MCSMAGNUM EXV LOGIC Training Presentation www mcscontrols com

MCS-MAGNUM EXV LOGIC Training Presentation www. mcscontrols. com Rev. I - 11/27/2020

MCS EXV CONTROL PRESENTATION 1. EXV CONTROLLER & VALVE a. Controller Description b. Wiring c. Specifications 2. BASIC CONTROLS (INFINITE CAPACITY) a. Set Points b. Control Zones 3. BASIC CONTROLS (STEP CAPACITY) a. Set Points b. Relay Outputs for steps 4. EXV ADAPTIVE CONTROL a. Rate of Change b. Load Adjust c. Low Suction Control

MCS EXV CONTROL PRESENTATION Continued 5. LIQUID LEVEL CONTROL 6. EXV MODES, STATES & LOGIC CHART 7. FINE TUNING YOUR MCS-EXV-DRIVER

EXV CONTROLLER & VALVE - DESCRIPTION - WIRING DIAGRAM - SPECIFICATIONS

MCS-EXV-DRIVER • Standard 110 to 240 VAC ± 10% (50/60 Hz) • Option 24 VAC ± 10% (50/60 Hz) • 2 position led display • Auto / Manual operation • Closes valve on power failure • Eliminates need for Liquid Line Solenoid • 33% faster valve operation • CSA / UL approved

MCS EXV New Feature Firmware Version 7. 0 VERSION 7. 0 - HARDWARE 3. 0 § New Feature was added for MCS-EXV-DRIVER with firmware 6. 7 or greater. § OO= Steps to Overdrive when Opening § OC= Steps to Overdrive when closing § Both are separate variables and can be set with a value between 2 to 8% § Old version of firmware was set to overdrive the valve fixed at 10% of total steps. § By using the new feature settings, the valve will not have to be overdriven as much. These new overdrive parameters are just when the MCS-EXV-DRIVER is running and voltage asked for full open or full closed. When the MCS-EXV-DRIVER is powered up, the valve must still be overdriven the total steps + this overdrive amount. Have to assume worst case at power up, the valve is fully open.

MCS-EXV-DRIVER WIRING Sporlan WHITE WIRE TO ANALOG OUTPUT R E D G R E E N W H I T E B L A C K BLACK & SHIELD TO ANALOG OUTPUT GROUND ELECTRIC EXPANSION VALVE BLACK TO LINE 120/240 VAC WHITE TO NETURAL 120/240

MCS-EXV-DRIVER WIRING Alco WHITE WIRE TO ANALOG OUTPUT B L A C K W H I T E B L U E B R O W N W H I T E B L A C K BLACK & SHIELD TO ANALOG OUTPUT GROUND ELECTRIC EXPANSION VALVE BLACK TO LINE 120/240 VAC WHITE TO NETURAL 120/240

MCS-EXV-DRIVER WIRING Danfoss WHITE WIRE TO ANALOG OUTPUT R E D G R E E N W H I T E B L A C K BLACK & SHIELD TO ANALOG OUTPUT GROUND ELECTRIC EXPANSION VALVE BLACK TO LINE 120/240 VAC WHITE TO NETURAL 120/240

MCS-EXV-DRIVER WIRING Carel WHITE WIRE TO ANALOG OUTPUT G R E E N B R O W N W H I T E Y E L L O W W H I T E B L A C K BLACK & SHIELD TO ANALOG OUTPUT GROUND ELECTRIC EXPANSION VALVE BLACK TO LINE 120/240 VAC WHITE TO NETURAL 120/240

Specifications Display # of Steps ALCO A 1 750 EX 4 & EX 5 A 2 1660 EX 7 A 3 2600 EX 8 A 4 2040 ALCO-TRANE 200 TON Display D 1 2625 ETS-12/25/50 D 2 3530 ETS-100 D 3 3810 ETS-250/400 Display CL # of Steps DANFOSS # of Steps SPORLAN S 1 1596 SEI 0. 5 to 11 S 2 1596 SER 1. 5 to 20 S 3 3193 SEI 30; SDR – 3, SDR-3 x S 4 2500 Sporlan SERI-G, -J, -K, -L Sporan SER-B, -C, -D, -F CDS -2, -4, -7 S 5 6386 SEI-50, SEH (I)-100, -175, -400; CDS – 9, -16, -17; SDR – 4 # of Steps CAREL 500 E 2 V, E 3 V, E 4 V, E 5 V, E 6 V, E 7 V

