UNIFREM v.3.41x
10 May 2017
Page 156 from 180
The principle of the "Dynamic lift" function.
8.14 IRC detuning function
Frequency converters UNIFREM can simultaneously evaluate the real-time signals from two
incremental encoders in case of use the extension module RM_IRC_DUAL. Converter calculates
the speed difference of these sensors and this difference is displayed in the parameter „Freq.
IRC1-
IRC2“ (ID 1086) according the formula:
F
IRC1-IRC2
= | |F
IRC1
|
–
|F
IRC2
| |
|F
IRC1(2)
| means absolute value of the speed calculation from the values „Frequency IRC1” (ID 434)
and „Frequency IRC2” (ID 803).
The need to derive some control actions as torque restriction, block or immediate shutdown from
the detuning can occur in the multi-motor drives in practice.
0
Measured load
Maximum speed as a
function of measured load
[Hz]
ID111
ID1073
ID1072 ID1071
[%]
A
B
ŠTART
DL maximal load
ID 1071 [%]
t [s]
Load
ID 854 [%]
0
W61-
Dynamic lift
0
f
NOM
[Hz]
DL frequency
ID 1073 [Hz]
0
F
SET
DL measurement period
ID 1070 [s]
DL minimal load
ID 1072 [%]
t [s]
t [s]
STOP
A
B
Max. frequency
ID 111 [Hz]
DL limits the maximum
speed according to the
load
A
: Weight lifting with lower weight
B
: Weight lifting with a large weight
