Specifications

E - 2 Protections Ver: 0002
PROTECTIONS AGAINST OVERCURRENT AND
OVERTEMPERATURE ON DRIVES AND MOTORS
This document describes the various limitations and monitoring that the drive carries out to
protect the servo system against excessive temperature and current.
1. PROTECTIONS OF THE DRIVE
The elements setting the current limit through the drive are the power semiconductors IGBTs.
The range of Fagor drives carry IGBTs whose maximum current (I
IGBT
) ranges between 8A
and 150A as shown in the table below.
The IGBTs of the drive may be damaged if:
- The current exceeds the permitted peak value. To prevent this, the drive limits the current
command it will attend to (i
command
) and watches the real instantaneous current (i
real
). See
section 1.1 in this Appendix.
- The drive works with over-demanding duty cycles that cause the rms current to exceed
the maximum permitted. This causes the IGBTs to overhear. To prevent this, there are
two protections:
- Some thermal sensors located on the heat-sink watch the actual temperature of
these power semiconductors. See section 1.2.
- The drive estimates this rms current with the integral of the I
2
t product. This
gives an estimate of the temperature of the IGBTs. See section 1.3.
,DPS,DXA
DCS,DCA
80.151.152.153.105.257.2
-01.3
0
-51.3
0
I
TBGI
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