Deutz EMR 2, Описание системы, Страница: 17 / 60

© 06/02
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EMR 2
System Functions
4.3.1 Switchable speed functions
The conditions for the switchable variants are selected by means of a switch (Input pin 18, GND pin 17
V plug). The switch closes a contact to -U
Batt
.
The following is applicable for the switchable speed functions:
The switching condition can be displayed with the aid of the SERDIA diagnostic software (see Chapter 7.3)
4.3.2 Second speed input (optional)
This input can be used as a redundant speed input. If a second speed sensor has been installed, then the
engine will not be switched off on failure of the first speed sensor but will switch over to the second one.
The failure of a speed sensor is indicated by the continuous burning of the fault lamp. The operation of the
engine can be limited by defining a lower desired speed (see also Chapter 7.1).
4.3.3 Excess speed protection
when the speed limit is exceeded, the EMR 2 moves the control rod into the Stop position. The output,
engine switch off (Digital 3, M 2) is activated (if it is programmed) and a fault message is generated.
With applications in mobile machines the thrust mode is programmed as a safety measure.
Exceeding of the revolution limit can occur in thrust mode. In this case the control rod is moved to the zero
position and the fault lamp lights up. The engine is protected against excess revolutions also in this type of
operation.
After falling below the programmed recovery limit, the governing is again taken up and the fault lamp is
extinguished. The parameters “Above speed limit” and “Recovery limit” are adjustable.
Switchable speed functions
(for a selectable)
Switch open
1)
(1/HIGH)
1) With an open switch, the underlined conditions above are activated as preset values (default values).
Switch closed
(0/LOW)
Speed 1/ speed 2 Speed 1 Speed 2
Fixed / variable speed Variable Fixed
Speed variable / freeze Variable Freeze
Variable speed governor / Min/Max
governor Variable speed governor Min/Max regulator