SIEMENS
6/100
Siemens CR 1 · 2015
6
Drive systems
SIMOTRAS HD AC power controller
■
Characteristic curves
The speed changes steplessly in the control range when the
master switch is operated. The crane driver only detects the end
of the control range through latching of the master switch. Fur-
thermore, the final stage is reached sub-synchronously or super-
synchronously, depending on the load, by traversing the charac-
teristics that are determined by the resistor increments. Current
control is always operating to ensure that the set maximum
torques are not exceeded. It goes without saying that the circuits
are protected against reversal.
Control characteristics for hoists
Up to 4 rotor resistor switching stages can be provided. If less
than 4 stages are implemented, the top stages (S3/S4) remain
unused.
If the upper stages S3/S4 are not used, the over-synchronized
speed increases in accordance with the parameterized charac-
teristic on lowering. This must be taken into account when selec-
ting overspeed protection. For this reason, a speed correspon-
ding to the characteristic can also only be achieved during
lifting.
100
80
60
40
20
-20
-60
-80
-120
%
%
-140
-100
-60
-20
20
60
100
140
180
%
%
*
*
*
S3
S2
S1
S4
S3
S2
S1
S4
-40
K
-
M
K
-
n
+
M
+
n
Driving lifting
Braking lowering
Braking lifting
Full-load curve
lifting
Full-load curve
lowering
Driving lowering
G_CR01_EN_00161
SIMOTRAS HD control range
K
Characteristics for reversing mode (counter-current braking), i.e.
Delay lowering with pull-through loads or
Delay lifting when active reversing mode is required
S2, S3, S4
Characteristics for controlled mode
*
Use of current limiting (e.g.
I
max
= 2 x
I
rated
)
© Siemens AG 2015