19
Power terminals: Field supply.
Field current actual value acquisition, shunt resistors and AD conversion
Line voltage measurement field infeed, also used for synchronizing the field gating unit.
Allocation Board:
Part number C98043-A7126, provides the terminal with plug connection to further modules
The EEPROM, the non-volatile memory for device data, is located on this module.
The device parameters are not saved on the allocation board, but in the ROM of the CUD.
If ordering this module as a spare part, specify the factory serial number and the MLFB
(order number 6RA80...) of the device so that the manufacturer can load this data into the
module before delivery.
Surge absorbing capacitor circuit:
Various modules depending on the rated data: Voltage / current of the devices.
The thyristors are synchronized by means of an RC element, the surge absorbing capacitor
circuit. Transition from a conducting to a non-conducting thyristor state occurs with a fast
current change. A fast current change in the circuit leads to overvoltages as a result of
available inductances (u = L * di / dt). The surge absorbing capacitor circuit is dimensioned in
such a way that any overvoltages resulting from commutation will be below the blocking
voltage of the thyristors.
Note:
A fault in the surge absorbing capacitor circuit can cause thyristor failure due to
overvoltage.
Controller structure of the SINAMICS DCM
The structure of the controller for the armature circuit:
Ramp-function generator:
See Sheet 3150, 3151, 3152 in Section 2 of the List Manual and Section 10.11.1 of the
Operating Instructions The ramp-function generator changes speed setpoint that suddenly
changes by means of an ascending ramp (ramp-up time p50303) and a descending ramp
(ramp-down time p50304) In addition, a lower transition rounding (p50305) at the beginning
and an upper transition rounding (p50306) at the end of the ramp-up function can be set. See
also p50611 to p50614.
The ramp-up/ramp-down time should be set high enough that the speed actual value can
follow the setpoint of the ramp-function generator output. This is the case if the set
current/torque limit of the drive is not reached during the ramp-function generator action and
the drive is still located in the possible control range.
the ramp-function generator times must be set to zero during positioning control with a
higher-level automation.
Setting the ramp-function generator to the content of the connector number in p50639:
P50639[0], set for the ramp-function generator output on a high signal from the binector
selected via p50640
p50639[1], setting the ramp-function generator output when Run state is no longer active
and the content of the binector selected in p50640 is low.
See also parameter p50295, p50302, p50317, p50318 and p50636 to p50641, p50646 and
p50647
Display of active times: r50315, display of ramp-function generator state: r50316.
Speed setpoint:
At ramp-function generator input: r52192; at ramp-function generator output: r52190,
at speed controller input: r52170.
Actual speed value:
Sheet 6810
Analog tachometer as the actual speed value (p50083 = 1), r52013, Sheet 2075
Normalization via p50741;
Pulse encoder as actual speed value (p50083 = 2), r00061 in RPM, Sheet 4710.
Normalization via p2000,
Pulse number of encoder p0400;