8
05.01
8.16 VPM Voltage Protection Module
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
8.16
VPM Voltage Protection Module
8.16.1
General information
The Voltage Protection Module VPM (voltage limiting module) is used for per-
manent–magnet synchronous motors with an EMF of 800 Vrms up to 2000
Vrms in order to limit the DC link voltage at the converter in the case of a fault.
The Voltage Protection Module is connected between the power module and
motor in the motor cable. If, at maximum speed, the line voltage fails, or if as a
consequence of this, the converter pulses are deleted, the synchronous motor
feeds back the full voltage into the DC link.
The VPM identifies an excessively high DC link voltage (> 800 V) and short–cir-
cuits the three motor feeder cables. The energy remaining in the motor is con-
verted into heat as a result of the short–circuit between the VPM and the motor
feeder cables.
The Voltage Protection Module is available in 3 different versions.
Table 8-4
Overview of the Voltage Protection Modules that are available
Designation
Rated current
VPM 120
120 A
VPM 200
200 A
VPM 200 Dynamik
200 A
When using third–party synchronous motors (generally, with higher inductances
then 1FE motors), when combining a third–party synchronous motor with a se-
ries reactor as well as the combination of 1FE motor with series reactor, then
the VPM 200 Dynamik should be used.
The reason for this is the higher operational inductances and as a consequen-
ce, higher voltage rates rise, which can effect of the VPM.
Table 8-5
Interface overview of the Voltage Protection Module
Type
Number of VPM
120/VPM 200
Number of VPM 200
Dynamik
Signal interface
1
1
PE connection
2
4
Load connection studs, input
3
5
Load connection studs, output
3
5
8 Important Circuit Information
05.08
02.12