Dynalco SST-2400H Speed Switch/Transmitter - Manual (Page 28)

Response Time
Response time is the time required for the proportional
outputs to change from 10% to 90% of the maximum
calibrated value for an instantaneous step change of the
input frequency. Response time affects the transfer
speed of the relays.
Standard response time is 150 milliseconds over all
standard input frequency ranges: 0-80 Hz full-scale to 0-20,000 Hz full-scale.
Response times below 80 Hz full-scale are proportionally slower.
While other response times can be provided, field modification is not
recommended since damage might result that could void the product warranty.
Contact Dynalco if you need a different relay response time.
Adjusting Individual Set Points
1 Verify that the SST-2000A/H is calibrated to the correct full-scale
frequency range (see page 22).
2 Tools required: Either a very thin-bladed screwdriver or a
transformer alignment tool; signal generator (Dynalco’s F-16 or
equivalent).
3 Provide a signal source. Use an F-16 signal generator or similar
zero-crossing signal source, or use the frequency signal generated by
the magnetic pickup on the engine.
4 Apply a frequency signal to terminals 5 & 6. This frequency input
should equal the target RPM value of the set point being adjusted.
Setpoint Frequency (Hz) RPM x No. of teeth or holes =
on flywheel
60
For example: Calculate the set point frequency for a gear with 72 teeth rotating at
800 RPM.
Frequency (Hz) (800 ) (72 teeth)
60
960 Hz =
×
= (to terminals 5 & 6)
Alternate Method 1: Adjusting set points while the engine is not
running
Use a signal generator to adjust individual set points when the engine is not
operating and if you do not have an analog RPM meter.
1 Disconnect the wires to terminals 5 & 6. Mark or position the wires
to assure correct replacement.
28
Chapter 4
Contact Dynalco if
you need a different
relay response time.
RELAY RESPONSE