Varifan VSD-1MC-20, Руководство пользователя

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VSD-1MC-20(40)
Page 7
The VSD-1MC-20(40) module uses a 0-10 Volts or a 4-20 mA signal to make an
output modulates. User can adjust the fan minimum speed with the potentiometer
located inside the module box on the electronic board (refer to figure 2). That
Minimum Speed Potentiometer is used to adjust the speed when the master
control input signal is at its lowest value.
User can also set how the fan will operates when the input signal is at or below 5%
of its total range. Refer to the logic diagrams at figure 4 and 5 to know the exact
values and behavior of the different switches configurations. The fan can either
continue to run at minimum speed (Shutoff 5% Switch set to OFF) when the input
has reach its minimum value or can stop when the input reach 5% of its total range
(Shutoff 5% Switch set to ON). With the Shutoff at 5% Switch set to ON, a
differential is applied in order to avoid equipment wear. Refer to figure 4 for the exact
value of the differential. Also refer to figure 2 for the location of the Shutoff 5%
Switch.
Another switch also located on the electronic board will select if the input is a 0-10
Volts (0-20 mA) or a 2-10 Volts (4-20 mA) signal. Refer to figure 2 for the location of
the Input Range Switch.
Finally, a jumper (JP1) must be set to determine the input type used. Two types are
available which are: 0-20 mA (jumper on the 2 left pins) and 0-10 Volts (jumper on
the 2 right pins). Refer to figure 2 for the location of the Input Type Jumper.
Here is a description of the VSD-1MC-20(40) operation:
- If the Shutoff 5% Switch switch is set to OFF, the fan will run continuously at its
minimum speed when the input reads it lowest value. If the Shutoff 5% Switch is
set to ON, the fan will stop when the input is at or below 5% of its total range. A
differential is applied to the 5% value. Refer to figure 4 for the exact value of the
differential.
- If the input reads above its minimum value (or 5% if the Shutoff 5% Switch is
set to ON), the fan will modulate from its minimum speed to 100% of its
maximum speed. The full speed will be reached when the input reads 10 Volts or
20 mA.