Configuring; Features; Speed Limitation - Siemens SINAMICS S120 System Manual

Configuring

10.1

Features

10.1.1

Speed limitation

The SINAMICS S120 High Frequency Drive was developed for the operation of high-speed
synchronous and induction motors.
In order to minimize the motor losses that occur, HF Drive operates with an output filter (HF
Sine Filter Module), which significantly reduces the pulse-frequency components of the
inverter output voltage at the motor terminals.
Operating the HF Sine Filter Module can mean that the motor speed is restricted.
There are two options available to counteract this speed limitation of the motor or restriction
of the maximum inverter output frequency:
● Using a Voltage Protection Module (VPM) for synchronous motors
● Operate the HF Drive with a pulse frequency of 32 kHz, if the reduced inverter current is
sufficient for the application.
The following table provides an overview of how a possible speed limitation can be avoided.
Table 10- 1 Measures to avoid speed limitation
Connect a Voltage Protection Module (VPM)
Operate the HF Drive with 32 kHz pulse frequency
(take derating into consideration)
Note
The Voltage Protection Module for synchronous motors must always be used together with a
Braking Module and a Control Supply Module.
High Frequency Drive
System Manual, (SH2), 04/2015, 6SL3097-4AH10-0BP3
Synchronous motors
X
X
10
Induction motors
--
X
151