GESTRA NRR 2-52 - Electrical Connection of the NRR 2-52, NRR 2-53; Connecting the 24 V DC Power Supply; Connecting the Output Contacts; Notes on Connecting Inductive Loads

32 NRR 2-52, NRR 2-53, URB 55 - USA- Installation & Operating Manual - 850698-00
Electrical connection of the NRR 2-52, NRR 2-53
Connecting the 24V DC power supply
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The NRR 2-52 or NRR 2-53 level controller is supplied with 24 V DC.
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A safety power supply unit that delivers a Safety Extra Low Voltage (PELV / CLASS2) must be
used to supply the equipment with 24V DC.
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Use a 0.5A medium time-lag fuse as an external fuse.
Connecting the output contacts
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Connect the outputs as shown in the wiring diagrams in Fig. 18 / Fig. 19.
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Only use the terminals specified in the wiring diagrams.
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Use a 2.5A slow blow fuse to protect the switching contacts.
Notes on connecting inductive loads
All connected inductive loads, such as contactors and actuators, must have interference suppres-
sion using RC combinations in accordance with the manufacturer's specification.
Connecting the level electrode/level transmitter
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Use a shielded, multi-core TC-ER control cable with minimum wire size AWG18, e.g., OELFLEX
CONTROL TM CY 5G1.
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Maximum cable length = 328ft (100m).
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Connect the shield as shown in the wiring diagrams.
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Route connecting cables separately from power cables.
Connecting the actual value output OUT1 and analog output OUT2 (4 - 20 mA)
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Please note the load resistance of max. 500 W.
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Use a shielded, multi-core TC-ER control cable with minimum wire size AWG18, e.g., OELFLEX
CONTROL TM CY 3G1.
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Maximum cable length = 328ft (100m).
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Route connecting cables separately from power cables.
Connecting the digital input (terminals 29/30)
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Alarm signal displayed on the alarm page of the URB 55. (Ext. alarm input, see page 32).
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Maximum cable length = 98 ft (30 m).
Connecting the potentiometer (0 - 1000 W)
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Use a shielded, multi-core TC-ER control cable with minimum wire size AWG18, e.g., OELFLEX
CONTROL TM CY 3G1.
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Maximum cable length = 328ft (100m).
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Route connecting cables separately from power cables.