7
NRR 2-52, NRR 2-53
Supply voltage
24 VDC +/– 20%
Fuse
external 0.5 A (semi-delay)
Power consumption
5 VA
Connection of level electrode / level transmitter
(switch-selectable)
1 input for level electrode NRG 21-.. or NRG 26-21, with 3 poles and screen or
1 analogue input 4-20 mA, e. g. for level transmitter NRGT 26-1, with 2 poles and screen
Supply voltage of 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 flowrate) (optional)
1 analogue input 4-20 mA (feedwater flowrate) (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 seconds (MIN 1, MIN 2 / MAX 1, MAX 2 alarm)
1 analogue output 4-20 mA, max. load 500 ohm (manipulated variable Y).
Provide inductive loads with RC combinations according to manufacturer's specification to ensure
interference suppression
NRR 2-52, NRR 2-53: 1 analogue output 4-20 mA, max. load 500 ohm (e. g. for actual value indication)
(optional)
Indicators and adjustors
1 tri-colour LED indicator (start-up = amber, power ON = green, malfunction = red)
1 code switch with four poles for configuration
Housing
Housing material: base: polycarbonate, black; front: polycarbonate, grey
Conductor size: 1 x 4,0 mm² solid per wire or
1 x 2.5 mm
2
per stranded wire with sleeve to DIN 46228 or
2 x 1.5 mm
2
per stranded wire with sleeve to DIN 46228 (min.
∅
0.1 mm)
terminal strips can be detached separately
Fixing of housing: Mounting clip on supporting rail TH 35, EN 60715
Electrical safety
Pollution degree 2 for installation in control cabinet with protection IP 54, completely insulated
Protection
Housing: IP 40 to EN 60529
Terminal strip: IP 20 to EN 60529
Technical data
Summary of Contents for NRR 2-52
Page 37: ...37 For your Notes ...
Page 38: ...38 For your Notes ...
Page 39: ...39 For your Notes ...
