VICI Cheminert C52 Instruction Manual
1
Technical Note 819
Valco Instruments Co. Inc.
Cheminert®Model C52 and C62(Z) Injectors
Installation and Maintenance
The Cheminert®C52 (HPLC) and C62 (LC) series injectors are integrated motor/valve assemblies
designed specifically to be built into OEM systems.
Initial Precautions
After unpacking the injector, leave the protective cap over the valve ports until you are ready to install
the unit. As supplied, all surfaces are clean and free of contaminants, and must be kept clean to prevent
valve damage. Open ports and fittings cause unnecessary risk of particulate matter entering the valve
and scratching the sealing surfaces, which is the most frequent cause of premature valve failure.
WARNING
The most common source of particulate and chemical contamination is tubing which has not
been properly cleaned before installation in the valve. Failure to observe proper cleanliness
procedures during installation of the valve voids the manufacturer’s warranty.
Figure 1: Dimensions for models with single stage gearbox (top) and dual stage gearbox (bottom).
The shading indicates the area to check for a quick model identification.
(Gray items additional with serial option)
note at right
MOTOR WITH
SINGLE STAGE
GEARBOX
MOTOR WITH
DUAL STAGE
GEARBOX
8 AND 10 PORT MODEL C62
WITH 1/4-28 FITTINGS
This dimension is for Model C52.
Complete dimensional drawings for
all models can be found in the
support section of vici.com.
2
Note: On power up, the actuator is ready to move
from it current position to the opposite position. All
move requests are valid only to the opposite position
from the current position indicated.
Installation
Mounting
Mount the unit in a horizontal position. Avoid any orientation that positions the control board on the
bottom, where it could be damaged by leakage. Mounting hole locations are shown in Figure 1. There
are four 4-40 tapped mounting holes on the valve face of the gearbox and another four on the side of
the gear housing. NOTE: 8 and 10 port valves with 1/4-28 fittings have larger bodies which block the
mounting holes on the valve face, as highlighted in the red box of Figure 1.
Electrical Connections
Cables for electrical connections can either be ordered from VICI
or constructed in-house. To order from VICI, request product num-
bers I-25176 for the I/O control cable and I-24780 for the power
cable.
If you prefer to make your own cables for I/O control and power:
1. Use a Molex 26-03-4020 shell and 08-58-0111 contacts with
22 awg stranded wire to supply 24 volt current (3 amps recom-
mended) to the connector marked J1. (See Figure 3.) The motor
can draw as much as 2.5 amps during movement so make sure
there is adequate power available, and do not share power with
other sensitive circuits.
2. Use an Amphenol 65846-015LF shell and 47715-000LF contacts
to make the connection to Connector J3, which provides the
contact closure input and detects the output of the position sensor.
(See Figure 4 and Table 2.)
Position feedback is obtained from the A and outputs shown
in Figure 4. These are 5 volt tolerant, 3 volt logic outputs,
sourcing and sinking a maximum of 20 milliamperes each.
An output will go high (+3V) when the valve reaches the
respective position.
Caution:
Do not attempt to source or sink more than 20 mA from either
output.
Figure 3:
Power connector J1, pin view
Figure 4:
Control connector J3, pin view
Table 2: Connector J3
pin assignments
(Colors are in reference to
VICI cable I-25176)
Valve Schematics and Switching Times
Figure 2:
Valve schematics
Table 1:
Time to required
to switch A to B
(or B to A)
Single stage Dual stage
4 pos. 155 ms 6 pos. 347 ms
6 pos. 118 ms 8 pos. 307 ms
8 pos. 104 ms 10 pos. 279 ms
10 pos. 91 ms 12 pos. 231 ms
3
Table 3: Control logic
“1” indicates contact closure to common;
“X” indicates ignored
Motor Control Modes
Single Contact Closure Control (default)
In this mode, applying and maintaining a connection between the common and “B contact” pins keeps
the injector in the load position (A). Releasing the contact returns the injector to the inject position
(B). This logic permits position B (inject) to be the default position – that is, the state the injector will
be when the instrument power is off.
