JLG 800A_AJ Service Manual - Manual (Page 172)

SECTION 3 - CHASSIS & TURNTABLE
3-116 – JLG Lift – 3120858
3.28 DEUTZ EMR 2 (S/N 85331 TO PRESENT)
The EMR2 consists of the sensors, the control unit and the
actuator. Engine-side controls as well as the JLG Control
System are connected by means of separate cable har-
nesses to the EMR control unit.
The sensors attached to the engine provide the electron-
ics in the control unit with all the relevant physical parame-
ters In accordance with the information of the current
condition of the engine and the preconditions (throttle
position etc.), the EMR2 controls an actuator that operates
the control rod of the injection pump and thus doses the
fuel quantity in accordance with the performance require-
ments.
The exact position of the regulating rod is reported back
and, if necessary, is corrected, by means of the control
rod travel sensor, situated together with the rotation mag-
nets in a housing of the actuator.
The EMR2 is equipped with safety devices and measures
in the hardware and software in order to ensure emer-
gency running (Limp home) functions.
In order to switch the engine off, the EMR2 is switched in a
de-energized fashion over the ignition switch. A strong
spring in the actuator presses the control rod in the de-
energized condition into the zero position. As a redun-
dancy measure, an additional solenoid serves for switch-
ing off and this, independently of the actuator, also moves
the control rod in the de-energized condition into the zero
position.
After the programming, that is carried out over the
ISO9141 interface, the EMR2 possesses a motor-specific
data set and this is then fixedly assigned to the engine.
Included in this are the various application cases as well
as the customer’s wishes regarding a particular scope of
function.
Each EMR2 module is matched by serial number to the
engine. Modules cannot be swapped between engines.