Siemens SINAMICS G120 Operations Instructions download pdf (Page 174)

Functions

7.6 Motor control

Inverter with CU240B-2 and CU240E-2 Control Units

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

Note

Only increase the voltage boost in small steps until satisfactory motor behavior is reached.

Excessively high values in p1310 ... p1312 can cause the motor to overheat and switch off

(trip) the inverter due to overcurrent .

Table 7- 25 Optimizing the starting characteristics for a linear characteristic

Parameter Description

P1310 Permanent voltage boost (factory setting 50 %)

The voltage boost is active from standstill up to the rated speed.

It is at its highest at speed 0 and continually decreases as the speed increases.

Value of voltage boost at zero speed in V:

1.732 × rated motor current (p0305) × stator resistance (r0395) × p1310 / 100 %.

P1311 Voltage boost on acceleration

The voltage boost on acceleration is independent of speed and occurs when the setpoint

is increased. It disappears as soon as the setpoint is reached.

Value in V: 1.732 × rated motor current (p0305) × stator resistance (r0395) x p1311 /

100 %

P1312 Voltage boost at start up

The voltage boost at start-up results in an additional voltage boost when accelerating,

but only the first time the motor accelerates after it has been switched on.

The voltage boost in V is: 1.732 x rated motor current (p0305) × stator resistance (r0395)

x p1312 / 100%

You will find more information about this function in the parameter list and in function

diagram 6300 of the List Manual.

1 2 ... 169 170 171 172 173 174 175 176 177 178 179 ... 303 304

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Siemens SINAMICS G120 Operations Instructions Page 174