Dual Contact Closure Control
In this mode, holding a contact closure (50 msec
minimum) between the “A contact” and common
on connector J3 moves the injector to position A
(inject). The injector does not move when the
contact closure is released. Likewise, providing
a contact between the “B contact” and common
moves the injector to the B (load) position.
Contact closures must be released before the
opposite closure can be applied. To change the
actuator to this mode, see instructions in the next
section.
Jumper Settings
Factory-set jumpers determine the actuator motor’s control mode
(single contact closure) and proper angle of rotation (a function
of the number of ports in the valve head).
Figure 5 shows the jumper location, with a jumper installed at
position 1. Jumper 4 must remain empty in two position applica-
tions. (For multiposition applications, refer to Technical Note 821.)
A verbal presentation of the configuration information begins below.
For a graphic presentation of the decision process, refer to Figure 7.
Setting the Motor Control Mode
Jumper 1 sets the control mode. When shipped from the factory,
the mode is set to single contact closure control (no jumper
installed). To change the control mode to dual contact closure:
1. Interrupt power to the motor by detaching power connector J1.
2. Install a jumper on the pair of pins at position 1, as shown in Table 4.
3. Re-attach connector J1. The change takes effect when the motor is
powered up.
To change back to single contact closure control, follow the same procedure but remove the jumper
in Step 2.
Table 4: Control mode
jumper settings
Figure 5: Location of jumpers
JUMPERS
4
Table 5: Jumper settings
for number of ports
Setting the Angle of Rotation
If you are changing the valve head to one with a different number
of ports, jumpers 2 and 3 must be reconfigured. Remember that
jumper 4 must remain empty for two position applications.
To set the motor for the proper amount of rotation:
1. Interrupt power to the motor by detaching power connector J1.
2. Refer to Figure 1 to determine if the unit has a single stage
gearbox or a dual stage gearbox.
3. Consult Table 5 to determine the correct jumper arrangement, and install jumpers as indicated.
4. Re-attach connector J1. The change takes effect when the motor is powered up.
Restoring the Default Baud Rate
To restore the baud rate to the factory default of 9600:
1. Interrupt power to the motor by detaching power connector J1.
2. Remove jumpers 3 and 4, noting their location for proper reinstallation.
3. Install a jumper as shown in Figure 6.
4. Re-attach connector J1. The rate change takes effect when the motor
is powered up.
5. Detach power connector J1 and restore jumpers 3 and 4 to their previous configuration.
6. Re-attach connector J1.
Figure 6: Jumper
position to restore
default baud rate
5
Dual stage gearbox
6 port
8 port
10 port
12 port
6 port
8 port
10 port
12 port
6 port
8 port
10 port
12 port
6 port
8 port
10 port
12 port
(Not recommended for use
(with serial port control)
Figure 7: Decision tree for setting jumpers.
NOTE: The gearbox type is sensed automatically. For a visual determination, refer to Figure 1.
6
Actuators with Optional Serial Control (must be specified at time of purchase)
RS-232 and RS-485 communication require a terminal emulation program.There are many emulators
available for free on the internet. Though the programs vary, in general you will select “Serial” from
among various types of connections, select the COM port which will be used, name the connection,
and set the port baud rate as shown in Table 7 (9600, or 9K60, is the factory default). The rest of
the configurations are fixed at no parity, 8 data bits, 1 stop bit, no hardware or software handshaking.
A three-pin connector is used for the serial interface: pin assign-
ments are listed in the table at right. Use VICI cable I-22697
or make your own with the parts named below the table. The
implementation of RS-485 is half-duplex two wire with ground,
and uses the same 3 pin output connector as RS-232.
With the software running, check the communication link
between the computer and the serial port by typing /?<enter>.
If the link is functioning, the menu below will appear on your
monitor:
Control Command List
GO[nn] Move to nn position
CW[nn] Move Clockwise to nn Position
CC[nn] Move Counter Clockwise to nn Position
CP Returns Current Position
SB[nnnnn] Set the Baud Rate to nnnnn
VR Firmware Version
/? Displays This List
Figure 8: Serial boards
Table 6: Pin assignmentss
7
Serial Communication Protocol
Serial communication is based on an ASCII string protocol. Carriage Return (OD hex) characters
parse the communications by defining the end of each command. Software flow control (Xon/Xoff) and
hardware handshaking are not supported. Table 7 describes and explains all the commands available.
