Veichi Electric VC-4PT User manual

1
VC-4PT Resistive Temperature Input Module User Manual
Thank you for purchasing the vc-4pt resistance temperature input module developed and produced by Suzhou VEICHI
Electric Technology Co., Ltd. Before using our VC series PLC products, please read this manual carefully, so as to better grasp
the characteristics of the products and correctly install and use them. More secure application and make full use of the rich functions
of this product.
Tip：
Please read the operating instructions, precautions and cautions carefully before starting to use the product in order to reduce
the risk of accidents. Personnel responsible for the installation and operation of the product must be strictly trained to comply with
the safety codes of the relevant industry, strictly observe the relevant equipment precautions and special safety instructions provided
in this manual, and carry out all operations of the equipment in accordance with the correct operating methods.
1 Interface description
1.1 Interface description
The expansion interface and user terminals of the VC-4PT are covered with flaps, and the expansion interface and user
terminals are exposed when each flap is opened. The appearance and interface terminals are shown in Figure 1-1.
RUN
ERR VC-4PT
VEIC HI
24V R1+ R1-
I1-I1+COM
Sliding snap
DIN slot s nap
Product labels
Extended male plug
Extension female socket
Status Indicator
Wiring terminals
Terminal cover
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
R2+ R2-
I2-I2+
R3+ R3-
I3-I3+
R4+ R4-
I4-I4+
Figure 1-1 Module interface appearance - Module interface terminal diagram
1.2 Product
VC- 4 PT
PT (Thermal resistance type input module)
Number of channels (4-channel input in the example)
VC:VEICHI Programmable controller
Figure 1-2 Model number
The VC-4PT is connected to the system via the expansion interface, which is used for the connection of other expansion
modules of the system, as described in 1.4 Accessing the system

2
1.3 Definition of terminal
The user terminals are shown in Figure 1-3
No.
Marking
Instruction
No.
Marking
Instruction
1
24V
Analogue power supply 24V positive
2
COM
Analogue power supply 24V negative
3
R1+
Positive input for channel 1 RTD signal
4
I1+
Channel 1 RTD signal auxiliary positive input
5
R1–
Channel 1 RTD signal negative input
6
I1–
Auxiliary negative input for channel 1 RTD signal
7
R2+
Positive input for channel 2 RTD signal
8
I2+
2nd channel RTD signal auxiliary positive input
9
R2-
Positive input for channel 2 RTD signal
10
I2–
Channel 2 RTD signal auxiliary negative input
11
R3+
Positive input for channel 3 RTD signal
12
I3+
3rd channel RTD signal auxiliary positive input
13
R3–
Channel 3 RTD signal negative input
14
I3–
3rd channel RTD signal auxiliary negative input
15
R4+
Positive input for channel 4 RTD signal
16
I4+
Channel 4 RTD signal auxiliary positive input
17
R4-
Positive input for channel 4 RTD signal
18
I4-
Channel 4 RTD signal auxiliary negative input
Figure 1-3 Terminal definition table
1.4 Access system
The expansion interface allows the VC-4PT to be connected to a main module of the VC series
PLC or to other expansion modules. The expansion interface can also be used to connect other
expansion modules of the same or different models of the VC series. This is shown in Figure 1-4.
Push to theright Push to theleft
VC1-1 61 4M AR
Figure 1-4 Schematic diagram of the connection to the main module and other expansion modules
1.5 Wiring instruction
User terminal wiring requirements, as shown in Figure
Figure 1-5 Diagram of user terminal wiring
The diagrams ①- ⑤indicate the five aspects that must be taken into account when wiring.
V
+
DC
/
DC
Converter
AGND





I
+
4
Thermal resistance
I
+
R
2
+
-
Thermal resistance
CH4
I
1
+
R
1
+
1
-

Thermal resistance
+
+

Thermal resistance
+

Thermal resistance
+
+
-
4-wire connection method
2-wire connection method
3-wire connection method
AGND
AGND
AGND
24VDC%±10%
55mA
VC-4PT
|
CH2
CH1
+5V
-5V
I1+
R1+
R1-
I1-
I1+
R1+
R1-
I1-
I1+
R1+
R1-
I1-
I2+
R2+
R2-
I2-
I1+
R1+
R1-
I1-
I4+
R4+
R4-
I4-
24V+
24V-

