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Spirax Sarco LC2610, Installation And Maintenance Instructions Manual, Page: 36 / 40

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Spirax Sarco LC2610 Installation And Maintenance Instructions Manual Download Page 36

IM-P402-93  AB Issue 7

36

9. Maintenance

Many faults which occur on commissioning are found to be due to incorrect wiring or setting up,

so we recommend that a thorough check is first carried out should there be a problem.

If this has been done and the controller is still not working, make the following checks:-

10.1 Display not lit - check:

-

Correct voltage selected.

-

Live supply connected.

-

Neutral connected.

-

Fuse not blown.

10.2 If a PA20 amplifier is used, check:

-

Probe output voltage is between 0 V and 6 Vdc across terminals 7 and 9 of the controller
(or terminal 2 and earth on the probe).

-

Probe supply voltage is between 15 Vdc and 35 Vdc across terminals 7 and 8 of the
controller (or terminal 1 and earth on the probe).

-

Preamplifier sensitivity is correctly set. (See PA20 IMI).

10.3 If a 4 - 20mA input is used, check:

-

Loop connections not reversed - (polarity incorrect).

10.4 Valve fails to function correctly when proportional

(modulating) control is selected (EL5600):
-

Check that the potentiometer wiring is correct. Voltage across terminals 1 and 2 of the
controller should vary from 0 V (valve closed) to 2.1 Vdc (valve open). This voltage can also
be measured across terminals 14 and 15 of the potentiometer.

10.5 To check that the alarms are functioning:

-

Deliberately set them above / below the actual water level.

10.6 To check that the feedwater valve and relays are operating:

-

Select 'Manual' and use the '<' and '>' buttons to actuate the valve.

10.7 Display indicates both ALARM HIGH and ALARM LOW at

the same time:
-

Alarm levels incorrectly set -
Both high and low alarms must be set to operate outside the control band.
or:-
If the LVLINPUT O/RNGDET feature has been selected:-

-

Level input out of range -
This is most likely to be due to a faulty connection.

The LC2610 needs no special servicing or maintenance. Boiler water level controls and alarms

do, however, need regular testing and inspection. General guidance for the UK is given in

Health and Safety Executive Guidance Note PM5.
For specific instructions for Spirax Sarco systems see separate literature.

10. Fault finding

Archive

Summary of Contents for LC2610

Page 1: ...n 2 General product information 3 Typical applications 4 Setting the voltage 5 Mechanical installation 6 Electrical installation and wiring diagrams 7 Menu familiarisation 8 Commissioning change mode 9 Maintenance 10 Fault finding 11 Settings table 12 Simplified menu flow chart LC2610 50 LEVEL 50 VALVE Printed in the UK Copyright 2004 A r c h i v e ...

Page 2: ...ow alarm status A high water alarm may be part of the water level control or a separate system An independent high water alarm system must be fitted if it is considered a safety requirement In this case the relays must simultaneously isolate the feedwater supply and the boiler heat supply at high alarm status All boiler water limiters alarms require regular functional testing A suitable water trea...

Page 3: ... be long enough to sense over the complete level range The LC2610 incorporates automatic compensation for the wave motion that can occur in steam boilers The wave height is measured approximately every 2 minutes and an appropriate dead band is included in the control loop to minimise valve movement In addition the LC2610 can accept signals from steam and water meters for two and three element cont...

Page 4: ... control the level of a boiler tank or vessel by operating a pump valve or solenoid The following diagrams show some typical applications 3 1 On off control Pump control Two alarm outputs 4 20 mA level output Note A solenoid valve may be used instead of a pump Fig 2 A r c h i v e ...

Page 5: ...ol Modulating valve control using valve motor drive or 4 20 mA control signals Two alarm outputs 4 20 mA level output Note The 4 20 mA level output is only available when the LC2610 is configured for valve motor drive systems Fig 3 A r c h i v e ...

Page 6: ...e or 4 20 mA control signals Two alarm outputs 4 20 mA level output Probe mounted in boiler in protection tube or in external chamber Feedback from steam meter Feed forward from water meter Note The 4 20 mA level output is only available when the LC2610 is configured for valve motor drive systems Fig 4 A r c h i v e ...

Page 7: ...fit the two connector sockets Fuse The fuse is next to the mains switch as shown Fuse type The controller is fitted with an internal 20 mm cartridge 100 mA anti surge T fuse For the UL version replacement fuses must be UL recognised to maintain the integrity of the approval The controller is supplied with the voltage switch set to 230 V The controller is suitable for operation at the following vol...

Page 8: ... Additional sealing is also required between the LC2610 and the panel to maintain the IP65 rating LC2610 terminals must be enclosed within the panel For the UL version this must be a Type 1 enclosure The LC2610 fits into a 137 x 67 mm panel cut out and is retained by the two clips and screws supplied Ensure that the panel has sufficient depth to install the LC2610 and its wiring including the spac...

Page 9: ...m earth Input Level input 9 8 7 6 5 4 3 2 1 6 Electrical installation and wiring diagrams 6 1 General wiring diagram All relays shown in the power off position Note It is essential to select the correct sensitivity on the PA20 preamplifier see the PA20 Installation and Maintenance Instructions for details Tighten the terminals to 0 8 N m 7 lbf in High relay alarm Low relay alarm Control relay Sele...

