DOTECH DPX300 User manual

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Digital Pressure Switch
CAUTIONS
1. This product may cause an electric shock in handling. Please do not attempt to open it with power turned on.
2. This product should be installed in a place fixed secured by a rack or panel.
3.This product can be used under the following environmental condition.
① Indoor ②Pollution Degree 2 ③At an altitude of 2000m or below
4. Power input must be within the designated ranges.
5. To turn on or turn off power supply for this product, please the circuit breaker or switch of a standard product of IEC
60947-1 or IEC 60947-3 product and install it within a close distance allowing convenient operation by user.
6. Please be understood that if this product is dismantled or modified discretionary, after sales service will not
be able to be provided.
7. An output wire to be used for this product should be inflammable grade FV1 (V-1 grade or above), the thickness
of the wire should be AWG No. 20 or above(0.50mm
2
).
8. In order to prevent it from an inductive noise, please maintain the high-voltage wire and power wire separated.
9. Please avoid installing the product in a place where a strong magnetism, noise, severe vibration and impact exist.
10. When extending the sensor wire, use a shield wire and do not extend it unnecessary long.
11. The sensor wire and signal wire should be away from the power and load wires using conduits separately installed.
12. Please avoid using the product near a device generating strong high frequency noise (high-frequency welding machine,
high-frequency sewing machine, high-frequency radiotelegraph, high capacity SCR controller)
13. Product’s damages other than those decribed in the guarantee conditions provided by the manufacturer shall not be
respoinsible by us.
14. If this unit is used to control machineries (Medical equipment, vehicle, train, airplane, combustion apparatus,
entertainment, processing and transportation equipment, elevator and various safety device etc.) enabling to effect
on human or property, it is required to install fail-safe device.
※ The Aforementioned precautions must be observed, and if you fail to do so, it may cause a product’s breakdown
.
※ The specifications, dimensions, and etc. are subject to change for enhancement without a prior notice.
DPX300
User Manual
DOTECH INC.
6F, JOONGANG-ILBO B/D, 30, Dongsan-ro, Danwon-gu,
Ansan-si, Gyeonggi-do, KOREA
TEL: [phone] FAX: [phone]
www.dotech21.com
1. OVERVIEW
※ FEATURES
- High pressure protection, Low pressure protection, Oil pressure protection,
an integrated high pressure fan control
- Automatic / Manual reset, Selectionof various refrigerants
- Precise pressure control, Sensor offset, Sensor error detection
: SPECIFICATIONS(STANDARD MODEL)
Description
Power 100 – 240 Vac, 50/60 Hz
Power Consumption MAX 10 VA
Output 4P Relay Outputs / 250Vac, 30Vdc, 5 A
Pressure
Sensors
Measurement
Range -0.10 ~ 5.00 MPa
Accuracy ±1.0 %FS
Overpressure 150 %FS
Stability ±0.5 %FS/year
Shock 20 g sinusoidal, 11 msec
Vibration x-y-z directions of 5 -2000Hz / 10g
Working Temp. -40 ~ 120 °C
Connection 7/16UNF” / MALE
PressureType Gauge
Dimensions 159(W)mm X 128(H)mm X 58(D)mm
Operation Temperature -10~50 °C / Humidity 90%RH or less
Storage Temperature -20~60 °C / Humidity 90%RH or less
: SELECTION GUIDE
Model Description
DPX300-HLO-00-MPA Digital Pressure Switch Standard(PressureUnit: MPa )
DPX300-HLO-R4-MPA Digital Pressure Switch for Communication(RS485 Modbus )
DPX300-HLO-00-KGF Digital Pressure Switch Standard(Pressure Unit: kgf/cm2)
DPX300-HLO-R4-KGF Digital Pressure Switch for Communication(RS485 Modbus )
DPX300-HLO-00-BAR Digital Pressure Switch Standard(Pressure Unit: bar )
DPX300-HLO-R4-BAR Digital Pressure Switch for Communication(RS485 Modbus )
DPX300-HLO-00-PSI Digital Pressure Switch Standard(Pressure Unit: psi )
DPX300-HLO-R4-PSI Digital Pressure Switch for Communication(RS485 Modbus )
※Communication is not supported in standard models.
※Specify the pressure unit when ordering.
: Supplied Contents
Bracket 1ea User Manual
※This item is provided for securing the bracket tightening all bolts please.

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2. INSTALLATION
：DIMENSIONS AND MOUNTING(unit: mm)
※ Please install a siphon tube to protect from pulsating pressure and high temperature contact.
