Internal Voltage Protection - Siemens SINAMICS S120 Function Manual

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Table of Contents

Basic functions

8.12 Armature short-circuit

Parameter assignment

1. Set p1231 = 1.

2. Define DI 14 as input with p0728.14 = 0.

3. Connect the feedback signal of the external armature short-circuit contactor with terminal 12

of terminal strip X132 (DI 14).

4. Interconnect p1235 with r0722.14.

5. Define DO 15 as output with p0728.15 = 1.

6. Connect the control signal for the external armature short-circuit contactor with terminal 13

of terminal strip X132 (DO 15).

7. Interconnect p0745 with r1239.0.

The parameterization of external armature short-circuit braking has now been completed.

Internal voltage protection

Function description

With the integrated voltage protection is active, after the pulses have been canceled, all the

motor terminals are at half of the DC link potential (without integrated voltage protection the

motor terminals have a no voltage condition)!

● Only short-circuit proof motors must be used (p0320 < p0323).

● The Motor Module must be able to withstand the 1.8-fold short-circuit current (r0320) of the

motor (r0209).

● The internal voltage protection function cannot be interrupted due to a fault response. If an

overcurrent occurs while internal voltage protection is active, the Motor Module and/or the

motor might sustain irreparable damage.

● If the Motor Module does not support the autonomous, integrated voltage protection

mechanism (r0192.10 = 0), an external 24 V supply (UPS) must be provided for the

components to ensure reliable operation in the event of mains power failure.

● If the Motor Module supports the autonomous, integrated voltage protection mechanism

(r0192.10 = 1), the 24 V supply for the components must be implemented via a Control

Supply Module to ensure reliable operation in the event of mains power failure.

● When the internal voltage protection function is active, the motor must not be powered by

an external source for an extended period of time (e.g. by loads that move the motor or

another coupled motor).

The internal voltage protection is set with p1231 = 3.

Configuring the function

Carry out the following steps to configure the function:

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions