Flowserve NRA 1-3 Manual de usuario Pagina 12

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Wiring
Connecting line of temperature sensor for detecting the temperature of the installation
Use screened three-core cable (e. g. Ölflex 110 CH, manufactured by LAPP, 3 x 0.5 mm²) for connecting
the sensor. Max. cable length between temperature sensor and test station NRA 1-3: 50 m. Connect
screen to the sensor.
Connecting line of measuring electrodes
NRG 16-19
The measuring electrode comes with a 2 m long connecting line and can be directly plugged into
the test station NRA 1-3. An extension is possible with screened two-core cable, e. g. Ölflex 110 CH,
manufactured by LAPP, 2 x 0.5 mm². Max. cable length between temperature sensor and test station
NRA 1-3: 50 m. Connect screen to the distribution substation.
NRG 16-27, NRG 16-28
Use screened five-core cable (e. g. Ölflex 110 CH, manufactured by LAPP, 5 x 0.5 mm²) for connecting
the electrode. Max. cable length between measuring electrode and test station NRA 1-3: 50 m.
Connect screen to the connecting coupler.
Wiring
NRA 1-3a
With the base part taken off:
1. Loosen the cable glands and pull the connecting lines through the glands.
2. Remove approx. 32 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
1. Remove approx. 30 mm of the cable end insulation.
2. 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 2.5 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 61010-1).
n Label this disconnector as means of isolation for the test station.
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