OJ Electronics VCH-3222-DI Instructions Manual

I N S T R U C T I O N S
VCH-3222-DI
67889A 08/23 (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: Example of application
Fig. 5: Wiring diagram (VCH-3222-DI)
Fig. 6: Orientation of VCH
Fig. 7: Example of input voltage min and max
INTRODUCTION
VCH-3222-DI is electronic a pressure/air con-
troller with integrated regulator output, and is
primarily used to control ventilation systems, eg.
roof ventilators using either constant pressure
or constant flow. VCH-3222-DI is designed for
controlling fans with analog interface.
VCH-3222-DI uses a semiconductor pressure
element with no air throughput, 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-3222-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.
Connection (VCH-3222-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
inputs. Digital input is used for start/stop.
Analog 0-10 VDC input controlls the setpoint
see fig. 5.
Setup menu
Use the buttons
the menu. The buttons can be found on the
backside off the lid. The menu is divided into
• English
three parts - Setup [ Set ], Regulator [ Reg ] and
Calibration [ CAL ]. Follow the menu scheme in
• Deutsch
figure 1 from the bottom up. Note some settings
• Français
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/voltage setpoint
(min/max)
Use Setup menu 3 to enter the min and max
pressure setpoint that the voltage on analog
input will work within.
Minimum is 0 Pa and maximum is 2500 Pa.
The max setpoint has to be lower than the Pres-
sure range. See fig. 7 for the example of Vmin
and Vmax.
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
7 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/voltage setpoint (min/max) [
Use Setup menu 6 to enter the min and max air
flow setpoint that the voltage on analog input
will work within.
The scale is 0.000 to 9999.
The max setpoint has to be lower than the Flow
range. See fig. 7 for the example of Vmin and
Vmax.
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
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.
Setup - Start/stop
Use setup menu 9 to enter digital input. Defines
how to use Start/Stop.
5 6
, and OK to navigate
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© 2023 OJ Electronics A/S
It is possible to choose between 0, 1 or 2. (2 is
default) See fig. 5, for an explaination.
Regulator menu
The VCH-3222-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 1000% 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.
] TECHNICAL DATA
Supply voltage
VCH-3222-DI ................24V~/= ±15%, 50/60 Hz
Power consumption .................................. 0.5 W
Output ......0-10 V=, 2-10 V=, 0-20 mA, 4-20 mA
Analog input ........................................................
] 1×0-10 VDC >20K Ohm input impedance
Digital input .............. 1×3,9KOhm Pull up to 12V
Measuring range, pressure ................. 0-2500 Pa
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