MCS EXV BASIC CONTROL (Infinite Capacity Control) - SET POINTS - CONTROL ZONES

MCS-EXV-DRIVER SET POINTS (MCS CHILLER) # NAME VALUE TIME MAX TIME ALLOWED 9 SUPERHT TRGT 10. 5 4 8 10 SPRHT + - 1. 5 - - 11 EXV LOAD ADJ 0. 6 - - 12 EXV FINE ADJ 0. 2 - - 13 EXV COURSE ADJ 0. 5 2 4 15 EXV MIN% 20. 5 - - 16 EXV MAX% 100 - - 17 LO SUPERHEAT 1 - - 18 LOSUCTPSIDLY 4 - - 19 EXV DELAY 60 - - 20 EXV STRT TME 5 - - SH Target ± Ctl Zone SH Fine & Course Adj EXV Min & MAX % Timing Ctl Set Points

MCS-EXV-DRIVER SET POINTS (MCS CHILLER) # NAME VALUE TIME 65 MAX TIME ALLOWED EXV ZONE X 1 1. 5 - - 66 EXV ZONE X 2 1. 5 - - 67 EXV roc. ZONE 1 0. 2 4 10 69 EXV roc. ZONE 2 0. 3 5 10 70 EXV roc. ZONE 3 0. 4 5 10 71 EXV roc FAST 1 10 15 72 EXV roc CHG 0. 8 10 15 Individual Zone Ctl Individual ROC Ctl Zone 1 Speed Ctl

EXV ABOVE & BELOW ZONES 18 16 15 S U P E R H E A T 14 13 12 11 10 9 8 7 6 5 4 ABOVE ZONES ZONE 2 ABOVE SPT 66 = 1. 5 ZONE 1 ABOVE SPT 65 = 1. 5 > 15. 0 13. 5 TO 15. 0 12. 0 TO 13. 5 CONTROL ZONE SPT 9 = 10. 5 SP 10 = 1. 5 9. 0 TO 12. 0 ZONE 1 BELOW SP 65 = 1. 5 7. 5 TO 9. 0 ZONE 2 BELOW SPT 66 = 1. 5 6. 0 TO 7. 5 BELOW ZONES < 6. 0 OPENING 4 X COURSE ADJ * 2 @ QUARTER STEP DELAY OPENING 2 X COURSE ADJ @ HALF STEP DELAY EXV IS OPENING FINE ADJ @ STEP DELAY TIME EXV IS HOLDING ROC CONTROL EXV IS CLOSING FINE ADJ @ STEP DELAY TIME CLOSING 2 X COURSE ADJ @ HALF STEP DELAY CLOSING 4 X COURSE ADJ * 2 @ QUARTER STEP DELAY

MCS EXV BASIC CONTROL (Step Capacity Control) - SET POINTS - RELAY OUTPUT SETUP FOR STEPS

MCS-EXV-DRIVER SET POINTS # NAME VALUE TIME MAX TIME ALLOWED 9 SUPERHT TRGT 10. 5 4 8 10 SPRHT + - 1. 5 - - 12 EXV FINE ADJ 0. 2 - - 13 EXV COURSE ADJ 0. 5 - - 14 EXV LOAD DIV 3 - - With EXV Step Control the following Set Points are changed: • SP 11, ‘EXV LOAD ADJUST’ is deleted • SP 14, ‘EXV LOAD DIV’ is added • As the Amp draw % changes this divides the EXV % change calculated as the ratio of slide movement to valve movement [(Max slide% – min slide%) / (Max vlv% - min vlv%)] +1 No Change

MCS-EXV-DRIVER SET POINTS # NAME VALUE TIME MAX TIME ALLOWED 15 EXV MIN% 10 - - 16 EXV MAX% 100 - - 17 LO SUPERHEAT 2 120 18 LOSUCTPSIDLY 4 - - 19 EXV DELAY 60 - - 20 EXV STRT TME 5 10 10 The remaining set points remain active with the following changes: • SP 17 TIME & MAX TIME ALLOWED are setup No Change

MCS RELAY OUTPUT CFG SETUP (Step Capacity Control) - Cfg RO screen when Type = Step w EXV setup following: • EXV Starting % when this compressor is the lead • EXV Load Adjust %, the % increase to apply to the current EXV opening when this compressor is not the lead and is started • EXV Unld adjust %, the % decrease to apply to the current EXV opening when this compressor is not the last compressor and is turned off

MCS RELAY OUTPUT MCS-CONNECT EXV START WHEN LEAD COMPRESSOR STARTING % COMPRESSOR TIME IN STARTUP

EXV ADAPTIVE CONTROL - RATE of CHANGE - LOAD ADJUSTMENT - LOW SUCTION CONTROL

MCS EXV ROC FUNCTION (MCS CHILLER) # 9 NAME SUPERHT TRGT VALUE TIME 10. 5 4 MAX TIME ALLOWED 8 - TIME field in set point 9 is the number of seconds to look at the slope of the superheat (ROC). - MAX TIME ALLOWED field is the maximum value the TIME field can be set to.

