Frequency Monitors
Description
The Model 2922 Frequency Monitor is designed to monitor power line frequency. It is intended for systems where line frequency variations will cause improper operation of electrical equipment.
A solid-state sensing circuit drives two internal electromechanical relays. One relay is energized when the line frequency is high and the other relay is energized when the line frequency is low. Operating power is drawn from the same line being monitored.
The Model 2922 is set to the over and/or under frequency trip points using ten binary-coded switches. A frequency variation outside the trip points causes the appropriate relay to energize and an appropriate LED indicator to illuminate.
Applications for the Model 2922 include standby power plants, portable power supplies, and windmill generators.
Specs
| Model | 2922-XXX | |
| Input Voltage | XXX= 24, 120 or 240 | |
| Operating Frequency | 45-1023 Hz | |
| Response Time | 1 second | |
| Transient Protection | 2500VRMS for 10msecs | |
Contact Rating | SPDT x2 10amps at 240VAC resistive | |
| Expected Relay Life | Mech: 10 million operations Elec: 100,000 operations at rated load | |
| Operating Temp | - 40º to +122º F | |
| Humidity Tolerance | 0-97% without condensation | |
| Enclosure Material | ABS Plastic | |
| Weight | 12 oz. | |
| ORDERING: | ||
Model | Nominal (VAC) | Operating Voltage |
2922-24 | 24 | 20-30 |
2922-120 | 120 | 90-130 |
2922-240 | 240 | 190-240 |