Dynalco SST-2400H Speed Switch/Transmitter - Manual (Page 5)

About your speed switch
The SST-2000A/H series is a speed switch and signal transmitter that provides
alarm set points for over- and underspeed control for sequential, startup, and
shutdown switching for:
t engines
t machines
t I/P drivers
t instrumentation
t process control
t recording
t measurement
How it works
The SST-2000A/H accepts a full-scale frequency input value from 0–0.1 Hz
(6 pulses per minute) to 0–50,000 Hz. Standard: 0–80 Hz to 0–20,000 Hz.
Examples of input devices include:
t
passive or active magnetic pickups
t
shaft encoders
t
contact closures
t
flow meters
t
photocells
The speed switch converts frequency input (speed, rate) into linear proportional
dc outputs:
t 0–1 mA (standard - meter out)
t 4–20 mA (standard - proportional out)
t 0–5 Vdc (switch selectable)
t 0–10 Vdc (switch selectable)
It provides 0, 2, or 4 relay trip set points (depending on the model)
2
Chapter 1
When the SST-2000A/H Series Speed Switch/Transmitter is
used as the primary overspeed shutdown device, it must be
tested regularly.
WARNING