15
NRR 2-52, NRR 2-53, URB 55 - Installation & Operating Manual -
850646-00
Technical data - NRR 2-52, NRR 2-53
Supply voltage
■
24 V DC +/-20 %
Power consumption
■
Max. 5 VA
Current input
■
Max. 0.3 A
Required external fuse
■
0.5 A M
Input/output
■
Interface for data exchange with the URB 55 visual display and operating unit
Inputs
■
1 x analogue input for potentiometer 0 - 1000 Ω, 2-wire connection
(display of valve position, NRR 2-52 only)
■
1 x analogue input IN 2, 4 - 20 mA (feedwater flowrate) (optional)
■
1 x analogue input IN 3, 4 - 20 mA (steam flowrate) (optional)
■
1 x digital input for alarm signal (for the control centre)
Outputs of NRR 2-52 *
1 x MIN / 1 x MAX alarm
■
2 x volt-free relay contacts (changeover relays) **
■
Maximum switching current - 8 A at 250 V AC / 30 V DC - cos
ϕ
= 1 **
Outputs of NRR 2-53 *
2 x MIN / 2 x MAX alarm
■
4 x volt-free relay contacts (changeover relays), MIN1/MAX1 alarm **
■
Maximum switching current - 8 A at 250 V AC / 30 V DC - cos
ϕ
= 1 **
or
1 x MIN1 / 1 x MAX1 alarm and
2 x pump enable (ON/OFF) - (MIN2/MAX2 = enable pump 1/pump 2)
■
2 x volt-free relay contacts (changeover relays), MIN1/MAX1 alarm **
■
2 x potential-free relay contacts (changeover relays), MIN2/MAX2 enable pump 1/2 **
■
Maximum switching current - 8 A at 250 V AC / 30 V DC - cos
ϕ
= 1 **
* Inductive loads must have interference suppression (RC combination) as per the manufacturer's
specification
** Contact material AgNi0.15, AgSnO2
Off delay of MIN/MAX alarm outputs
■
Factory default setting 3 seconds.
