Power Tech Generators PTS-25 Operator's Manual page 51

The ES52F Engine Controller is designed to enable automatic Start/Stop capability as well as providing
fault protection for the generator. The ES52F will automatically Start the generator upon command and
will monitor vital engine and generator functions. In the event a failure was to occur, the ES52F will
automatically Stop the engine thus preventing further problems.
CAUTION: To prevent automatic or accidental Starting or short circuit, disconnect the 12V DC power
source before performing any maintenance or repairs. Turn OFF the Master Disconnect Switch or
disconnect the 12V DC power at the battery.
SPECIFICATIONS:
3.3V DC to 30V DC Operating Limits.
12mA Standby Current Draw.
175mA Operating Current Draw.
Internally Protected against Reverse Polarity.
Speed Sensing accepts Generator AC Output.
Speed Sensing rated to a Maximum of 300V AC.
-40°C to +85°C Operating Temperature.
LED Indication
No LEDs ON
Low Oil, steady
Low Oil, flashing
High Temperature, steady Over Temperature Failure
Over-Crank, steady
Engine Running, steady
Engine Running, flashing
Preheat On, steady
"LED" INDICATORS
ES52F ENGINE CONTROLLER
ES52F "LED" INDICATIONS
"Ready" unit waiting for start signal,+12/24V DC to Auto terminal.
"Off", no +12/24V DC to Auto terminal.
Low Oil Pressure Failure
Auxiliary Input Failure
Engine would not start after specified Crank tries.
Engine Controller is in running mode of operation.
Crank-rest period. Cranking will resume soon.
Glow Plug timer feature – With jumper in place, preheat is set for
8 seconds. With jumper removed or cut, preheat is set for 16 seconds.
Condition / Failure
16