Keystart 9620 series control modules provide manual start/stop and
automatic fault protection for generators, pumps and other engine-driven
Operator control is by a 3 position keyswitch, with the key removable
only in the Stop/Reset (O) position. Outputs are provided for the
control of engine fuel (energised to run), starter motor and preheat.
The Keystart also has an alarm output for remote/audible warning of
Indication of engine status and faults is by six LEDs and pictograms.
Four switch inputs (closing to negative on fault) provide for automatic
shutdown on engine low oil pressure, high coolant temperature and
auxiliary faults. Model 9621 has a fully adjustable engine overspeed
shutdown feature, configurable for either generator AC or magnetic
pickup speed signals. Charge alternator excitation and a charge fail
warning LED are fitted as standard.
Electrical connection is by quick-connect, spring-clamp terminal
blocks. A universal 7 to 30VDC power supply allows operation with 12 or
24VDC engine batteries, with engine crank-dip voltage protection fitted
Keystarts are front-of-panel mounted through a standard square
cut-out, and secured at the rear with quick-fit clips. Epoxy-resin case
encapsulation gives superior vibration/ shock resistance and
- Steady State: 7 30 VDC
- Brown out/cranking: 5 VDC
- Current consumption: < 100mA
Fault switch inputs: close to negative DC during fault
ve input defined as: 1V to +1V w.r.t. ve DC supply
Speed sensing inputs (model 9621 only):
- generator AC:70 270 VAC rms, <50 to >60 Hz. nominal
- magnetic pickup: 3.5 21 VAC rms, <2000 to >6500 Hz. nominal
(all ratings non-reactive)
Run (fuel), preheat: positive DC, NO relay contacts, 10 A max. @ 24 V DC
Start (crank): positive DC via keyswitch contacts, 10 A max. @ 24V DC
Alarm: negative DC (open collector NPN transistor), 250mA max.
Speed calibration: to suit 0 1 mA, 75 Ohm meter, output = 0.75mA at rated engine speed
Preheat timer: 0 or 10 secs (links J1 & J4), default = 0 secs
Fault Override Timer: 2 to 20 secs (VR1), default = 10 secs
Overspeed Trip Level: 100 to 130 % (VR3) of nominal speed calibration (VR2),
default = 110% (of 50 or 60 Hz)
Overall dimensions (w x h x d): 96 x 96 x 95 mm / 3.8 x 3.8 x 3.7 in.
Panel cut-out size: DIN 92 x 92 mm / 3.6 x 3.6 in.
Weight: approx. 300 g / 0.7 lb
Operating Temperature: 35°C to +55°C / 31°F to 131°F