Wind Speed\Direction Transmitters
Air Temperature and Humidity
The Vayu, Model C45 WIND ALARM is a low-cost digital device which provides
overspeed protection for all types of machinery. Vayu senses
the period of the input signal in as little as one cycle,
providing rapid response when required.
It can also average the input signal from 2 to over 4000 cycles to smooth irregular signals or to slow response time.
The control will respond to signals with periods ranging from 30 minutes to 0.2 milliseconds.
The unit is crystal controlled for precise, repeatable operation. A double pole double throw relay capable of switching 10 Amps at 120 VAC provides a flexible connection to your equipment.
Vayu operates from a variety of AC and DC power supplies. Transducers are available to sense RPM, Linear Speed, Wind Speed, and Fluid Flow.
The C45 relay will close when the signal exceeds the high set point or falls below the low set point.
The relay is open when the signal is within its desired operating window.
The Vayu relay will close whenever the signal exceeds the On set point. A memory in the control causes the relay to remain closed until the signal drops below the Off set point.
This configuration is especially useful in control strategies where the change of state causes a dip in the input signal.
For example, this occurs when load is applied to an electrical generator. The hysteresis prevents the control system from chattering.
The anticipator is used in quickly accelerating machines to activate the relay in anticipation of the machine reaching its control set point.
This approach can greatly reduce shock forces. It has been successfully used to connect accelerating induction generators to the electrical mains (grid).
Controls with the D option display wind speed in miles per hour, meters per second or kilometers per hour. The display is independent of the control setting for the alarm and is updated approximately every two seconds. A 16 character liquid crystal display is provided.
Controls with the A option contain an integral sonic alarm. This creates a piercing continuous tone whenever an alarm condition is present. The output volume may be adjusted using the rotating shutter.
TIME DELAY OPTION
Vayu can be configured for one of the following Time Delay options:
Vayu APPLICATION NOTES
Higher performance sensors available.
105 to 127 VAC, 50/60 Hz, 4VA
80 - 250 VDC, 8 W
(specify at time of order)
|Input Device:|| A75-104 Anemometer.
Higher performance sensors available
|Displays:||One Light Emitting Diode (LED) to indicate relay coil energized. Optional Wind Speed display available.|
|Controls:||Unit may be field programmed by using an array of miniature switches.|
|Accuracy:|| 0.01% of set point. (Electronics)
Anemometer - see separate specifications.
|Response Time:||0.1 to 10 sec. typical.|
|Resolution:||1 in 65,000|
|Unattended Operating Period:||
100,000 contact transfers.
|Ambient Temperature Range:||-20 to 60° C.|
|Environmental Protection:||Surge Suppression on signal line.|
6"W x 8"H x 4"D.
7"W x 10"H x 4 1/2"D.
|Connectors:||Barrier strip to accommodate AWG#12 or smaller wire.|
|Maintenance:||Replace relay every 100,000 contact transfers.|