Gestra URS 61 Safety Control Unit

Data sheet 819911-01 Issue: 11/22
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Safety Control Units
URS 60
URS 61
Description
Technical data
URS 60 and URS 61 safety control units can be used in combination with various safety sensors as safety limiters
for steam boiler and water boiler systems.
The equipment can be used as:
Supply voltage
■ Low-level limiters, in combination with the NRG 1x-60/
NRG 26-61 level electrode.
Low-level limiters switch off the heating when the water drops below the set minimum level.
■ Max. 7 W
■ Safety high-level limiters, in combination with the NRG 1x-61/NRG 26-61 level electrode.
Safety high-level limiters switch off the feedwater supply when the feedwater rises above the set maximum level.
Internal fuse
■ Conductivity limiters, in combination with the LRG 1x-6x conductivity electrode.
Conductivity limiters switch off the heating if the set maximum conductivity is exceeded.
■ Interface for CAN bus to ISO 11898, CANopen, insulated
■ Safety temperature monitors/limiters, in combination with the TRV 5-60 temperature transmitter.
Safety temperature limiters or monitors switch off the heating when the maximum admissible temperature is
reached.
The above functions may be combined.
Viewing and operation take place using the URB 60 or SPECTORcontrol operating terminals.
Function The URS 60/URS 61 safety control unit cyclically evaluates data telegrams from up to four safety sensors, see “Admissible accessories..” table.
■ 24V DC +/-20% Power consumption Current input ■ Max. 0.3 A ■ T2A Input/output
Safety circuit output ■ 2 volt-free relay contacts, connected externally in
series. Contact material AgNi ■ Maximum switching current at switching voltages of
24V AC/DC, 115V AC and 230V AC: ohmic/inductive 6 A ■ Connected contactors must have interference suppression (RC combination) as per the manufacturer's
specifications Required external fuse for the safety circuit ■ T2A or T1A for (EN 12952), 72 hrs. of operation
Signal output ■ 4 PhotoMOS outputs for external signalling, either with or without a delay
The data are transferred via ISO 11898 CAN bus using the CANopen protocol, and saved.
■ 24V DC, max. current load 100 mA, NO characteristic
The safety functions are monitored by cyclical self-tests. The two integrated relays are switched off in the event of alarms or
errors. Function tests and failure diagnosis can be performed using the control unit or an operating terminal.
■ 4 opto-coupler inputs for external test triggering, high active, 24V DC +/- 20%
Behaviour in the event of alarms When level, temperature or conductivity alarms occur, both
output contacts open after a power-off delay and this interrupts the safety circuit (fail-safe position). The safety control unit does not lock independently; this function must
be implemented in the downstream circuit. The URS 60 or
URS 61 can only activate one safety circuit (heating or pump) at any one time.
■ Factory default setting 3 seconds.
The safety circuit is interrupted without a delay if the following fault indications occur:
■ 3 x yellow LEDs for indicating internal errors and ­external sensor errors
■ Fault in sensors (negative self-test, excessively high temperature in terminal box)
■ 1 x 10-pole code switch for setting the number of ­limiters, the delay and baud rate
■ Fault in control unit (negative self-test) ■ Communication failure
Test input
Output relay switch-off delay ■ Option of 10 seconds or 15 seconds Indicators and controls
■ 4 x buttons for operation/initiating test function in sensor ■ 4 x green LEDs for indicating active channels
■ 4 x red LEDs for indicating a malfunction/alarm
Protection class ■ II double insulated
IP rating to EN 60529 ■ Terminal box: IP 40 ■ Terminal strip: IP 20