Motortech VariSCR, Operating Manual, Page: 20 / 112

4 Product Description
20 Rev. 06/2020
Feature Value
Output for control signal
for pump speed – Open collector
– Voltage: 18 V DC to 32 V DC
– PWM: 100 Hz
– Current: Max. 30 mA
Input for feedback signal
for pump speed – NPN with pull-up resistor 12 kΩ
– Input voltage up to 32 V DC
– Frequency: 0 Hz to 500 Hz (square wave signal)
Electrical Data for Connection of the Dosing Unit
The connections of the dosing unit have the following electrical data:
Feature Value
Power supply of the
integrated sensors 5 V DC; max. 30 mA
Analog voltage input for
AdBlue
® pressure
– Permissible voltage: 0 V DC to 4.5 V DC
– Measuring range: 0 bar to +19.5 bar abs. (0 psi to
+282.8 psi abs.)
– Measuring tolerance: 2 % of measured value
Analog voltage input for
AdBlue
® temperature
– Permissible voltage: 3.3 V DC to 0.5 V DC
– Measuring range: –50 °C to +150 °C (–58 °F to +302 °F)
– Measuring tolerance:
+/–4 °C (in the range 0 °C to +90 °C)
+/–7.2 °F (in the range +32 °F to +194 °F)
Connection for the dosing
valve PWM: 5 kHz, 18 V to 32 V; max. 1 A
Connection for the heating
resistor Power supply: 18 V DC to 32 V DC; max. 2 A
Electrical Data of the Connections for the Sensors on the Catalytic Converter
The connections of the sensors have the following electrical data:
Feature Value
Power supply of the
sensors 18 V DC to 32 V DC; max. 1.5 A