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10 GE Zenith Controls
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ZTX Operation and Maintenance Manual (62
R-2000)
Oil Pressure Sensor Input
(Oil pressure contact to be normally open, held closed
by adequate oil pressure)
Approximately five seconds after emngine starter signal
is sent, if terminal X3 is open to ground or returns to
open state thereafter the generator Starter and Fuel/Run
outputs are opened and locked out. After cause is deter-
mined and corrective action is taken and verified by quali-
fied technician, controller can be reset via reset button.
Temperature Sensor Input
(Temperature sensor contact to be normally open,
closed by over-temperature condition)
Approximately five seconds after the engine starter signal
is sent, if terminal X1 is connected to ground Starter and
Fuel/Run outputs are opened and locked out. After
cause is determined and corrective action is taken and
verified by a qualified technician, the controller can be
reset via the reset button.
Fuel/Run Contact Output
This output is activated closed whenever the engine is
running. This will keep the fuel valve open as needed,
and will cut fuel supply during the above mentioned
lockouts or when the engine is no longer called to run.
Start Contact Output
This output is activated closed during cranking of the
engine. Output will deactivate once the controller senses
that the generator output has reached 33% of frequency
indicating engine has reached running
RPM.
Generator Battery Input
This input is required to support the controller’s operation.
Fuel/Run Contact Output
(28 Vdc @ 5 amps)
Input
Temperature
Sensor
(12 Vdc)
Generator Battery Input
(12 Vdc)
Controller
Engine
Controller
+
X5 X6
X9 X10
– + –
+–
Start Contact Output
(28 Vdc @ 5 amps)
Input
Oil Pressure
Sensor
(12 Vdc)
X1 X2 X3 X4
Engine Controller Accessory Board
(Optional)