ELPRO 805U-E User Manual download pdf (Page 38)

3.18 Setup of a Nivel220 (RS485) with long cables

Cables supplied by Leica Geosystems and CAT cables

General information



For the installation of the cables of the Nivel220 sensors, the general rules for the installation of electrical wiring

apply.

 Avoid sharp bends and lay the cable in large loops within the range of rotating or moving parts.

 When installing the cables, please observe the already existing installation of electric system.

 After having completed the installation, please drive through all possible positions in order to make sure that the

cables are not touching, stretched or even squeezed by any moving parts.

Please consider that a well-planned and thoroughly carried out electric installation does not only protect the cables against

damages, but also looks professional.

Sensor auxiliary supply

Power for the Nivel220 sensor must be supplied externally. The power is connected to the sensor using a LEMO cable.

The auxiliary supply voltage at the Nivel220 sensor must be within the permissible range. Refer to "Nivel 200 User Manual". The

correct operation of the sensor cannot be guaranteed when the supply voltage is not within this range and it can be damaged

by overvoltages. For the voltage drop along long supply cables take into account and, if necessary, correspondingly increase the

voltage at the supply end. The voltage drop is given by the following equation:

voltage drop [V] = resistance per m [

Ω/m] * 2 * cable length [m] * current [A]

It can be assumed that the voltage drop is varying should the current through the sensor appear to fluctuate. A Nivel220

requires typically 50mA. Refer to "Nivel 200 User Manual".

Use the Leica Geosystems power supply recommended by Leica Geosystems to ensure the correct functionality of the Nivel220

sensor.

Voltage drop computation

225 m 45 m 45 m

Power supply

voltage drop [V] = 0.1 [

Ω/m] * 2 * 225 [m] * 0.15 [A] = 6.75 [V]

voltage drop [V] = 0.1 [

Ω/m] * 2 * 45 [m] * 0.10 [A] = 0.90 [V]

voltage drop [V] = 0.1 [

Ω/m] * 2 * 45 [m] * 0.05 [A] = 0.45 [V]

total amount voltage drop = 8.10 [V]

100 mA 50 mA

150 mA

220V

N1 N3N2

12.00 V 5.25 V 4.35 V 3.90 V

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ELPRO 805U-E User Manual Page 38