SR 4000 Speed Relay
Standard Series
Comprising Product Code SR4### – ?
Dual Ac Supply Standard (Optional – 12/24 Volt Dc)
Easy Setting Of Required Trip/Alarm Speed Directly In Rpm
Extensive range of optional features including automatic start delay (refer to additional information on automatic start delay operation)
Multiple Ranges, Fixed Start Delay, Etc.
Three speed ranges are available on each module. Standard ranges are 1-10 rpm, 1-100rpm and 1-1000 rpm. The required range being selected by link on the terminal rail. Other modules are available with ranges covering the speeds 0.01 rpm to 20,000 rpm.
During normal operation, the module energises the output relay when the shaft speed rises above the set level and de-energises it when the speed falls below the set level.
Front mounted LED’s indicate power on, relay energised, input signal status.
Optional Automatic Start Delay
The following option can be included to any SR 4000 type unit.
The automatic start delay on the SR 4000 speed relays operates as follows:
First, as soon as the main drive starts and the Rotech Motion Sensor/Encoder begins to rotate, the system initiates the start delay.
Next, the start delay energises the SR 4000 speed relay for 20 seconds.
During this time, the drive should reach its normal operating speed; consequently, the speed relay remains energised once the drive reaches that speed.
However, if the drive fails to reach its normal running speed within the 20-second period, the speed relay de-energises and the drive shuts down.
Finally, the system will only re-activate the 20-second start delay if the drive speed drops below 1 RPM and remains below 1 RPM for 20 seconds.
