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PowerTech PT20-EC Manual

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Operating Behavior
Starting
The generator starts in response to the “START” button being depressed for 1 second. The PCM
goes into the Pre-Heat State, followed by the Cranking State, then finally, the Running State. The
PCM attempts to start the generator a specific number of times (configuration parameter) before
declaring a Fault. The shutdown inputs are checked before the start is attempted. If any of these
inputs are active, the start process is aborted.
See the following sections for more detailed information about each state.
Stopping
The generator stops in response to the “START” button being depressed for 1 second. All relays
are returned to their reset condition (OFF). Inputs to the PCM are not actively monitored, except
the Start/Stop Button. The LED is turned off. The PCM enters the Idle State.
Power Cycle/Reset
If the power to the PCM is cycled, it will immediately shut down all relay outputs, stopping the
generator. The unit will start with all fault and status flags reset. There may be a pause of
several seconds before all the configuration information is processed and the unit is ready to
accept input.
Idle State
The Idle State is the initial state of the PCM after a Power Cycle/Reset. The PCM returns to this
state after a Stop Command. The LED is not lit.
Pre-Heat State
The Pre-Heat State is necessary to energize the Glow Plugs for the Cranking State. The Fuel
Pump is active. The duration of this state is determined by using the coolant temperature
according to the formula:
< 23 ºF cranking time = 15 seconds
23 ºF – 50 ºF cranking time = 8 seconds
> 50 ºF cranking time = 5 seconds
The LED blinks.
Cranking State
The Cranking State attempts to start the generator combustion. The starter and fuel pump are
active. Successful sustaining combustion is determined by measuring the AC Line 1 output
frequency. The LED blinks.
Running State
After an initial “ignore” time (configuration parameter), inputs are monitored for out-of-bounds
limits and, if needed, a shutdown command is issued. The LED is lit.
Fault State
The Fault State is entered if an input reaches an out-of-bounds limit. The generator is
immediately stopped. A Power Cycle/Reset is required to exit the Fault state. The LED blinks the
Fault Code(s) (see next section).
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