MCS EXV ROC FUNCTION (MCS CHILLER) # NAME VALUE TIME MAX TIME ALLOWED 67 EXV roc. ZONE 1 0. 2 4 10 69 EXV roc. ZONE 2 0. 3 5 10 70 EXV roc. ZONE 3 0. 4 5 10 - VALUE field in set points is the ROC allowed for that zone - TIME field is the minimum time the EXV is kept in the HOLDING state.

MCS EXV ROC FUNCTION (Special Action) Super Heat Above Control Zone§ § § If above zones and the EXV ROC is negative and < then SP 70 then hold for number of seconds in time field. If in Zone 2 and the EXV ROC is negative and < then SP 69 then hold for number of seconds in time field. If in Zone 1 and the EXV ROC is negative and < then SP 67 then hold for number of seconds in time field. Super Heat Below Control Zone§ § § If in Zone 1 and the EXV ROC is positive and > then SP 67 then hold for number of seconds in time field. If in Zone 2 and the EXV ROC is positive and > then SP 69 then hold for number of seconds in time field. If in Zone 3 and the EXV ROC is positive and > then SP 70 then hold for number of seconds in time field.

MCS EXV ROC FUNCTION (Special Action) § EXV ROC FAST- § If we are opening or closing at 2 x, if the absolute value of the super heat ROC is > than the value in SP 71 we will hold for the time in SP 71. § EXV ROC CHG§ If the super heat state is ‘EXV is HOLDING’ this value specifies the maximum value of the change % that can be made.

MCS EXV LOAD ADJ FUNCTION (MCS CHILLER) # NAME VALUE TIME MAX TIME ALLOWED 9 SUPERHT TRGT 10. 5 4 8 11 EXV LOAD ADJ 0. 6 - - - VALUE field, in EXV LOAD ADJ, is the value the EXV will be adjusted each time the compressor capacity is adjusted. Used on modulating compressors.

MCS EXV LOW SUCTION ADJUSTMENT HOW IT NORMALLY OCCURS § Condenser is sized for high ambient § We have a low ambient condition § Usually when the last stage of condensing is turned on WHAT NORMALLY HAPPENS § Because of the pressure drop some of the liquid boils off before it gets to the EXV § Now you have liquid and vapor mixed requiring the EXV to open § This occurs within 1 minute and system returns to normal in about 3 minutes.

GRAPH OF LOW SUCTION OCCURING Notice the 3 rd stage of condensing comes on 15 seconds later the suction psi crashes

MCS EXV LOW SUCTION ADJUSTMENT (MCS CHILLER) # NAME VALUE TIME MAX TIME ALLOWED 0. 5 4 5 13 EXV COURSE ADJ 18 LOSUCTPSIDLY 2 - - 19 EXV DELAY 60 - - § Once the Magnum has determined it is in a LOW SUCTION situation it will take the EXV COURSE ADJ and multiply it by the value in the TIME field of SP 13. It will continue to make this adjustment, based on the value in Set Point 56 ‘PULSE or CMP LOAD DELAY’ until the situation is cleared.

MCS-EXV FLOODED LEVEL CONTROL # NAME VALUE TIME MAX TIME ALLOWED 9 REFR LVL TRG 41. 5 2 0 10 REFR ZONE + - 1 0 0 12 EXV FINE ADJ 0. 2 - - 13 EXV COURSE ADJ 0. 5 - - 15 EXV MIN% 10 - - 16 EXV MAX% 100 - - 18 LOSUCTPSIDLY 4 - - 19 EXV DELAY 60 - - 20 EXV STRT TME 5 10 10 - EXV set points 9 & 10 now reflect refrigerant level - EXV other set points remain same No Change

MCS-EXV FLOODED LEVEL CONTROL New Set Points # NAME VALUE TIME MAX TIME ALLOWED 9 REFR LVL TRG 41. 5 2 0 109 HI REFR LEVEL 50. 0 - - 217 LOW REFR LEVEL 32. 5 - - - Set point 9 & 217 specify the range that will be used to maintain and even refrigeration level when required. - Set point 109 specifies the upper limit and will cause a safety shutdown.

