Alicat Scientific EPCD Series Bedienungsanleitung
Models EPCD · EPC
2
Thank you for purchasing your OEM pressure controllers.
Alicat Scientific
World Headquarters
M/s Halma India Pvt. Ltd.
C/O Avire India Pvt. Ltd.
Plot #A-147, Rd. #24
Wagale Ind. Estate, Thane
(West) 400604,
Maharashtra, India
+1 888-290-6060
info-cn@alicat.com
alicat.com.cn
2nd Floor, Block 63, No.
421, Hong Cao Rd,
Shanghai, PRC 200233
+86-21-60407398 ext.
801
europe@alicat.com
Geograaf 24
6921 EW Duiven
The Netherlands
+31 (0) 26 203.1651
This device comes with a NIST traceable calibration
certificate.
This device conforms to the European Union’s Restriction of
Use of Hazardous Substances in Electrical and Electronic
Equipment (RoHS) Directive 2011/65/EU.
This device complies with the requirements of the Low
Voltage Directive 2014/35/EU and the EMC Directive
2014/30/EU and carries the CE Marking accordingly.
This device complies with the requirements of the European
Union’s Waste Electrical & Electronic Equipment (WEEE)
Directive 2002/96/EC
Rev. 3 • 2020-08-24 • DOC-EPCMAN
4
Getting Started
Mounting
EPC and EPCD-Series controllers have mounting holes for convenient
mounting to flat panels. These controllers are position insensitive and can be
mounted in any orientation.
EPC
EPCD
Caution:
Minimize physical handling of the exposed circuit board of the EPC or
EPCD while installing. Hold the circuit board on its edges while installing, in order
to minimize contact with the exposed circuit board of the EPC or EPCD.
5
Plumbing
Process Ports
Your instrument is shipped with plastic plugs fitted in the port openings. To
lessen the chance of contaminating the flow stream do not remove these
plugs until you are ready to install the device.
Controllers with M5 (10-32) ports have O-ring face seals and require no sealant
or tape. Do not use tape with welded or O-ring fittings.
For non M5 (10-32) ports use thread sealing Teflon® tape to prevent leakage
around the port threads.
Do not wrap the first two threads. This will minimize the possibility of getting
tape into the flow stream and flow body.
!
Warning: Do not use pipe dopes or sealants on the process connections, as these
compounds can cause permanent damage to the controller should they get into the
flow stream.
When changing fittings, carefully clean any tape or debris from the port
connections.
Maximum Pressure
Both the valve and the sensor can be damaged from over-pressurization. The
valves on an EPC or EPCD are rated to 150 PSIG, unless custom-ordered. The
burst pressure of the pressure sensor is 3x the full scale, and permanent
damage will occur if this is exceeded.
Pressure Controller Operation
The response time of the system will depend on the size of the volume being
controlled, the operating conditions, and the PID tuning of the device. The
controllers are intended for use with clean, non-corrosive gases only.
6
EPC Single Valve Controller
Alicat Scientific EPC-Series Pressure Controllers incorporate a digital pressure
gauge with a single control valve and circuitry. The integrated control
algorithm measures the pressure, compares it with the setpoint, and adjusts
the valve accordingly at 1000 times per second.
The response time of the system will depend on the operating conditions and
the PID tuning of the device.
EPC-Series Pressure Controllers are normally intended to control the process
pressure downstream of the controller. In order for this to occur, a supply
pressure greater than the full scale pressure control range of the device
should be connected to the “IN” port.
EPC-Series Pressure Controllers can also be configured as back pressure
controllers, opening to release pressure upstream of the controller, and
closing to increase restriction and increase pressure upstream of the
controller. EPC Back Pressure controllers will have a “DS” in the part number.
EPCD Dual Valve Controller
Alicat Scientific EPCD-Series Closed Volume Pressure Controllers incorporate
a digital pressure gauge with dual control valves and circuitry. The integrated
PID loop measures the pressure, compares it with the setpoint, and adjusts
either the Inlet or Exhaust valve accordingly at 1000 times per second.
They are designed with a feed port, a process port, and an exhaust port. This
allows the controllers to raise and lower the pressure of a closed system
within the operating range of the controller without wasting gas under
constant pressure conditions.
Connect your EPCD into your process via the “OUT” port of the
unit. This is the “Process” port.
Connect a supply pressure greater than the full scale pressure
control range of the device to the “IN” port.
The “VENT” port can vent to atmosphere or be tied to a vacuum
source as the application demands.
✓
Note: The pressure at the vent port should be at atmospheric pressure or
below to allow the controller to be used over its full scale range.