3
1. The RTD signal is connected via a shielded cable. The cable should be routed away from power cables or other wires that
may cause electrical interference. The cables to be connected to the RTD are described as follows.
1) RTD sensors (type Pt100, Cu100, Cu50) can be connected using 2, 3 or 4-wire system, with 4-wire system connection
being the most accurate, 3-wire system the second most accurate and 2-wire system the worst. When the wire length is greater than
10m, it is recommended to use 4-wire connection to eliminate the wire resistance error.
2) In order to reduce the measurement error, and to avoid interference by noise, it is recommended to use a length of less
than 100m connection cable. The measurement error is caused by the impedance of the connection cable and may be inconsistent
for different channels in the same module, so it is necessary to adjust the characteristics of each channel, as described in 3
Characteristics setting. 2.
2. If there is excessive electrical interference, connect the shield ground terminal.
3. Connect the external power supply PE to a good earth.
4. The analogue power supply can be supplied from the 24 Vdc output of the main module or from another source that meets
the requirements.
5. Short the positive and negative terminals of the channel not in use to prevent false data being detected on this channel.
2 Instruction for use
2.1 Power indicator
Table 2-1 Power supply indicators
Project
Indicator
Analog circuits
24Vdc (-10 % to +10 %) Maximum allowable ripple voltage 2 %
50mA (from mains module or external power supply)
Digital Circuit
5Vdc, 70mA (from the main module)
2.2 Performance indicators
Table 2-2 Performance indicators
Project
Indicator
Celsius (°C)
Fahrenheit (°F)
Input signal
RTD type: Pt100, Cu100, Cu50
Number of channels: 4
Conversion speed
(15±2%) ms ×4 channels (unused channels are not converted)
Rated temperature range
Pt100
–150℃～+600℃
Pt100
–238°F～+1112°F
Cu100
–30℃～+120℃
Cu100
–22°F～+248°F
Cu50
–30℃～+120℃
Cu50
–22°F～+248°F
Digital output
12-bit A/D conversion; temperature values stored in 16-bit binary complement
Pt100
–1500～+6000
Pt100
–2380～+11120
Cu100
–300～+1200
Cu100
–220～+2480
Cu50
–300～+1200
Cu50
–220～+2480
Minimum resolution
Pt100
0.2℃
Pt100
0.36°F
Cu100
0.2℃
Cu100
0.36°F
Cu50
0.2℃
Cu50
0.36°F
Precision
±0.5% of full scale
Isolation
The analogue circuitry is isolated from the digital circuitry by an opto-coupler. The analogue circuitry is
internally isolated from the module input 24Vdc supply. No isolation between analogue channels
2.3 Indicator light description
Project
Instruction
Signal indicator
RUN status indicator, blinking when normal
ERR error status indicator, illuminated on failure
Expansion module rear stage interface
Connection of rear modules, hot-swappable not supported
Expansion module front interface
Connection of front-end modules, hot-swappable not supported
3 Characteristic setting
(1) The input channel characteristics of the VC-4PT are a linear relationship between the channel analogue input temperature
A and the channel digital output D, which can be set by the user. Each channel can be interpreted as the model shown in Figure 3-
1. As it is linear, the channel characteristics can be determined by determining two points P0 (A0, D0) and P1 (A1, D1). Where

4
D0 indicates that the channel outputs digital when the analogue input is A0 and D1 indicates that the channel outputs digital when
the analogue input is A1
Channel D
Digital Output
A
Analog Input
Channel model
D1
A (0.1℃)
Channel Characteristics
D0
A0 A1
P1
P0
D(0.1℃)
Figure 3-1 Schematic diagram of VC-4PT channel characteristics
(2) The measurement error is caused by the impedance of the connection cable, which can be eliminated by setting the channel
characteristics.
(3) Considering the user's ease of use and without affecting the function, in the current mode, A0 and A1 are corresponding
to [Actual Value 1] and [Actual Value 2] respectively, and D0 and D1 are corresponding to [Standard Value 1] and [Standard
Value 2] respectively, as shown in Figure 3-1, the user can change the channel characteristics by adjusting (A0,D0) and (A1,D1),
the factory default (A0,D0) As shown in Figure 3-2, A0 is 0, A1 is 6000 (unit is 0.1℃)
Figure 3-2 Channel characteristics for each mode without changing the D0 and D1 values of each channel
(4) If the VC-4PT measurement value is 5°C (41°F) higher in actual use, the error can be eliminated by setting the two points
P0 (0, -50) and P1 (6000, 5950) of the characteristic adjustment, see Figure 3-3 for an example.
Figure 3-3 Example of characteristic change
4 Programming example
4.1 Programming example for VC series + VC-4PT module
As shown in the example below, the VC-4PT is connected to position 1 of the expansion module and uses channel 1 to connect to
a Pt100 RTD to output Celsius temperature, channel 2 to connect to a Cu100 RTD to output Celsius temperature and channel 3 to
connect to a Cu50 RTD to output Fahrenheit temperature, with channel 4 switched off and the number of average points set to 8
and the data registers D0, D1 and D2 to receive the The average value conversion result. The settings are shown in Figure 4-1 to
Figure 4-3. See the VC Series Programmable Controllers Programming Reference Manual for further details.
1) Create a new project and configure the hardware for the project as shown in the figure below.
6000
-1000
0
-950
A (0.1 ℃)
D (0.1 ℃)
P0
P1
-50
5950
D0 = -5 0; D1 =5950
6000
6000
－
1000
0
Factory setting (no adjustment)
－
1000
A
（
0.1
℃）
D
（
0.1
℃）