EXV UNIT MODES & STATES - EXV DRIVER MODES - EXV STATES - EXV LOGIC CHART

MCS EXV Unit Modes § Auto Mode – The unit defaults to this mode after every power up. In this mode, the MCS-EVX-DRIVER-XX positions the valve according to the analog input control voltage. § Manual Mode – When in auto mode, holding the ‘Auto/Manual’ key for 5 seconds, then entering the authorization number switches the unit into Manual mode. In this mode, the valve position is controlled with the keypad’s directional arrows. § Power Down Mode – If the main power is disconnected, the controller switches to the power down mode. In this mode, the controller uses internal power to close the expansion valve.

MCS EXV Controller States STATE DESCRIPTION LOCKED OUT The compressor is in a Lockout state. EXV IS CLOSED The associated compressor is OFF and the valve is closed. PRE-PMPDWN The valve has been in a closed state while the system goes through a pump down. EXV IN STARTUP At startup the valve will remain in this state for the time in Set Point #20. At that time the state will be changed to holding, at this point the valve control logic will position the valve. EXV AT 100% This state will be entered when the valve opening reaches 100%. EXV IS HOLDING Refer to EXV Logic Chart, superheat is in control zone and ROC is acceptable. EXV IS OPENING Refer to EXV Logic Chart, superheat is in control zone but rising too fast, ROC less than 1. 0. EXV IS CLOSING Refer to EXV Logic Chart, superheat is in the control zone and the rate of change is acceptable, ROC greater than -0. 5. LOW SPRHT Refer to EXV Logic Chart, force a course valve adjustment.

EXV State Controller States (Continued) STATE DESCRIPTION OPENING 4 x Refer to EXV Logic Chart, superheat is above control zone. OPENING 2 x Refer to EXV Logic Chart, superheat is in control zone but rising too fast, the ROC is greater than 1. 0. LO PSI OPN Refer to EXV Logic Chart, state indicates that a low suction pressure condition exists. The suction pressure is less than Set point #77 “LOW SUCTION” plus twice the value of Set point #79 “LOW SUCT RELOAD” and the superheat is greater than Set point #9 “SUPERHT TRGT” plus twice the value of Set point #10 “SPRHT ZONE+-. ” CLOSING 2 x Refer to EXV Logic Chart, superheat is in the control zone and the rate of change is acceptable, the ROC is less than -0. 5 and greater than -1. 0. CLOSING 4 x Refer to EXV Logic Chart, superheat is in control zone but falling too fast, ROC less than -1. 0.

EXV State Controller States (Continued) STATE DESCRIPTION HI LVL CLS This state indicates that a high refrigerant level. This state is entered if Set point #109 “Hi. Ref. Level” is active and the superheat is greater than the value of this Set point. EXV MOP CLS Refer to EXV Logic Chart. Maximum operating pressure option is active and it is forcing the EXV to close. In this state the EXV valve’s opening will be reduced. EXV MOP HLD Refer to EXV Logic Chart. Maximum operating pressure option is active and it is forcing the EXV to hold.

EXV LOGIC CHART

FINE TUNING YOUR MCS-EXV-DRIVER Part 1 Verify what has been done. 1. Completed the MCS EXV DRIVER setup specifying valve type. 2. Completed the setup for starting valve position in cfg. 3. If a modulating compressor verify starting % is set. Using MCS-Connect, review start up. 1. Set history sample rate at 1 sec 2. Place RUN/STOP switch to RUN

FINE TUNING YOUR MCS-EXV-DRIVER Part 2 Normal MCS CONTROLLER start up. 1. At 2 to 3 minutes from compressor starting, suction superheat should be between ± Control Zone 1. a. If above Control Zone 1 increase starting valve opening %. b. If below Control Zone 1 decrease starting valve opening %. 2. At end of startup Discharge temperature should be 110°F or higher. a. If less than 105°F and we have a modulating compressor and the load is adequate increase the startup speed. b. Otherwise increase the startup time. 3. Watch changing capacity, if superheat is moving too much as capacity changes, lower LOAD ADJUST set point. 4. Pull Graph at about 15 minutes after starting, this will allow you to review startup results. 5. If Unit is stable but EXV is hunting check time in superheat target. The length of time to calculate superheat ROC should be no less then 3 and no higher than 8. If hunting lower by 1 and watch results.

For additional information please visit our website www. mcscontrols. com Or call MCS at 239 -694 -0089