Page 10: ...bling should be installed in accordance with BS 6739 Instrumentation in process control systems Installation design and practice or local equivalent For the US and Canadian markets the controller must be wired in accordance with the National and Local Electrical code NEC or Canadian Electrical Code CEC Note Screened high temperature 3 core 1 mm 18 16 AWG copper cable is required for the probe wiri...

Page 11: ...s product has double insulation and therefore does not require a protective earth A functional earth is used in order for the product to operate In this application the earth tank boiler shell is used as the common of the probe preamplifier It also provides a sink drain for any electrical interference Ensure that the screen is connected to the common of the LC2610 terminal 7 and to the earth termi...

Page 12: ... transmitter input The earth terminal is internally connected to the PA20 body and earthed by the LP20 probe Do not connect this earth terminal to any other earths Fig 10 Loop powered 4 20 mA input e g Two wire differential pressure transmitter 4 20 mA transmitter wiring notes 1 Terminals 7 5 3 and 1 are linked inside the controller 2 Terminal 8 provides loop power of 18 30 Vdc 3 Input resistance ...

Page 13: ...to select the correct sensitivity on the PA20 preamplifier see Installation and Maintenance Instructions for details Note Terminals 1 3 5 and 7 are common 20 19 18 17 16 9 8 7 Input Level input Capacitance probe Fig 12 Control relay Select voltage internally N N L L Pump contactor Fuse 3 A max 3 A max A r c h i v e ...

Page 14: ...r see Installation and Maintenance Instructions for details 4 mA always represents valve closed and 20 mA represents valve open regardless of whether pump in or pump out is selected Note Terminals 1 3 5 and 7 are common 20 19 9 8 7 4 3 Select voltage internally Capacitance probe N L 4 20 mA transmitter output to positioner card Max loop resistance 500 W Input Level input Fig 13 3 A max A r c h i v...

Page 15: ...ect the correct sensitivity on the PA20 preamplifier see Installation and Maintenance Instructions for details Note Terminals 1 3 5 and 7 are common Select voltage internally Capacitance probe L N 1 2 4 EL5600 actuator Fill empty control Terminal block X 5 1 000 ohm auxiliary feedback potentiometer Fill empty control 15 14 16 Terminal block X 4 Fig 14 Fuse 3 A max Input Level input A r c h i v e ...

Page 16: ... earthed by level probe Resistance between terminals 5 and 6 is 100 W 6 9 Water meter input for 3 element control systems Can be used with valve motor drive or 4 20 mA positioning Externally powered 4 20 mA water flowmeter CAUTION Controller terminal 1 water meter ve may be earthed by level probe Resistance between terminals 5 and 6 is 100 W Fig 15 5 6 Fig 16 1 2 A r c h i v e ...

Page 17: ...rams The fuse rating must not exceed 3 A Controller and all relay mains supplies must be on the same phase High Normal Alarm 10 11 12 Burner circuit broken at alarm To alarm lamp or bell 3 A maximum Relay supply Low Normal Alarm 13 14 15 Burner circuit broken at alarm To alarm lamp or bell 3 A maximum Relay supply Fig 17 Fig 18 A r c h i v e ...

Page 18: ...ful not to inadvertently make any changes until you understand the system layout 7 3 Using the buttons to select options The display shows the name of the menu on the top line and the available options on the lower line A flashing item on the display means that the user has a choice and may change the menu item or the setting by pressing one of the buttons An arrow on the display shows the user wh...

Page 19: ...f while in MANUAL an input code will be requested when the unit is switched on again If the controller is switched off while in AUTO the normal operational display will appear when the unit is switched on again and actual control will resume see below Note 2 xxxxxxxxx is shown on the diagram below This will in reality show the word VALVE if valve control is selected FLOW if a water meter is select...

Page 20: ...02 93 AB Issue 7 20 The operating modes are accessed as shown in the diagram Use RUN MODE DISPLAY for familiarisation Display settings Steam parameters only displayed when steam meter selected A r c h i v e ...

Page 21: ... Control type Proportional Pump action In boiler water level control for example Input level 0 6 V Lvlinput O rngdet level input out of range detect No Set point 50 Control band 50 Alarm low 00 High alarm 99 Alarm delay 00 s Lockout on alarm No Valve drive Relay Water meter No Steam meter No A r c h i v e ...

Page 22: ...it is switched on again and actual control will resume Note 2 xxxxxxxxx is shown on the diagram opposite This will in reality show the word VALVE if valve control is selected FLOW if a water meter is selected or by PUMP ON PUMP OFF if on off control is selected Access the change mode as shown in the diagram opposite High alarm 90 Control band 15 symmetrical about set point Low alarm 10 100 Absolut...

Page 23: ...ess the right button to enter change mode and display the first variable CONTROL TYPE From page 20 Display settings To page 20 Display settings From page 24 Changing settings To page 24 Changing settings Change mode A r c h i v e ...