5
Figure 4-1 Hardware configuration
1）1) Double click on the "4PT" module to enter the 4PT setup screen - as shown below
Figure 4-1 First channel setup
3）Click on "▼" for the second channel mode configuration.
Figure 4-2 Second channel setup
4）Click on "▼" to configure the third channel mode and click on "Confirm" when finished；

6
Figure 4-3 Third channel setup
4.2 Characteristic change
If at this point channel 1 outputs 6000 when the actual measured temperature is 600°C, channel 2 outputs 1200 when the
actual measured temperature is 120°C and channel 3 outputs 2480 when the actual measured temperature is 248°F. Receive the
average conversion result with data registers D1, D2 and D3. The changes are shown in Figure 4-4. Note that the characteristic
changes are all in degrees Celsius. The range for setting the change value is within ±1000 (±100°C).
Figure 4-4 Channel characteristics change setting
5 Installation
5.1 Installation size
91.7 32
90
99.2
40
RUN
ERR
VC-4PT
VEICHI
24V R1+ RI-
I1-
I1+
COM
R2+ R2-
I2-
I2+
R3+ R3-
I3-
I3+
R4+ R4-
I4-
I4+
Figure 5-1 Mounting dimensions (in mm)

7
5.2 Mounting method
An illustration of the installation is shown in Figure 5-2
35m m wide D I N slot
Press back the DIN slot snap
IN
0UT
PWR RUN ERR
00 01 02 03 04 05 06 07
10 11 12 13 14 15 16 17
00 01 02 03 04 05 06 07
10 11 12 13 14 15
VC1-1614MAR
VEICHI
R UN
E RR
VC-4PT
VEICHI
24V R1+ R1-
I1-I1+COM
R2+ R2-
I2-I2+
R3+ R3-
I3-I3+
R4+ R4-
I4-I4+
Figure 5-2 Module installation
6 Operational check
6.1 Routine check
1. Check that the analogue input wiring meets the requirements (refer to 1.5 Wiring instructions).
2. Check that the VC-4PT expansion module is reliably plugged into the expansion connector.
3. Check that the 5V power supply is not overloaded. Note: The power supply for the digital part of the VC-4PT comes from
the main module and is provided via the expansion interface.
4. Check the application to ensure that the correct operating method and parameter range has been selected for the application.
5. Set the VC1 main module to which the module is connected to a RUN state.
6.2 Fault check
If the VC-4PT does not operate properly, check the following items.
● Check the status of the main module "ERR" indicator.
Blinking: check whether the expansion module is connectedand whether the configuration model of the special module is the same
as the actual connected module model.
extinguished: the expansion interface is correctly connected.
● Check the analog wiring.
Check that the wiring is accurate, refer to Figure 1-5.
Check the status of the module's "ERR" indicator
If the 24Vdc power supply is normal, then the VC-4PT is faulty.
Off: 24Vdc power supply is normal.
Check the status of the "RUN" indicator
Blinking: The VC-4PT is operating normally.

8
For Users
1. The scope of the warranty refers to the programmable controller body.
2. The warranty period is eighteen months. If the product fails or is damaged during the warranty period under normal use, we will
repair it free of charge.
3. The start of the warranty period is the date of manufacture of the product, the machine code is the only basis for determining the
warranty period, equipment without the machine code is treated as out of warranty.
4. Even within the warranty period, a repair fee will be charged for the following cases.
failure of the machine due to non-operation in accordance with the user manual.
Damage to the machine caused by fire, flooding, abnormal voltage, etc..
Damage caused when using the programmable controller for a function other than its normal function.
5. The service charge will be calculated on the basis of the actual cost, and if there is another contract, the contract will take
precedence.
6．Please make sure that you keep this card and present it to the service unit at the time of warranty.
7．If you have a problem, you can contact your agent or you can contact us directly.
Suzhou VEICHI Electric Technology Co., Ltd
China Customer Service Center
Address: No. 1000, Songjia Road, Wuzhong Economic and Technological Development Zone
Tel: [phone] Fax: [phone]
Service hotline: [phone] website: www.veichi.com com
Data version v1 0 filed on July 30, 2021
All rights reserved. The contents are subject to change without notice.
VEICHI Product Warranty Card
Customer
information
Company address:
Company
name:
contacts:
contact number:
Product
information
Product model:
Body barcode:
Name of agent:
Fault
information
Maintenance time and content:
Repairer:
Mailing
address
Suzhou VEICHI Electric Technology Co., Ltd
Address: No. 1000, Songjia Road, Wuzhong Economic and
Technological Development Zone