A couple of simple examples are provided below.
CP Displays the current position of the actuator
Example
Command: CP<enter>
Returns (via the serial port) the current position,
either A or B
SB [nnnn] Sets the baud rate, where
nnnn = a value from the table at right
Example
Command: SB19K2<enter>
Sets the baud rate to 19200
Baud rate nnnn
4800 4K80
9600 9K60
19200 19K2
38400 38K4
57600 57K6
115200 115K
Table 7: Commands and descriptions
Table 8: Baud rate values
8
Additional Information on the RS-485 Option
Hardware Protocol
The RS-485 hardware protocol is half-duplex implementation – two wires with a ground. There are
two connectors which are connected in parallel to allow easy daisy chaining of multiple devices.
Hardware Termination
The RS-485 port on the host computer or controlling device generally includes terminating resistors,
so on short cables no termination is required. However, if many devices are attached and/or the
actuator is on the end of a long communication cable, the termination jumpers on the furthest device
from the master RS-485 controller should have termination enabled. To use termination resistors,
install a jumper on the header labeled HDR1, oriented as shown in Figure 8 on page 6.
Hardware ID Set
The firmware requires a serially-addressed ID, which on this board is set by the 16 position rotary
switch labeled SW1. The ID is set either as a number from 0 - 9 or a letter from A - F, as selected
by the arrow on the face of SW1.
Software Protocol
The software protocol requires a forward slash [/] as a beginning-of-message character, followed
by a single character ID. The end-of-message character which terminates the command is a <CR>.
The standard RS-232 serial port commands are then supported within that protocol.
Example:
With the settings in Figure 8, the RS-232 command VR<enter> becomes /0VR<enter>
in the RS-485 protocol; /is the start-of-message character, 0is the current ID of the device,
and VR<enter> is the command to be executed.
NOTE: Of the commands on listed on page 7, E+/E-, LF+/LF-, and QS+/QS- work only for RS-232;
they are not available in RS-485 operation.
TN-819 REV 6/20
Figure 10:
Loosening and tighening order
Figure 9:
Exploded view of a
typical injector
Cleaning and Rotor Replacement
These valves have polished sealing surfaces
which must be protected during any disassembly
or cleaning procedure. Work in a clean environ-
ment and always set parts on a soft tissue or clean
paper. Cleaning a valve can often be accomplished
by flushing all the lines with appropriate solvents.
Do not disassemble the valve unless system
malfunction is definitely isolated to the valve.
Disassembly (Refer to Figure 9)
1. Use a 3/32" hex driver to remove the 5-40 socket
head screws that secure the stator to the valve body. Alternate among the five screws in the sequence
indicated in Figure 10, loosening them in quarter-turn (90°) increments until all load is removed.
2. To ensure that the sealing surface of the stator is not damaged, rest it on its outer face. Or, if the
tubing is still connected, leave it suspended by the tubing.
3. With your fingers or a small tool, gently pry the rotor away from the driver.
4. Examine the rotor sealing surface for scratches. If you see any, the rotor should be replaced.
5. Examine the stator sealing surfaces. If scratches are visible between the ports, that part should be
replaced or resurfaced. Call VICI for help in determining if resurfacing is feasible.
6. Clean all the parts thoroughly with an appropriate solvent, taking care that no surfaces get scratched.
(A common problem with HPLC is the formation of buffer crystals, which are usually water-soluble.)
It is not necessary to dry the rotor.
Reassembly
1. Replace the rotor in the driver, making sure that the rotor sealing surface with its engraved flow
passages is facing out. The tabs on the rotor have an asymmetrical pattern to prevent assembly
with improper orientation.
2. Replace the stator. Insert the five socket head screws and tighten them gently until they start to get
snug. Alternate among the five screws in the sequence indicated in Figure 10, tightening them in
quarter-turn (90°) increments until the stator is flush against the valve body.
Do not overtighten the screws – they simply hold the assembly together and do not affect the seal-
ing force, which is automatically set as the screws pull the stator against the valve body.
3. Test the valve by pressurizing the system. If it doesn’t hold pressure, the valve should be returned
to Valco for repair.
This manual suits for next models
2
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