Siemens SINAMICS Series User Manual

Descriptions of functions
10.29 Field reversal
SINAMICS DCM DC Converter
620 Operating Instructions, 12/2018, A5E34763375A
10.29
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]
= 0
No contactor control
= 1
Control for a contactor to switch
-in the positive field direction
r53195[1]
= 0
No contactor control
= 1
Control for a contactor to switch-in the negative field direction
10.29.1
Direction of rotation reversal using field reversal
The function "Direction of rotation reversal using field reversal" is controlled using the signal
source (binector) selected at binector input p50580 and this has a switch-type function. It
defines the field direction and therefore also the direction of rotation for a positive speed
setpoint.
Binector = 0
A positiv
e field direction is selected.
"
Close field contactor 1" (r53195.0) = 1, "Close field contactor 2"
(r53195.1) = 0
Binector = 1
A negative field direction is selected.
"
Close field contactor 1" (r53195.0) = 0, "Close field contactor 2"
(r53195.1) = 1
Changing the logical level of the binector 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.

Siemens SINAMICS Series Specifications

General

Product Line	SINAMICS
Cooling Method	Air-cooled, Liquid-cooled
Voltage Range	200 V to 690 V
Power Range	0.12kW - 250kW
Communication Interfaces	PROFINET, PROFIBUS, Ethernet
Control Modes	Vector control, V/f control
Protection Class	IP20
Type	Variable Frequency Drives (VFD)