Flowserve NRA 1-3 - Manual (Page 12)

Wiring
Connecting line of temperature sensor for detecting the temperature of the installation
Use screened three-core cable (e. g. Ölflex 0 CH, manufactured by LAPP, 3 x 0.5 mm²) for connecting
the sensor. Max. cable length between temperature sensor and test station NRA -3: 50 m. Connect
screen to the sensor.
Connecting line of measuring electrodes
NRG 16-19
The measuring electrode comes with a m long connecting line and can be directly plugged into
the test station NRA -3. An extension is possible with screened two-core cable, e. g. Ölflex 0 CH,
manufactured by LAPP, x 0.5 mm². Max. cable length between temperature sensor and test station
NRA -3: 50 m. Connect screen to the distribution substation.
NRG 16-27, NRG 16-28
Use screened five-core cable (e. g. Ölflex 0 CH, manufactured by LAPP, 5 x 0.5 mm²) for connecting
the electrode. Max. cable length between measuring electrode and test station NRA -3: 50 m.
Connect screen to the connecting coupler.
Wiring
NRA 1-3a
With the base part taken off:
. Loosen the cable glands and pull the connecting lines through the glands.
. Remove approx. 3 cm of the end insulation of the cable and the screen.
3. Connect the wires to the terminal strips (rear of base part) according to the wiring diagram and use
a cable tie for securing the cable bundle to prevent misalignment.
4. Tighten cable glands to achieve a good seal. Use sealing plugs to seal off cable glands that are not
used.
NRA 1-3e
. Remove approx. 30 mm of the cable end insulation.
. Connect the wires to the terminal strips (rear of base part) according to the wiring diagram.
Attention
n
To protect the output relays provide the circuit with a T .5 A (slow blow) fuse.
n
To suppress interferences provide connected contactors with RC combinations as
specified by the manufacturer.
n
Install an easily accessible disconnector that serves as means of isolation from the
electrical supply near the test station (EN 600-).
n
Label this disconnector as means of isolation for the test station.