The Model 60-23P Under Speed Switch provides a low-cost, dependable, versatile and simple means of monitoring the rotational velocity of a shaft or other rotating equipment.

It monitors speed by sensing a ferrous element attached to the rotating shaft or equipment. The detector generates pulses from the ferrous element and closes an alarm contact when the time between pulses is greater than the time adjusted by the setpoint. The unit operates on the number of pulses received, rather than in actual revolutions. Low speed range may be enhanced by increasing the number of ferrous elements on the rotating shaft.

The 60-200 programmable motion monitor is a versatile microprocessor-based controller that can be used with any of the sensors offered by Thermo Ramsey, or in some cases, as the control device matched with compatible pulse output sensors from other sources.

All alarm functions, delays and operating parameters are entered via a simple three button keyboard. There are no potentiometers to adjust. A four digit, seven segment display will display current speed as a percentage relative to a user programmed reference speed. It is also used to display various parameters and set-up values when the control is in its set-up mode. Finally, the display will show an error code if any problems occur. This helps the operator troubleshoot any system failures.

Detailed programming instructions are contained in the system manual and a quick reference programming guide is displayed on a label on the inside of the control’s enclosure cover. One or two DPDT outputs are available from the 60-200 (depending on whether the single or dual channel model is used) for output of monitored conditions to remote alarm displays or control functions. Also available is a 0 to 2 VDC output or operational 0-20mA, 4-20mA signal proportional to the rotational speed of the shaft being monitored.

Alarms can be set at 1% increments over a range of 0 - 160% of reference speed. With the dual channel 60-200-2 model, one output can be set for overspeed and one for underspeed, or both for underspeed or overspeed. (For example: Setting both outputs at underspeed, one at 90% for alarm and one at 80% for shut-down). Other programmable set-up features include start-up delay, alarm delay, and restart mode.

For technical specifications and dimensional data on the 60-200 Motion Monitor Control, refer to catalog 20.620.