Field Reversal; Direction Of Rotation Reversal Using Field Reversal - Siemens SINAMICS DCM Operating Instructions Manual

Descriptions of functions

10.26 Field reversal

10.26 Field reversal
see also the SINAMICS DCM List Manual, function diagram 6920
When using a two-quadrant unit (with only one armature current flow direction) by reversing
the current in the excitation winding of the DC motor (field reversal) operation in additional
quadrants of the speed-torque characteristic is possible (direction of rotation reversal and
braking).
Two contactors are required in the field circuit to reverse the field voltage.
The functions "Direction of rotation reversal using field reversal" and "Braking using field
reversal" control connector outputs r53195[0] (close field contactor 1) and r53195[1] (close
field contactor 2), which are then used to control the two field contactors.
A protection circuit is required in the field circuit.
r53195[0]
r53195[1]
10.26.1

Direction of rotation reversal using field reversal

The function "Direction of rotation reversal using field reversal" is controlled via the
connector input selected with p50580 - and this has a switch function. It defines the field
direction and therefore also the direction of rotation for a positive speed setpoint.
Connector input = 0
Connector input = 1
Changing the logical level of the connector input controlling the function "Direction of rotation
reversal using field reversal " brakes the drive and accelerates it in the opposite direction of
rotation.
Field reversal is completely executed. Level changes at the connector input have no effect
while the field is being reversed.
Note
Only positive speed setpoints make sense.
470
= 0 No contactor control
= 1 Control for a contactor to switch-in the positive field direction
= 0 No contactor control
= 1 Control for a contactor to switch-in the negative field direction
A positive field direction is selected.
"Close field contactor 1" (r53195[0]) = 1, "Close field contactor 2"
(r53195[1] = 0
A negative field direction is selected.
"Close field contactor 1" (r53195[0]) = 0, "Close field contactor 2"
(r53195[1] = 1
Operating Instructions, 1.2012, C98130-A7066-A1-05-7619
SINAMICS DCM DC Converter