Page 24: ...always show you the last information that was entered i e If On Off has been entered then this will be displayed instead of Prop when you go back to that menu item 8 2 Control type To select either Proportional control or On Off control enter the input code and select Change as described in Section 8 0 Choose the option s required by following the diagrams below 8 3 Pump action Select In for boile...

Page 25: ...level in the gauge glass not the low alarm level and defines the lowest point of reference for the system It is most unlikely that the level will be correct for a new system Select Change to allow manual control of the valve pump as shown in the diagram Use the bottom blowdown valve to lower the water level in a boiler Press Enter when the water is at the required level A r c h i v e ...

Page 26: ...is most unlikely that the level will be correct for a new system Select Change to allow manual control of the valve pump as shown in the diagram Press Enter when the water is at the required level 8 7 Lvlinput O rngdet LeVeL INPUT Out of RaNGe DETection If selected this feature will flash ALARM HIGH ALARM LOW if the input signal should fall to below 0 2 V 2 mA or exceed 6 volts It will also de ene...

Page 27: ...INT When the water level is at the top of the control band the feedwater valve is fully closed and when the water level is at the bottom of the band the valve is fully open Note Because the controller has some integral action in Proportional control the actual position of the valve may not always correspond with the level in the gauge glass The LC2610 measures the height of any waves in the boiler...

Page 28: ...e Figure 19 on page 22 8 11 Alarm high A high alarm warns that the boiler water level is higher than the manufacturer s specified limit and that consequently carryover could occur The high alarm relay will normally be wired to sound an alarm and sometimes to stop the feedpump It is possible to wire the system so that the burner is also switched off but we recommend that the boiler manufacturer is ...

Page 29: ...alarm signals 8 13 Alarm lockout If No is selected the low alarm relay will only be de energised e g will cause the alarm to sound for the duration of a low water level and will revert to normal operation as soon as normal water level is reached If Yes is selected the low alarm relay will stay de energised until the Input Code screen is accessed and the security code entered See Section 12 2 page ...

Page 30: ...cting valve select pumping out Section 8 3 Pump action Note If the 4 20 mA output is not used to drive the valve the output will represent level with the following limits Minimum level page 25 4 mA 0 Maximum level page 26 20 mA 100 To page 29 From water meter selection on page 32 8 14 Valve drive 4 20 mA retransmission Select either Relay or 4 20 mA to suit the type of drive required To water mete...

Page 31: ...s where the boiler feedwater pressure varies considerably perhaps due to other boilers drawing water three element control is used A water flowmeter is added to compensate for variations in flow due to pressure variations The diagram shows the selections available and how they relate 8 16 Maximum water The water meter needs to be scaled so that it reads 100 at the maximum boiler output For example...

Page 32: ...IM P402 93 AB Issue 7 32 To page 34 From page 30 To page 30 From page 34 A r c h i v e ...

Page 33: ...IM P402 93 AB Issue 7 33 A r c h i v e ...

Page 34: ...IM P402 93 AB Issue 7 34 MAXIMUM STEAM MAXIMUM STEAM MAXIMUM STEAM From page 32 To page 32 A r c h i v e ...

Page 35: ...IM P402 93 AB Issue 7 35 ä To set up mode on page 19 or 23 ä To set up mode on page 19 or 23 A r c h i v e ...

Page 36: ...ntrol is selected EL5600 Check that the potentiometer wiring is correct Voltage across terminals 1 and 2 of the controller should vary from 0 V valve closed to 2 1 Vdc valve open This voltage can also be measured across terminals 14 and 15 of the potentiometer 10 5 To check that the alarms are functioning Deliberately set them above below the actual water level 10 6 To check that the feedwater val...

Page 37: ... settings Your Changes as supplied settings CODE security code 00 CONTROL TYPE Proportional Proportional On off PUMP ACTION In e g boiler level control In Out e g condensate tank INPUT LEVEL 0 6 V Level probe 0 6 V 4 20 mA Transmitter LVLINPUT O RNGDET level input out of range detect No SET POINT 50 CONTROL BAND 50 ALARM LOW 00 ALARM HIGH 99 ALARM DELAY 00 s ALARM LOCKOUT No VALVE DRIVE Relay Rela...

Page 38: ... Steam flow Low alarm High alarm Steam offset No Enter Yes INCREMENTS DIGIT Change code M M or A M or A A A New code Auto Display Run Mode M INPUT CODE A 50 LEVEL 50 VALVE No Yes CORRECT A A 12 Simplified menu flow chart 12 1 Main menu flow chart A r c h i v e ...

Page 39: ...ve Manual Change Set up Mode Control type Pump action Level input Min level Auto Display Run Mode Max level Out of range Set point Control band Alarm delay Alarm lockout Valve drive Low alarm High alarm Water meter Steam meter A r c h i v e ...

Page 40: ...ue 7 40 A 50 LEVEL 50 VALVE Auto Display Run Mode Auto Display Run Mode M INPUT CODE A Manual Change Set up Mode No No Yes CORRECT Change code 12 2 Clear alarm lock out flow chart See Section 8 13 page 29 A r c h i v e ...

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