GESTRA NRS 1-50 Original Installation & Operating Manual Download Page 28

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NRS 1-50 For TWO electrodes - USA - Installation & Operating Manual -

850694-00

Fault indications and troubleshooting

Fault indication

Status

Diagnosis

Function

Next action

Error on evaluation of level

electrode 1, channel 1

Diagnostic LED 1 and

Alarm 1 LED light up

Output contacts open

without a delay.

Signal output 1 closes

without a delay.

Press

button 1

Error on evaluation of level

electrode 2, channel 2

Diagnostic LED 2 and

Alarm 2 LED light up

Output contacts open

without a delay.

Signal output 2 closes

without a delay.

Press

button 2

Error detected in level

switch

Diagnostic LED 3 and

Alarm 1 and 2 LEDs

light up

Output contacts open

without a delay.

Signal outputs 1 and 2 close

without a delay.

Press

button 1 or

button 2

Diagnosis

Indication 1 and action

Indication 2 Error

Corrective action

Alarm 1 LED and

diagnostic LED 1 light up.

Press and hold

button 1

Diagnostic

LED 1

flashes

Error in level electrode 1,

error in level switch,

wiring error,

measuring voltage error.

- Check wiring,

- measure electrode voltages,

- clean level electrode, replace

if necessary,

- replace level switch.

Diagnostic

LED 2

flashes

Error in level electrode 1,

error in level switch,

wiring error.

Diagnostic

LED 3

flashes

External voltage error, boiler

wall has no PE.

Provide shielding and grounding,

connect boiler to PE.

Alarm 2 LED and

diagnostic LED 2 light up,

press and hold

button 2

Diagnostic

LED 1

flashes

Error in level electrode 2,

error in level switch,

wiring error,

measuring voltage error.

- Check wiring,

- measure electrode voltages,

- clean level electrode, replace

if necessary,

- replace level switch.

Diagnostic

LED 2

flashes

Error in level electrode 2,

error in level switch,

wiring error.

Diagnostic

LED 3

flashes

External voltage error, boiler

wall has no PE.

Provide shielding and grounding,

connect boiler to PE.

Alarm 1 and 2 LEDs and

diagnostic LED 3 light up,

press and hold

button 1

or 2

Diagnostic

LED 1

flashes

Processor error, standby

error.

Replace level switch.

Diagnostic

LED 2

flashes

Internal voltage error.

Replace level switch.

Diagnostic

LED 3

flashes

Relay error.

Once the error has been rectified, the level switch reverts to normal operation.
After troubleshooting, please switch the mains supply off and on again after approx. 5 s.

Indications, diagnosis and corrective action

Summary of Contents for NRS 1-50

Page 1: ...Original Installation Operating Manual 850694 00 Level Switch NRS 1 50 For TWO electrodes EN USA English ...

Page 2: ...otes on product liability 10 Function 11 Technical data 12 Rating plate identification 13 Factory default settings 14 Dimensions of the NRS 1 50 15 Important notes 16 Safety information 16 Preparing for installation 17 Installation 18 Electrical connection 19 Supply voltage 19 Connecting the level electrode 19 Connecting the safety circuit 19 Connecting the signal output 20 Wiring diagram of level...

Page 3: ... test 27 Fault indications and troubleshooting 27 Checking the level electrode 29 Measuring level switch voltages 29 Emergency mode 30 Emergency mode for water level limiters 30 Important notes 31 Action against high frequency interference 31 Interlock and interlock deactivation 31 Checking switchpoints 31 Taking out of service 32 Disposal 33 Returning decontaminated equipment 33 UL components 33 ...

Page 4: ... 50 for TWO electrodes First edition BAN 850694 00 09 2021cm Copyright All rights reserved Any misuse particularly reproduction and dissemination to third parties is not permitted The General Terms Conditions of GESTRA AG apply Scope of supply product package NRS 1 50 1 level switch NRS 1 50 1 Installation Operating Manual ...

Page 5: ...full and follow all instructions Please also read the instructions for use of any accessories The Installation Operating Manual is part of the product package Keep it in an easily acces sible location Availability of this Installation Operating Manual Make sure this Installation Operating Manual is always available to the operator If you pass on or sell the equipment to a third party please also h...

Page 6: ...angerous situation that results in death or serious injury WARNING Warning of a dangerous situation that may possibly result in death or serious injury CAUTION Warning of a situation that may result in minor or moderate injury ATTENTION Warning of a situation that results in damage to property or the environment ...

Page 7: ...ating point of the plant The operating point describes the operating parameters within which a plant or boiler is operated in its nominal range In a steam boiler for example these parameters would be output pressure and temperature The design data may be a lot more stringent however A boiler that is operated at 145 psi 10 bar and 356 F 180 C may be designed to withstand a pressure of 870 psi 60 ba...

