1. Training Presentation
MCS-MAGNUM EXV LOGIC
Training Presentation
Rev. I - 11/15/2018

2. 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

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

4. EXV CONTROLLER & VALVE
- DESCRIPTION
- WIRING DIAGRAM
- SPECIFICATIONS

5. 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

6. MCS EXV New Feature Firmware Version 6.7 VERSION 6.7 - 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.

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

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

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

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

11. Specifications Display # of Steps ALCO Display # of Steps DANFOSS
750
EX4 & EX5 A2
1660
EX7 A3
2600
EX8
Display
# of Steps
DANFOSS D1
2625
ETS-12/25/50 D2
3530
ETS-100 D3
3810
ETS-250/400
Display
# of Steps
SPORLAN S1
1596
SEI 0.5 to 11 S2
SER 1.5 to 20 S3
3193
SEI 30; SDR –3, SDR-3x S4
2500
Sporlan SERI-G, -J, -K, -L
Sporan SER-B, -C, -D, -F
CDS -2, -4, -7 S5
6386
SEI-50, SEH (I)-100, -175, -400;
CDS –9, -16, -17; SDR –4
Display
# of Steps
CAREL CL
500
E2V, E3V, E4V, E5V, E6V, E7V

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

13. MCS-EXV-DRIVER SET POINTS
(MCS CHILLER) #
NAME
VALUE
TIME
MAX TIME ALLOWED 9
SUPERHT TRGT
10.5 4 8
SH Target ± Ctl Zone 10
SPRHT + -
1.5 - 11
EXV LOAD ADJ
0.6 - 12
EXV FINE ADJ
0.2 -
SH Fine & Course Adj 13
EXV COURSE ADJ
0.5 2 4 15
EXV MIN%
20.5 -
EXV Min & MAX % 16
EXV MAX%
100 - 17
LO SUPERHEAT 1 - 18
LOSUCTPSIDLY 4 -
Timing Ctl
Set Points 19
EXV DELAY 60 - 20
EXV STRT TME 5 -

14. MCS-EXV-DRIVER SET POINTS
(MCS CHILLER) #
NAME
VALUE
TIME
MAX TIME ALLOWED 65
EXV ZONE X1
1.5 -
Individual
Zone Ctl 66
EXV ZONE X2
1.5 - 67
EXV rocZONE1
0.2 4 10
Individual
ROC Ctl 69
EXV rocZONE2
0.3 5 10 70
EXV rocZONE3
0.4 5 10 71
EXV roc FAST 1 10 15
Zone 1 Speed Ctl 72
EXV roc CHG
0.8 10 15

15. EXV ABOVE & BELOW ZONES OPENING 4X COURSE ADJ * 2 @ QUARTER STEP DELAY18 16 15 14 13 12 11 10 9 8 7 6 5 4
ABOVE ZONES
> 15.0
OPENING 4X
COURSE ADJ * QUARTER STEP DELAY
ZONE 2 ABOVE
SPT 66 = 1.5
13.5 TO 15.0
OPENING 2X
COURSE HALF STEP DELAY S U P E R H A T
ZONE 1 ABOVE
SPT 65 = 1.5
12.0 TO 13.5
EXV IS OPENING
FINE STEP DELAY TIME
CONTROL ZONE
SPT 9 = 10.5
SP 10 = 1.5
9.0 TO 12.0
EXV IS HOLDING ROC CONTROL
ZONE 1 BELOW
SP 65 = 1.5
7.5 TO 9.0
EXV IS CLOSING
FINE STEP DELAY TIME
ZONE 2 BELOW
SPT 66 = 1.5
6.0 TO 7.5
CLOSING 2X
COURSE HALF STEP DELAY
BELOW ZONES
< 6.0
CLOSING 4X
COURSE ADJ * QUARTER STEP DELAY

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

17. MCS-EXV-DRIVER SET POINTS#
NAME
VALUE
TIME
MAX TIME ALLOWED 9
SUPERHT TRGT
10.5 4 8
No Change 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

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

19. 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

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

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

22. MCS EXV ROC FUNCTION
(MCS CHILLER) #
NAME
VALUE
TIME
MAX TIME ALLOWED 9
SUPERHT TRGT
10.5 4 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.

23. MCS EXV ROC FUNCTION
(MCS CHILLER) #
NAME
VALUE
TIME
MAX TIME ALLOWED 67
EXV rocZONE1
0.2 4 10 69
EXV rocZONE2
0.3 5 10 70
EXV rocZONE3
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.

24. MCS EXV ROC FUNCTION Super Heat Above Control Zone-
(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.

25. MCS EXV ROC FUNCTION EXV ROC FAST- EXV ROC CHG-
(Special Action)
EXV ROC FAST-
If we are opening or closing at 2x, 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.

26. 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.

27. 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.

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

29. MCS EXV LOW SUCTION ADJUSTMENT
(MCS CHILLER) #
NAME
VALUE
TIME
MAX TIME ALLOWED 13
EXV COURSE ADJ
0.5 4 5 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.

30. MCS-EXV FLOODED LEVEL CONTROL#
NAME
VALUE
TIME
MAX TIME ALLOWED 9
REFR LVL TRG
41.5 2 10
REFR ZONE + - 1 12
EXV FINE ADJ
0.2 - 13
EXV COURSE ADJ
0.5 -
No Change 15
EXV MIN% 10 - 16
EXV MAX%
100 - 18
LOSUCTPSIDLY 4 - 19
EXV DELAY 60 - 20
EXV STRT TME 5 10
EXV set points 9 & 10 now reflect refrigerant level
EXV other set points remain same

31. MCS-EXV FLOODED LEVEL CONTROL
New Set Points #
NAME
VALUE
TIME
MAX TIME ALLOWED 9
REFR LVL TRG
41.5 2
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.

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

33. 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.

34. MCS EXV Controller States
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.

35. EXV State Controller States (Continued)
DESCRIPTION
OPENING 4x
Refer to EXV Logic Chart, superheat is above control zone.
OPENING 2x
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 2x
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 4x
Refer to EXV Logic Chart, superheat is in control zone but
falling too fast, ROC less than -1.0.

36. EXV State Controller States (Continued)
DESCRIPTION
HI LVL CLS
This state indicates that a high refrigerant level.
This state is entered if Set point #109 “HiRefLevel” 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.

37. EXV LOGIC CHART

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

39. FINE TUNING YOUR MCS-EXV-DRIVER
Part 2
Normal MCS CONTROLLER start up.
At 2 to 3 minutes from compressor starting, suction superheat should be between ± Control Zone 1.
If above Control Zone 1 increase starting valve opening %.
If below Control Zone 1 decrease starting valve opening %.
At end of startup Discharge temperature should be 110°F or higher.
If less than 105°F and we have a modulating compressor and the load is adequate increase the startup speed.
Otherwise increase the startup time.
Watch changing capacity, if superheat is moving too much as capacity changes, lower LOAD ADJUST set point.
Pull Graph at about 15 minutes after starting, this will allow you to review startup results.
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.

40. For additional information please visit our website www. mcscontrols
For additional information please visit our website
Or call MCS at