Using an adjustable under
and over frequency limits, the user range (parameter F) can be restricted to a maximum ratio of 1:4.
In regulation mode, this restricted frequency range has great importance because it assists with the accu-
rate determination of the measurement signals from the accelerometer. During the automatic frequency
search a maximum sweep range of 1:4 is possible. The lower (FL) and upper (FH) frequency limits re-
strict the range. A narrow setting of the limits of less than 1:4 is possible and also advisable because this
ensures that widely different changes of the frequency cannot occur when the user is setting up the sys-
tem.
The range of the automatic frequency control (AFC) is also limited by these settings.
A practical setting is +/- 20 % of resonance.
1. Set lower frequency limit.
2. Set upper frequency limit.
Current limiting
The current limit is used to set the controller for the rated current of the coil I
M
. The current limit I
MAX
is set
by using parameter I. The displayed setting is expressed as a percentage of the controllers rated current
I
N
(100 % corresponds to the units rated current).
To protect the coils the current limit must be set to the rated current for the coil(s) I
M
.
When several coils are connected in parallel the coil current is the sum of all individual currents.
N
M
MAX
I
I
I
100
⋅
=
5 Hz
300 Hz
F.L.
F.H.
F.L.
F.H.
max. 1 : 4
Possible frequency range
Parameter "F.L." and "F.H."
Menü "C 040"
Usable frequency range
Parameter "F"
Menü "C 008", "C 096", C "020"