Page 8: ... below Level electrodes NRG 1 UL 60730 2 15 CAN CSA E60730 2 15 NRG 16 50 NRG 17 50 NRG 19 50 The equipment has been tested and approved for use in the scope governed by the following directives and standards Standards n UL 60730 1 and CAN CSA E60730 1 General Requirements for Automatic Electrical Controls n UL 60730 2 15 and CAN CSA E60730 2 15 Requirements for Automatic Electrical Water Level Se...

Page 9: ...ltage to the plant before performing connection work Check that the plant is not carrying live voltage before commencing work Attempts to repair the equipment will cause the plant to become unsafe The NRS 1 50 level switch may only be repaired by the manufacturer GESTRA AG Only replace faulty equipment with identical equipment from GESTRA AG Basic safety information ...

Page 10: ...red and brought into service by qualified and competent staff Operation Boiler service technician Staff trained by the plant operator Maintenance work Specialist staff Fitting and maintenance work may only be performed by authorized staff who have undergone specific training Refits Specialist staff Persons trained by the plant operator to work with pressure and temperature Notes on product liabili...

Page 11: ... close without a delay An alarm is also triggered if faults occur in a level electrode and or the electrical connection If the level electrode is installed in a level pot outside the boiler make sure the connection pipes are sufficiently large The manufacturer recommends connection pipes of 1 57 in 40 mm for steam and 3 94 in 100 mm for water If smaller connection pipes or fittings are used these ...

Page 12: ...rial base of black polycarbonate front of gray polycarbonate Wire size 1 x AWG12 4 0 mm2 solid or 1 x AWG14 2 5 mm2 stranded with sleeve acc to DIN 46228 or 2 x AWG16 1 4 mm2 stranded with sleeve acc to DIN 46228 Terminal strips can be removed separately Terminal box attachment Mounting clip on support rail TH 35 EN 60715 Electrical safety Pollution degree 2 overvoltage category II according to UL...

Page 13: ... Disposal information Type approval number Ambient tem perature Sen sitivity Jumper provid ed by customer Safety circuit Fuse provided by customer Type designation Mains voltage Protection Manufacturer Wiring diagram Safety information Disposal information Type approval number Ambient tem perature Sen sitivity Jumper provided by customer Safety circuit Fuse provided by customer Fig 1 Fig 2 NRS 1 5...

Page 14: ... Manual 850694 00 Factory default settings Level switch NRS 1 50 The level switch is delivered with the following factory default settings n Off delay 3 s n Configuration Operation with two NRG 1 50 level electrodes Code switches 4 and 5 in OFF position Fig 3 ...

Page 15: ...erminal strip 2 Lower terminal strip 3 Fastening screws cross recess head screw M3 4 Code switch for switching level electrode 1 or 2 on off 5 Code switch for switching level electrode 1 or 2 on off 6 Terminal box 7 Support rail TH 35 EN 60715 Key The code switches are accessed by undoing the right and left fastening screws and detaching the lower terminal strip 1 2 3 4 5 6 7 3 94 in 100 mm 4 72 i...

Page 16: ... undergone specific training Danger The terminal strips of the equipment are live during operation There is a risk of serious injury due to electric shock Always cut off power to the equipment before working on the terminal strips installation removal connecting cables Attention The rating plate indicates the technical features of the equipment Do not bring into service or operate any equipment th...

Page 17: ...n the technical data see page 1712 Do not operate the equipment if the temperature is below freezing At temperatures below freezing use a suitable heat source e g control cabinet heater etc Connect all parts of the plant to a central grounding point to prevent equalizing currents Use UV resistant cable ducts for routing the connecting cable Take further measures to protect the equipment from light...

Page 18: ...tallation Operating Manual 850694 00 Installation ATTENTION Incorrect installation can lead to malfunctions in the plant or the level electrode The NRS 1 50 level switch snaps onto a TH 35 EN 60715 support rail in a control cabinet Fig 3 7 ...

Page 19: ... as a water level limiter please connect the output contacts of the two monitoring channels by adding a wire jumper between terminals 24 and 26 Provide the output contacts with a slow blow T1A fuse Connecting the safety circuit Note n In the event of an alarm the NRS 1 50 level switch interlock does not take place automatically If the installation requires an interlock this must be implemented in ...

Page 20: ...electrical isolation Attention n Provide the NRS 1 50 level switch with an external 0 5A fuse n Connect the shields to terminals 5 and 13 and to the central grounding point CGP in the control cabinet n Provide the safety circuit with a slow blow T1A fuse to protect the switching contacts n Switching off inductive loads produces surges that can have a major adverse effect on open and closed loop co...

Page 21: ...3 L M0 5A N 1 2 3 Electrical connection Fig 4 Wiring diagram of level switch NRS 1 50 8 9 0 9 a 0 c c 8 Supply voltage 9 Signal output 1 2 for external alarm 24 V DC 100 mA semiconductor output 0 Safety circuit input and output a Jumper provided by customer c Level electrode NRG 1 50 CGP Central grounding point in control cabinet Key CGP CGP NRG 1 50 NRG 1 50 ...

