SIEMENS
6/91
Siemens CR 1 · 2015
6
Drive systems
SIMOTRAS HD AC power controller
■
Function
Master switch signals
The incoming signals from the master switch, such as setpoint
and control enable, are loaded.
•
A master switch with setpoint potentiometer can be connected
direct to the SIMOTRAS HD.
•
A 4-stage master switch requires the CUD2 terminal expan-
sion module for connection.
Ramp-function generator
The series-connected ramp-function generator with adjustable
ramps forms the speed setpoint.
Speed controller
The speed controller with the subordinate current control circuit
is connected down-circuit of the ramp-function generator and
forms the actual control loop.
Start pulse
A start pulse is also generated so that the machine is activated
in the hoisting direction of rotation immediately after power up.
This prevents the load from dropping on start-up.
Sequencer
For switching through the rotor stages, a sequencer is installed
that selects the planned stages speed-dependently and activa-
tes reversing.
Standstill monitoring
The integral zero-speed monitoring supports guided, electrical
braking of the drive. For replacing the cable, e.g. in hoists, jog
mode with creep speed is provided.
Operating states
The operating states are indicated in the device on a 5-digit, 7-
segment display as well as the LEDs of the basic PMU operator
panel.
Operating modes
The threshold for switchover between closed-loop and open-
loop controlled operation can be defined in accordance with the
control characteristic and set on the parameters of the device.
Parallel connection
To increase the performance, up to 6 devices can be connected
in parallel. The terminal expansion option (CUD2) is required in
this case for every device and (n-1) patch cable. Current split-
ting requires identical, separate parallel switching reactors for
each SIMOTRAS device. The difference in reactor tolerances
determines the current distribution. For operation without dera-
ting (current reduction), a tolerance of 5 % or better is recom-
mended. Only devices with the same current ratings are permit-
ted to be connected in parallel.
© Siemens AG 2015