LP : Low Pressure | OP : Oil Pressure | HP : High Pressure
(unit : mm)
: WIRING DIAGRAM
No Connection Description
1 L1
100–240Vac, 50/60Hz Power Input
2 L2
3 LPS
Open when the low pressure is below lower limit
4
Common signal
5 HPS
Open when the high pressure is above the upper limit
6
Common signal
7 OPS
Open when the oil pressure is below lower limit
8
Common signal
9 HPC
Closed when the high pressure is above the upper limit
10
Common signal
11 RS485
TRX + signal
12
TRX – signal
3. USER INTERFACES
: DISPLAY AND CONTROLS
Description
DP
On when displaying differential pressure
LED
HPS
ON/OFF of Output / ON when Overpressure
HPC
ON/OFF of Output / ON when Fan is Running
ALM
On when alarm occurs
OP
On when displaying oil pressure
LPS
ON/OFF of Output / ON when Underpressure
OPS
On/Off of output / On when oil pressure
RST
ON when Manual Reset
Button
Parameter Settings / Manual Reset(if pressed twice quickly)
Increase or Move Up
Decrease or Move Down
Select & Save / Displayof SaturatedTemperature
Display differential pressure value, oil pressure value
S
etup values will be initialized if pushing PRG button
and ▼button for 10 seconds.

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4. PARAMETER
: PARAMETER CHANGE
.
: PARAMETER TABLE
No Menu Code Unit Step Min Max Default CustomSetup
4 0031 High Pressure Switch Set Value HPS MPa 0.01
-0.1 0 5.00 2.60
4 0032 High Pressure Switch Reset Mode (※1)
(Manual / Automatic Reset) HPH A (0)= Automatic Reset H (1)= Manual Reset H(1)
4 0033 High Pressure Switch ReleasingValue HPF MPa 0.01
-0.1 0 HPS- 0.01 2.50
4 0041 Set Value for Switching ON a Fan HPC MPa 0.01
-0.1 0 5.00 1.50
4 0043 Set Value for Switching OFF a Fan HCF MPa 0.01
-0.1 0 HPC- 0.01 1.40
4 0051 Low Pressure Switch Set Value LPS MPa 0.01 -0.10 5.00 0.25
4 0052 Low Pressure Switch Reset Mode (※1)
(Manual / Automatic Reset) LPH A (0)= Automatic Reset H (1)= Manual Reset A(0)
4 0053 Low Pressure Switch ReleasingValue LPF MPa 0.01
LPS+ 0.01 5.00 0.35
4 0055 Low Pressure Switch DelayTime (※2) LPD sec 1 0 999 0
4 0065 Oil Pressure Switch SetValue (※3) 0PS MPa 0.01 -0.00 5.00 0.10
4 0066 Oil Pressure Switch Reset Mode (※1)
(Manual / Automatic Reset) 0PH A (0)= Automatic Reset H (1)= Manual Reset A(0)
4 0067 Oil Pressure Switch ReleasingValue (※3) 0PF MPa 0.01
OPS + 0.01 5.10 0.20
4 0068 Oil Pressure Switch DelayTime (※4) 0PD sec 1 0 999 0
4 0069 Oil PressureSwitch Control Mode (※5) 0DP 0-L (0)=OP - LP H-0(1)= HP - OP 0-L(0)
4 0061 Refrigerant Selection (※6) RFY
R22 (0)= R22
R23 (1)= R23
123 (2)= R-123
124 (3)= R-124
134 (4)= R-134a
404 (5)= R-404a
407 (6)= R-407c
410 (7)= R-410a
507 (8)= R-507
R22 (0)
4 0063 Communication ID ID - 1 1 255 1
4 0064 Communication BPS BDR 48 (0)= 4800 96 (1)= 9600 192 (2)= 19200 384 (3)= 38400 96 (1)
4 0071 Low Pressure Offset (※7) LOF MPa 0.01 -1.99 1.99 0.00
4 0072 High Pressure Offset (※7) HOF MPa 0.01 -1.99 1.99 0.00
4 0073 Oil Pressure Offset (※7) 0OF MPa 0.01 -1.99 1.99 0.00
(※1) Reset mode: Automatic Reset (A): It will be reset automatically when reaching releasingpressure value.
Manual reset (H): It will not be reset when reaching release pressure value unless users press RST button twice consecutively.
(※2) Low pressure switch delay time : If output is activated, it maintenancesON status during minimum ON time even underthe OFF condition.
(※3) Oil Pressure Switch SetValue : Differential pressure = Oil pressure – Low pressur
e
It becomes an ON condition for output if differential pressure valve (DP) is less than oil switch pressure switch set value (OPS). Output is de-activated if
differential pressure value (DP) ishigher than oil pressure switch releasing value (OPF) after output isactivated.
