Bộ điều khiển mức nước Gestra NRR 2-52, NRR 2-53 và màn hình hiển thị mức nước URB 50

Technical data

Supply voltage

24 VDC, + / –20 %

Fuse

external 0.5 A (semi-delay)

Power consumption

5VA

Connecting level electrode, level transmitter

(switch-selectable)

1 input for level electrode NRG 21-.. and NRG 26-21, with 3 poles and screen or
1 analogue input 4-20 mA, e. g. for level transmitters NRGT 26-., with 2 poles and screen.

Supply voltage for level electrode

12 VDC

Input/output

Interface for data exchange with operating & display unit URB 50

Inputs

1 analogue input, potentiometer 0 – 1000 Ω,
Two-wire connection (indication of valve position, only NRR 2-52)
1 analogue input, 4-20 mA (steam owrate) (optional)
1 analogue input, 4-20 mA (feedwater owrate) (optional)

Outputs

NRR 2-52: 2 volt-free change-over contacts,
8 A 250 V AC / 30 V DC cos φ = 1 (control valve). 2 volt-free change-over contacts,
8 A 250 V AC / 30 V DC cos φ = 1, De-energizing delay: 3 seconds (MIN/MAX alarm).

NRR 2-53: 4 volt-free change-over contacts,
8 A 250 V AC / 30 V DC cos φ = 1 De-energizing delay: 3 sec. (MIN/MAX alarm)
1 analogue output 4-20 mA, max. load 500 ohm (manipulated variable Y)

Provide inductive loads with RC combinations according to manufacturer’s speci cation to ensure interference suppression.

NRR 2-52, NRR 2-53:

1 analog output 4-20 mA, max. load 500 ohm (actual value) (optional)

Indicators and adjusters

1 tri-colour LED indicator (start-up = amber, power ON = green, malfunction = red)
1 code switch with four poles for con guration

Housing

Housing material: base: polycarbonate, black
Front: polycarbonate, grey.
Terminal strips separately detachable.
Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715

Electrical safety

Pollution degree 2.

Weight

approx. 0.5 kg

Further conditions:

Ambient temperature

when system is switched on: 0 … 55 °C, during operation: -10 … 55 °C

Transport temperature