7
Power and Signal Connections
Power and communications are supplied through the 6 pin Molex Micro-Fit
3.0 connector:
Pin
Function
1
Power in
2
0–5 Vdc
Optional: 1–5 Vdc or 0–10 Vdc output signal
3
Ground (common for power, digital
communications, and analog signals)
4
Serial RS-232TX output signal
Optional: RS-485 B
5
Serial RS-232RX input signal
Optional: RS-485 A
6
Analog setpoint input
Caution: Do not apply power to pins 2, 4, 5, or 6. Permanent damage can occur.
RS-232 or RS-485 Digital Signals
To use the RS-232 or RS-485 input signal, connect the RS-232 / RS-485 Output
Signal (Pin 4), the RS-232 / RS-485 Input Signal (Pin 5), and Ground (Pin 3) to
your computer serial port as shown below.
DB9 to MF6 Connection for RS-232 or RS-485 Signals
9-Pin Serial Connection
MF6 Connection
Pin
Function
Pin
Function
5
Ground
3
Ground
3
Transmit
5
Receive
2
Receive
4
Transmit
8
Analog Signals
Analog Output
Most devices include a primary analog output signal, which is linear over its
entire range. For ranges that start at 0 Vdc, a zero-pressure condition is
indicated at approximately 0.010 Vdc. Full scale pressure is indicated by the
top of the range: 5 Vdc for 0-5 Vdc, 10 Vdc for 0-10 Vdc, and so on.
Serial Communication
Establishing Serial Communication
After connecting your flow controller using a communications cable, you will
need to establish serial communications through a real or virtual COM port
on your computer or programmable logic computer (PLC).
•If you have connected your device to a serial port, note its COM port
number. This can be found in Windows® Device Manager.
•If you have a serial to USB adapter, plug it into your computer, ensure the
proper driver is installed, and note the COM port number.
The controller will be configured with the following settings:
•Baud: 19200 (default; others can be used if the computer, its software
and the controller are all set to the same rate)
•Data bits: 8
•Parity: none
•Stop bits: 1
•Flow control: none
Alicat devices use ASCII commands which are easily used in a serial terminal
or integrated into a PLC.
✓
Note: In what follows,
indicates an ASCII carriage return (decimal 13,
hexadecimal D). Serial commands are not case-sensitive.
9
Polling Mode
Controllers are shipped in polling mode with a unit ID of A, unless requested
otherwise. Each poll returns one line of data. To poll, simply enter its unit ID.
Poll the device: [unit ID]
Example: a(polls unit A)
You can change the unit ID of a polling device by typing:
Change the unit ID: [current unit ID]@=[desired unit ID]
Example: a@=b(changes unit A to unit B)
!
Warning: Care should be taken not to assign the same unit ID to more than one
device on a single COM port.
Streaming Mode
In streaming mode, your device continuously and automatically sends a line
of live data at regular intervals. Only one unit on a COM port may be in
streaming mode at a time.
✓
Note: RS-485 does not support streaming mode
To put your controller into streaming mode, type:
Begin streaming: [unit ID]@=@
Example: A@=@(Begins streaming unit A)
This is equivalent to changing the unit ID to “@”. To take the flow controller
out of streaming mode, assign it a unit ID by typing:
Stop streaming: @@=[desired unit ID]
Example: @@=a(stops and assigns unit ID of A)
When sending a command in streaming mode, the flow of data will not stop
while the user is typing. This may make the commands you type unreadable.
If the device does not receive a valid command, it will ignore it. If in doubt,
simply hit and start again.
The default streaming interval is 50 ms, but this can be increased by changing
Register 91 while the device is in polling mode:
Set streaming interval: [unit ID]w91=[time in milliseconds]
Example: aw91=500(streams data every 500 ms)
10
Taring
Taring pressure aligns the internal gauge pressure sensor with the current
barometric pressure, and must be done with the EPC/EPCD pressure sensor
open to atmosphere:
Tare gauge pressure: [unit ID]p
Example: ap
!
Warning:Do not send tare commands on absolute pressure EPC/EPCD
Collecting Pressure Data
Collect live data by typing the [unit ID]command or by setting your
controller to streaming. Each line of data for live measurements appears in
the format below, but Unit ID is not present in streaming mode.
The data frame on the screen represents the current measurements in the
device in the units shown on the display. By default, pressure controllers are
configured to output three columns of data.
A
+50.42
50.42
|
|
|
Unit ID
Pressure
Setpoint
Single spaces separate each parameter, and each value is displayed in the
chosen device engineering units. You can query the engineering units of the
serial data frame by typing:
Query live data info: [unit ID]??d*
Example: a??d*
(returns the data frame descriptions)
Additional columns, including status codes, may be present to the right of the
last column.
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