Dynalco SST-2400H Speed Switch/Transmitter - Manual (Page 18)

Driving an SPV-200 Solenoid Pneumatic Valve
The SPV -200 coil has a resistance of 50 Ω and requires 6 Vdc to trip.
Switching the Regulated 14 Vdc Supply
The regulated 14 Vdc supply at terminals 11 (+) & 4 (–) does not have the
capacity to drive the SPV-200 continually.
When the SST-2000A/H speed transmitter is supplied with the Pneumatic Trip
Option for Overspeed, Relay 1 transfers for only 100 milliseconds on overspeed;
the 14 volt supply can then be used with a series limiting resistor to power the
pneumatic trip.
Use a ¼ watt, 47–50 Ω resistor in series with the 14 volt supply.
Switching 28 Vdc
When switching 28 Vdc into the coil, use a 5–10 watt, 180 Ω resistor in series
with the SPV-200 coil.
17
Powering External Devices
Fig. 3-6 Switching the
regulated 14 Vdc
supply.
Fig. 3-7 Switching the
28 Vdc supply.
Use a current limiting resistor in series with the dc power
source and the transferring relay contacts.
WARNING: TO AVOID SPV-200 COIL DAMAGE