GESTRA NRA 1-3, Оригинальная инструкция по установке

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Electrical connection
Connecting line of temperature sensor for detecting the plant temperature
For the connecting line use screened three-core cable, e.g. Ölflex 110 CH, manufactured by Lapp,
3 x 0.5 mm². Max. cable length between temperature sensor and test station NRA 1-3: 100 m.
Please connect screen to sensor.
Connecting line of measuring electrodes
NRG 16-19
The measuring electrode comes with a 2 m long connecting cable and can be directly connected to the
test station NRA 1-3. To extend the cable use screened two-core cable, e.g. Ölflex 110 CH, manufac-
tured by Lapp, 2 x 0.5 mm². Max. cable length between measuring electrode and test station NRA 1-3:
100 m. Please connect screen to intermediate distribution frame.
NRG 16-27, NRG 16-28
For the connecting line use screened five-core cable, e.g. Ölflex 110 CH, manufactured by Lapp,
5 x 0.5 mm². Max. cable length between measuring electrode and test station NRA 1-3: 100 m.
Please connect screen to connector.
Only for NRA 1-3 CAN: Connection of supply voltage
The equipment is supplied with 24 V DC and fused with an external slow-blow fuse 200 mA. Please use
a safety power supply unit with safe electrical isolation.
The power supply unit must be electrically isolated from dangerous contact voltages and must meet at
least the requirements on double or reinforced isolation according to one of the following standards:
DIN EN 50178, DIN EN 61010-1, DIN EN 60730-1 or DIN EN 60950.
Only for NRA 1-3 CAN: CAN bus connection, length and size of cables
Note that screened multi-cored twisted-pair control cable is required as Bus line, e. g. UNITRONIC
®
BUS
CAN 2 x 2 x .. mm
2
or RE-2YCYV-fl 2 x 2 x .. mm
2
.
Cable length Number of pairs and conductor size [mm
2
]
125 m 2 x 2 x 0.34
250 m 2 x 2 x 0.5
335 m 2 x 2 x 0.75
500 m
available on demand (depends on bus configuration)
1000 m
Wire terminal strip
2
in accordance with the wiring diagram.
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