Actual signals and parameters
98
35 MTR TEMP MEAS
Motor temperature measurement. See sections Motor temperature
measurement through the standard I/O on page 44 and Motor
temperature measurement through the analog I/O extensionon page
46
35.01 MTR1 TEMP SEL Activates the motor 1 temperature measurement function and selects
the sensor type.
NOT IN USE The function is inactive. 1
1xPT100 The function is active. The temperature is measured with one Pt 100
sensor. Analog output AO1 feeds constant current through the sensor.
The sensor resistance increases as the motor temperature rises, as
does the voltage over the sensor. The temperature measurement
function reads the voltage through analog input AI1 and converts it to
degrees centigrade.
2
2xPT100 The function is active. Temperature is measured using two Pt 100
sensors. See selection 1xPT100.
3
3xPT100 The function is active. Temperature is measured using three Pt 100
sensors. See selection 1xPT100.
4
1..3 PTC The function is active. The temperature is supervised using one to
three PTC sensors. Analog output AO1 feeds constant current through
the sensor(s). The resistance of the sensor increases sharply as the
motor temperature rises over the PTC reference temperature (T
ref
), as
does the voltage over the resistor. The temperature measurement
function reads the voltage through analog input AI1 and converts it
into Ohms. The figure below shows typical PTC sensor resistance
values as a function of the motor operating temperature.
5
35.02 MTR1 TEMP ALM LVL Defines the alarm limit for motor 1 temperature measurement. The
alarm indication is given when the limit is exceeded.
-10…5000 Ohm/
o
C (PTC/
Pt100)
Limit in °C or Ohms.
°C: 35.01 MTR1 TEMP SEL is 1xPT100, 2XPT100, 3XPT100.
Ohm: 35.01 MTR1 TEMP SEL is 1…3 PTC.
1 = 1 °C
35.03 MTR1 TEMP FLT LVL Defines the fault trip limit for motor 1 temperature measurement. The
fault indication is given when the limit is exceeded.
-10…5000 Ohm/
o
C (PTC/
Pt100)
Limit in °C or Ohms.
°C: 35.01 MTR1 TEMP SEL is 1xPT100, 2XPT100, 3XPT100.
Ohm: 35.01 MTR1 TEMP SEL is 1..3 PTC.
1 = 1 °C
35.04 MTR2 TEMP SEL See 35.01 MTR1 TEMP SEL. 1…4
35.05 MTR2 TEMP ALM LVL See 35.02 MTR1 TEMP ALM LVL. 1 = 1 °C
35.06 MTR2 TEMP FLT LVL See 35.03 MTR1 TEMP FLT LVL. 1 = 1 °C
No. Name/Value Description FbEq
100
550
1330
4000
Ohm
t
Temperature Resistance
Normal 0…1.5 kOhm
Excessive >
4 kOhm
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