Ingersoll-Rand THERMO KING E-200 Series, Installation Manual

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TK 61694-18-IM-EN
Increased Idle Speed Setup
IIm mp po orrtta an ntt:: The presented proposal does not cover all the diversity of vehicle manufacturer implementations. An
adaptation to each application will be required. A carefully revision of your vehicle documentation is
advised.
The IIS signal has been implemented as a low-side transistor - this means that, when the signal is active, the associated
pin XG3-H1 is internally grounded (conducting condition). Otherwise, the pin is in high-impedance condition (blocking
condition). Please refer to your unit schematic for further details.
Concept
• This function is beneficial to improve the refrigeration performance during long periods of vehicle running in idle
(eg. Traffic jam, urban distribution with high density of traffic lights, etc.)
• The alternator maximum capacity is obtained at maximum engine rpm. If the engine is running in idle, the
maximum power delivered is less than half of the rated maximum power.
• Some vehicles incorporate a digital or analog input that can used to increase the idle speed.
• The Gateway Controller (GC) has a digital output (IIS signal) that indicates that the refrigeration units demand is
higher than the alternator can provide.
• The IIIS signal can be then used to “tell” the vehicle ECU to increase the idle speed in order to increase the power
delivered.
• Check the vehicle documentation if the vehicle is equipped with such a feature and how to integrate into their
circuitry.
• The IIS signal goes active when the Gateway goes to POWER DERATING mode. This state can be identified by a
triangle oriented downwards.
• The IIS signal it is cleared when the Compressor Drive Module (CDM) becomes inactive. eg when the unit goes to
NULL mode.