Functional Software description
DCS 500 Software Description 69
Note
:
HIGH VALUE and LOW VALUE parameters in AI function blocks
are not in use when AI output is defined in °C or in ohms (Ω).
Jumper settings of SDCS-IOB3-card are made such that the input
voltage range in both channels is +/-10V.
Motor Protection
by means of the
switch
DC-motor temperature protection can also be supervised by means
of the temperature switch in the DC-motor. The contact of the
switch opens in a certain temperature. The connection to the soft-
ware is by means of the digital input,and the input signal [KLIXON
IN] (1404) is used in software. When the input state changes from 1
to 0, the overtemperature trip will be activated.
[TEMP IN]
TEMP ALARM L
1401
1402
C:
TEMP FAULT L
1403
C:
MOTOR 1 PROTECTION
MODEL1.CURR
1406
C:
MODEL1.ALARM L
1407
C:
MODEL1.TRIP L
1408
C:
MODEL1.TC
1409
C:
T20
SP
MOT1 CALC TEMP
11402
[KLIXON IN]
1404
MODEL1.SEL
1405
C:
O1
DIxx
O2
107xx
107xx
T20
SWHW
SDCS-
IOx-x
M
Figure 48 Overtemperature protection by means of the thermal
switch.
Motor thermal model The DC-motor must be always protected against overtemperature.
If a direct temperature measurement of the motor is not available,
the thermal model of the motor can be used when the current limits
of the drive are set higher than the nominal motor current.
In the DCS500B there are two thermal models available that can be
used at the same time. By means of input signal [MOTOR2] (913)
the measured armature current is directed to the correct model.
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