Dynalco SST-2400H Speed Switch/Transmitter - Manual (Page 29)

2 Apply the calculated set point frequency to terminals 5 (HI) &
6 (COM).
3 Apply operating power to the SST-2000A/H. See lid of your
SST-2000A/H or spec sheet for power choices.
4 Select the appropriate set point trim pot.
5 Turn the pot:
t
Counterclockwise to lower the set point value (reduce the speed at
which the set point relay will trip ).
t Clockwise to raise the set point value (increase the speed at which
the set point relay will trip).
6 Turn the pot slowly so as not to pass the target set point by a large
amount. The pot has fine resolution, so a large change in set point
value may take several turns.
7 While adjusting the pot, listen for the relay to trip at the set point.
You can hear a distinct click when the contacts transfer. If high
ambient noise makes it impossible to hear the relay click: use an
ohmmeter as described in Alternate Method 2, below.
8 Fine tune the adjustment:
t After the relay trips, slowly REVERSE the adjustment of the set
point pot until the relay again trips.
t
Again, slowly turn the pot FORWARD until the relay trips.
9 Reattach the wires to terminals 5 (HI) & 6 (COM). Observe polarity.
10 Repeat the above procedure for other set points to be changed.
Alternate Method 2: Adjusting Individual Set Points While The
Engine Is Operating
A non-critical overspeed value is one that will not stress the engine. Use Alternate
Method 3 to adjust set points while the engine is operating at a non-critical
speed. NOTE: when the set point value is reached the relay will cause an engine
shutdown or activate whatever is connected to that relay.
A critical overspeed is typically the actual engine shutdown overspeed; running
the engine at this speed is generally not desired. Use Alternate Method 1 if you
cannot guarantee engine overspeed.
1 Run the engine at the desired speed using:
29
Calibrating the Speed Switch
Use Alternate Method 3 to adjust set points while the
engine is operating at NON-CRITICAL speed only.
WARNING: DO NOT RUN AT OVERSPEED