Siemens SINAMICS G120 Operations Instructions download pdf (Page 162)

Functions

7.4 Setpoint sources

Inverter with CU240B-2 and CU240E-2 Control Units

160 Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

7.4.2 Motorized potentiometer as setpoint source

The 'motorized potentiometer' (MOP) function simulates an electromechanical potentiometer

for entering setpoints. You can continuously adjust the motorized potentiometer (MOP) using

the control signals "raise" and "lower". The control signals are received via the digital inputs

of the inverter or from the operator panel that has been inserted.

Typical applications

● Entering the speed setpoint during the commissioning phase.

● Manual operation of the motor should the higher-level control fail.

● Entering the speed setpoint after changeover from automatic operation to manual

operation.

● Applications with largely constant setpoint and without higher-level control.

Principle of operation

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Figure 7-9 Function chart of motorized potentiometer

Motorized potentiometer parameters

Table 7- 16 Basic setup of motorized potentiometer

Parameter Description

p1047 MOP ramp-up time (factory setting 10 s)

p1048 MOP ramp-down time (factory setting 10 s)

p1040 Start value of MOP (factory setting 0 rpm)

Determines the start value [rpm] that becomes effective when the motor is switched

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Siemens SINAMICS G120 Operations Instructions Page 162