Page 22: ...nst second faults with automatic prevention of interlock deactivation in the event of malfunction The Reset button is acting to the external lockout reset function Fig 5 27 16 1 2 3 4 5 6 7 8 17 18 19 20 21 22 23 24 9 25 10 26 11 12 28 13 29 14 30 15 Test S1 Reset button 24VDC K1 Signal 1 K2 Signal 2 GND GND Reset OUT Reset IN NRS 1 50 51 ...

Page 23: ...850694 00 d d e e f f d d e f e f d d g e f f Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 Fig 11 Electrical connection Example switching combinations e e d Level electrode s NRG 1 50 e Level switch NRS 1 50 Key f Safety circuit g Level switch NRS 1 50 for advance low water alarm ...

Page 24: ...on Electrically heated steam boilers require only one water level limiter If the plant operator requires greater availability from the steam boiler plant this can be achieved by installing two mutually independent NRG 1 50 NRS 1 50 combinations in the steam boiler For further uses please refer to the regulations in your country Figure 8 Combination consisting of 1x NRG 1 50 level electrode plus NR...

Page 25: ...Fig 3 2 3 n Set code switch 4 or 5 to ON position depending on which electrode you wish to deactivate n Put the terminal strip back on and tighten the fastening screws n Switch the mains supply back on The equipment restarts Code switch 4 Code switch 5 S 1 S 2 S 1 S 2 Level electrode 1 active OFF OFF Level electrode 1 passive ON ON Level electrode 2 active OFF OFF Level electrode 2 passive ON ON 4...

Page 26: ...ter below low water LW switchpoint according to sight glass but red level electrode LED 1 2 not lit Safety circuit closed Electrode rod s too long Cut electrode rod s in line with LW switchpoint For internal installation Upper pressure relief hole in protective tube is missing or obstructed Check level electrode installation and make sure that the level in the protective tube corresponds to the ac...

Page 27: ... 1 2 flashing Alarm simulation in channel 1 or 2 Off delay in progress signal outputs 1 2 close without a delay Red level electrode LED 1 2 lit Delay has elapsed output contacts open Signal outputs 1 2 closed Test is complete Operation alarm and testing Indicators and operation Attention Please check the following before fault diagnosis Supply voltage Is the level switch supplied with the voltage ...

Page 28: ...ean level electrode replace if necessary replace level switch Diagnostic LED 2 flashes Error in level electrode 1 error in level switch wiring error Diagnostic LED 3 flashes External voltage error boiler wall has no PE Provide shielding and grounding connect boiler to PE Alarm 2 LED and diagnostic LED 2 light up press and hold button 2 Diagnostic LED 1 flashes Error in level electrode 2 error in l...

Page 29: ...el electrodes Measuring level switch voltages Note n The self test of the NRS 1 50 level switch cyclically reduces U2 4 10 12 possibly to 0 V U2 3 10 11 fault immersed alarm U2 4 10 12 2 U2 4 10 12 2 U3 4 11 12 U2 4 10 12 U3 4 11 12 exposed immersed c Level electrode NRG 1 50 CGP Central grounding point in control cabinet Key 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 1 2 3 1 2 3 U2 4 U2 3 U3 4 U10 12 U1...

Page 30: ... n Set code switch 4 or 5 to ON position depending on which electrode you wish to deactivate n Put the terminal strip back on and tighten the fastening screws n Switch the mains supply back on The equipment restarts Attention n Enter the start of emergency mode in the boiler log n Maintain constant supervision when operating the plant in emergency mode n Replace the faulty level electrode immediat...

Page 31: ...l safety circuit It is important that the interlock is not deactivated when the level switch signals a malfunction to the diagnostic LEDs or the signaling outputs In order to guarantee Class C function with second fault protection in accordance with UL 60730 1 both signaling outputs must be monitored during interlock deactivation To conform with ASME CSD 1 two low water level limiters are required...

Page 32: ...eed as follows n Switch off the mains supply and switch off the voltage to the equipment n Unscrew the fastening screws on the right and left and detach the upper and lower terminal strips Fig 3 1 2 3 n Release the white slider holder at the bottom of the unit and detach the unit from the support rail ...

Page 33: ...ly if accompanied by a completed and signed return note and also a completed and signed declaration of decontamination The return confirmation and declaration of decontamination must be attached to the outside of the return package as processing will otherwise be impossible and the products will be returned to the sender at their expense Please proceed as follows 1 Let GESTRA AG know about the ret...

Page 34: ...34 NRS 1 50 For TWO electrodes USA Installation Operating Manual 850694 00 For your notes ...

Page 35: ...35 NRS 1 50 For TWO electrodes USA Installation Operating Manual 850694 00 For your notes ...

Page 36: ...38 00 GESTRA AG Bremen GESTRA AG Münchener Straße 77 28215 Bremen Germany Tel 49 421 3503 0 Fax 49 421 3503 393 e mail info de gestra com Web www gestra com You can find our authorized agents around the world at www gestra com ...

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