DOTECH EVC10B Series, User Manual, Page: 5 / 8

-5-
EVC10B R20140821
: Setting 1 group table (Menu 1 =
1.PR
)
※1 Start open ration and start open ratio duration time
If Run switch is turned on, valve will be opened by start open ratio. After that maintain it during
start open ratio duration time and start to control. (Input optimum value as a start open ratio)
※2 Setup of proportional gain
In the majority of cases, use the result of auto tuning. Extra changes are unnecessary.
Proportional gain makes a decision on control input of valve open ratio
according to superheat change. If proportional gain is 3.0%, control input of
valve open ratio is 3.0% per 1.0K of superheat.
If change of valve open ratio is fickle, decrease proportional gain.
If change of valve open ratio is slow, increase proportional gain more.
Open ratio of valve [%] = Start open ratio + (Proportional gain X Tolerance)
※3 Setup of integral time and derivative time
In the majority of cases, use the result of auto tuning. Extra changes are unnecessary.
Integral time: Input time which is applied to control for accumulated volume of tolerance.
Derivative time: It is for controlling momentary reacting volume for tolerance
If vibration time is longer than integral time,
1. Integral time increases 1.5 times of vibration time.
2. Wait until system is stable.
3. If vibration is lasting, decrease integral time 30%.
4. Wait until system is stable
5. Repeat 3 and 4 until vibration is removed.
If vibration time is shorter than integral time
1. Decrease proportional gain 30%.
2. Wait until system is stable
3. Repeat 1 and 2 until vibration is removed
※4 Detect low superheat alarm
This alarm is caused by superheat is low. Once superheat begins to low, expansion valve start
to close more. If low superheat alarm is occurred, expansion valve is fully closed.
※5 Maximum operating pressure alarm mode
Once maximum operating pressure alarm is occurred, expansion valve is fully closed.
※6 Detect high superheat alarm
This alarm is caused by superheat is high. Once superheat begins to high, expansion valve
start to open more. If high superheat alarm is occurred, expansion valve is fully closed.
※7 Detect freezing protection alarm
If freezing protection alarm is occurred caused by temperature of evaporator is getting low,
expansion valve is fully closed
※8 Pumpdown function
If input pumpdown delay time of 0 to 180 sec, auxiliary relay (RL1) outputs it
as compressor control purpose.
Run switch turns on, RL1 start to run
Run switch turns off, RL1 will be turned off. (Less than pumpdown finish pressure)
※9 Detect low limit pressure alarm
If pressure is dropping up to less than
LOP
for more than
LPD
, low limit pressure alarm will
be occurred and expansion valve is fully closed.
Address Description Code Unit Step Min. Max. Default Custom
4 0001 Superheat set-point SH K 0.1 0.5 30 6.0
4 0003 Start open ratio BIR % 1 0 100 0
4 0004 Start open ration duration time
SDT
Sec. 1 0 300 0
4 0005 P: Proportional gain DFR % 0.1 0.1 99.9 3.0
4 0006 I:Integral time I RT Sec. 1 0 999 120
4 0007 D:Derivative time DRT Sec. 1 0 999 30
4 0008 Low superheat alarm mode
LS
0=No use 1=automatic return 2= manual return 1
4 0009 Detect low superheat alarm
LSH
K 0.1 0.5 30.0 0.5
4 0010 Low superheat alarm delay time LSD Sec. 1 1 300 15
4 0011 Clear low superheat alarm LSF K 0.1 1.0 30.5 3.0
4 0012 Maximum operating pressure alarm mode (MOP)
MP
0=No use 1=automatic return 2= manual return 1
4 0013 MOP
alarm detection pressure MOP
bar 0.1 -1 50 9.0
4 0014 MOP
alarm detection delay time
MPD Min. 1 1 15 1
4 0015 Clear MOP alarm MPF bar 0.1 -1 50 8.0
4 0016 High superheat alarm mode HS 0=No use 1=automatic return 2= manual return 0
4 0017 Detect high superheat alarm
HSH
K 1 10 40 30
4 0018 High superheat alarm delay time HSD Sec. 1 1 600 3
4 0019 Clear high superheat alarm HSF K 0.1 7 37 27
4 0021 Freeze prevention alarm mode FR 0=No use 1=automatic return 2= manual return 0
4 0022 Detect freeze prevention alarm
FRE
℃ 1 -40 40 0
4 0023 Freezing protection alarm delay time
FRD
Sec. 1 5 200 30
4 0024 Clear freeze prevention alarm FRF ℃ 1 -37 43 3
4 0025 Select pumpdown function and delay time PD Sec. 1 0 180
OFF
(-1)
4 0026 Pressure set-point for stopping pumpdown PDP bar 0.1 -0.5 18.0 0.5
4 0027 Pressure low limit alarm mode
LP
0=No use 1=automatic return 2= manual return 0
4 0028 Detect low limit pressure alarm LOP bar 0.1 -0.8 17.7 0.0
4 0029 Low limit pressure alarm delay time LPD Sec. 1 5 200 5
4 0030 Clear low limit pressure alarm LPF bar 0.1 -0.5 18.0 0.3