OJ Electronics VCH-2 Serie Instrucciones

I N S T R U C T I O N S
VCH-x2xx-DI
67643D 04/21 (PBV)
English
LIST OF FIGURES
The following figures are located at the back of
the instructions:
Fig. 1: Menu scheme
Fig. 2: Dimensioned drawing
Fig. 3: Position of measurement tube in relation
to bends and branches
Fig. 4: Wiring diagram (VCH-6201/3202-DI)
Fig. 5: Example of application
Fig. 6: Wiring diagram (VCH-3212-DI)
Fig. 7: Orientation of VCH
INTRODUCTION
VCH-6201-DI and VCH-32x2-DI is electronic
pressure/air controller with integrated regula-
tor output, and is primarily used to control
ventilation systems, eg. roof ventilators using
either constant pressure or constant flow. VCH-
6201-DI is designed for controlling motor drives
(OJ-DV) with Modbus interface, and VCH-32x2-
DI is designed for controlling fans with analog
interface.
Both types uses a semiconductor pressure
element with no air throughput, thus protecting
the unit from dust in the ventilation system. The
pressure element is temperature compensated
to provide accurate pressure measurement
throughout the specified temperature range.
See 'Technical Data'.
INSTALLATION
VCH-x2xx-DI should be attached to a firm,
level surface using two screws. The pressure
controller also functions with only one tube
fitted to the tube connectors (+ or -). However,
two tubes should always be fitted to maintain
the enclosure rating.
Pressure is supplied to the measurement unit by
tubes, the higher pressure being connected to
the '+ tube connector' and the lower pressure
to the '÷ tube connector' (see fig. 4).
The pressure tubes must be as short as pos-
sible and must be secured in position to prevent
vibration.
To obtain the best possible results, pressure
must be measured where there is least risk of
turbulence, i.e. in the centre of the ventilation
duct and at a distance of at least twice the
width of the duct from bends and six times the
width from branches (see fig. 3).
The housing is opened without the use of tools
by pressing the snap lock beside the tube con-
nectors.
Modbus cable connection (VCH-6201-DI)
Use the four screw terminals to connect the
Modbus cable from the OJ-DV. Note, that the
connection to the OJ-DV uses the slave port.
Please see the OJ-DV instruction.
The connection to the OJ-DV provides the 24
VDC power supply, see figure 4.
• English
Analog cable connection (VCH-3202-DI)
The output from the VCH is either voltage or
• Español
current controlled. The VCH must be provided
with a 24 VAC/DC power supply, see figure 4.
Analog cable connection (VCH-3212-DI)
The output from the VCH is either voltage or
current controlled. The VCH must be provided
with a 24 VAC/DC power supply and has two in-
puts to choose between 4 setpoints, see fig. 6.
Setup menu
Use the buttons
the menu. The buttons can be found on the
backside off the lid. The menu is divided into
three parts - Setup [ Set ], Regulator [ Reg ] and
Calibration [ CAL ]. Follow the menu scheme in
figure 1 from the bottom up. Note some settings
may be hidden depending on other selections.
Setup - Pressure or flow mode
Use Setup menu 1 to choose between Pressure
or Flow mode.
Setup - Pressure range
Use Setup menu 2 to enter the pressure range.
Set the Pressure range to match the system
pressure working range.
Setup - Pressure setpoint
Use Setup menu 3 to enter the pressure set-
point.
Versions with several setpoints: Choose the
number of setpoints and setup the values for
each one.
Minimum is 0 Pa and maximum is 2500 Pa.
Setting the minimum setpoint to 0 will halt the
ventilation.
The setpoint has to be lower than the Pressure
range.
Setup - k-factor
Use Setup menu 4 to enter the K-factor. Mini-
mum k-factor is 0.001 and maximum k-factor is
9999. Please see the conversion table on page
6 for help to calculate the k-factor. The dot
position shall be set before entering the value.
Setup - Flow range
Use Setup menu 5 to enter the flow range. Set
the Flow range to match the system flow work-
ing range. The dot position shall be set before
entering the value. The selected dot position
will also apply to the display, when showing the
current flow.
Setup - Flow setpoint
Use Setup menu 6 to enter the air flow setpoint.
Versions with several setpoints: Choose the
number of setpoints and setup the values for
each one.
The scale is 0.000 to 9999. Setting the setpoint
to 0 will halt the ventilation.
The setpoint has to be lower than the Flow
range.
5 6
, and OK to navigate
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© 2021 OJ Electronics A/S
Setup - Damping
Use Setup menu 7 to enter the damping.
Minimum damping is 1 seconds and maximum
damping is 30 seconds. A low damping can
result in unsteady readings, while a higher
damping gives a more steady reading but also a
slower response time for the regulation.
Setup - Analog output type
VCH-32x2-DI Only: Use Setup menu 8 to enter
the analog output mode. It is possible to switch
between 0 - 10 VDC, 0 - 20 mA, 2 - 10 VDC and
4 - 20 mA as regulator output.
Regulator menu
The VCH-x2xx-DI default PI values will fit most
systems. Only change the values if it is required
or for optimization needs.
Regulator - Integrator time
Use Regulator menu 1 to set the integrator time.
Minimum integrator time is 1 second and maxi-
mum integrator time is 9999 seconds. A low
value can make the system unstable and a high
value can give a slow regulator response.
Regulator - Proportional band
Use Regulator menu 2 to set the proportional
] band. Minimum proportional band is 10% and
maximum proportional band is 100% of the
Pressure/Flow range. A low value can make the
system unstable and a high value can give a
] slow regulator response.
Regulator - Dead band
Use Regulator menu 3 to set the dead band.
Minimum dead band is 1% and maximum dead
] band is 50% of the Pressure/Flow setpoint
[ / ]. If the regulator is used to control
a damper, choose a higher value to avoid exec-
sive activity.
Regulator - Minimum regulator output
Use Regulator menu 4 to set the minimum
regulator output. Minimum regulator output can
be set between 0% and 50%.
Regulator - Maximum regulator output
Use Regulator menu 5 to set the maximum
] regulator output. Maximum regulator output can
be set between 50% and 100%.
Calibration menu
When calibrating, make sure the VCH are in a
pressure free environment. To obtain a pressure
free enviroment remove the two air tubes on the
] VCH. For caution reasons, each calibration will
only calibrate ±5 Pa.
Calibration
Use Calibration menu 1 to calibrate. Confirm by
pressing [ ].
Factory reset
] Use Calibration menu 2 to set the VCH back to
factory reset. Confirm by pressing [
LED INDICATOR
Front
A LED on the frontside of the VCH indicates
the operating status. A constant red lit means
the operating range is not reached. Contrary a
constant green lit means the operating range is
reached. A flashing red lit means that an error is
active. See Troubleshooting for more informa-
tion.
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