(※4) Oil Pressure Switch DelayTime : Output will be activated after maintaining delay time which is set even though it is under the ON condition.
LED lamp will be turned on a light simultaneously with output after flickering duringdelay time.
(※5) Oil Pressure Switch Control Mode Control mode for oil pressure switch: In case of using control mode for oil pressure switch as 0-L (OP – LP),
it can be come to aoutput state ofOPS due to pressure equalizing at the status of compressor stop.
(※6) Refrigerant selection : Display saturation temperature in accordance with selected refrigerant.
(※7) Offset : Offset the differential for pressure sensor.
e.g) If displayed pressure value: 0.20MPa and actual pressure value: 0.22MPa It is offset by inputting +0.02MPa.

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: TRIP / ALARM MESSAGES
No Menu Code Description / Instructions Response at Detection Reset Type
1 Internal Parameter Error 5 Y 5 Change any parameters and turn off. Then restart. Immediate Stop Automatic Reset
2 High Pressure Sensor Open HO P Please check a high pressure sensor because it is open. Immediate Stop Automatic Reset
3 High Pressure Sensor Short H5 H Please check a high pressure sensor because it is short. Immediate Stop Automatic Reset
4 Low Pressure Sensor Open LO P Please check a lowpressure sensor because it is open. Immediate Stop Automatic Reset
5 Low Pressure Sensor Short L5 H Please check a low pressure sensor because it is short. Immediate Stop Automatic Reset
6 Oil Pressure Sensor Open 0O P Please check a oil pressure sensor because it is open. Immediate Stop Automatic Reset
7 Oil Pressure Sensor Short 05 H Please check a oil pressure sensor because it is short. Immediate Stop Automatic Reset
※When it alarms, it beeps and all the outputs are cut off.To stop the beep, press the reset.
5. COMMUNICATIONS SPECIFICATIONS
: Communication Model ( -R4 )
Description
Transmission line connection Multiple line
Communications method RS485 (2-wire, half-duplex)
BPS BPS default 9600 BPS
Parity, Data, Stop bit None, 8 Data, 1 Stop
ProtocolType Modbus RTU MODE
Function Code Read HOLD REGISTERS (0x03) , Preset Single Register (0x06)
Maximum Read Word 16 Word
Media Type BELDEN 9841 / 9842, LG LIREV-AMESB
Poll interval 100msec
: HOLD REGISTERS
※ Pressure Unit Conversion Table
MPa bar kgf/cmpsi
1MPa 1 1ⅹ10 1.0197162ⅹ10 1.450382ⅹ10
1bar 1ⅹ10 1 1.019716 1.4503824ⅹ10
1kgf/cm9.80665ⅹ10 9.80665ⅹ10 1 1.4223393ⅹ10
1psi 6.895ⅹ10 6.8947ⅹ10 7.0307ⅹ10 1
Address Menu Unit Type Size (Word) DPX200 MMI Scale
4 0011 Output status code - Digital INT 16 Refer to bitstatus below -
Bit0 High PressureSwitch SetValue - Digital Bit 0 : OFF 1 : ON -
Bit1 Set Value for Switching ON a Fan - Digital Bit 0 : OFF 1 : ON -
Bit2 Low Pressure Switch SetValue Digital Bit 0 : OFF 1 : ON -
Bit3 Oil Pressure Switch SetValue Digital Bit 0 : OFF 1 : ON -
4 0013 Alarm status code - Digital INT 16 Refer to bit status below -
Bit0 Internal control variables error
(Internal control factor error) - Digital Bit 0 : Normal 1 : Alarm -
Bit1 High pressure sensor faulty - Digital Bit 0 : Normal 1 : Alarm -
Bit2 Low pressure sensor faulty Digital Bit 0 : Normal 1 : Alarm -
Bit3 Oil pressure sensor faulty Digital Bit 0 : Normal 1 : Alarm -
4 0023 Display of high pressure value MPa Analog INT 16 -0.10 ~ 5.00 -10 ~ 500 1/100
4 0024 Display of low pressure value MPa Analog INT 16 -0.10 ~ 5.00 -10 ~ 500 1/100
4 0025 Display of oil pressure value MPa Analog INT 16 0.00 ~ 5.00 0 ~ 500 1/100
4 0026 Display of saturation temperature for
low pressure °C Analog INT 16 -150.0 ~ 200.0 -1500 ~ 2000 1/10
4 0027 Display of saturation temperature for
high pressure °C Analog INT 16 -150.0 ~ 200.0 -1500 ~ 2000 1/10
4 0030 Display of differentialpressure value
(Oil pressure – Low pressure) °C Analog INT 16 0.0 ~ 5.10 0 ~ 510 1/100