26
Electrical System Interface
Power Requirements and Recommendations
Note:
Italicized
requirements are critical to reliable vehicle operation.
Battery Power Requirements and Recommendations
•
The vehicle shall have a negative ground power system.
•
The vehicle primary power system shall be either of the following types: 12 or 24 volt.
•
The vehicle power system shall be designed such that if both the TCM and the ECA lose power due to a single point
disconnect, the same disconnect simultaneously removes power from the ECM.
•
The ECU battery power terminations shall not be made on the battery, frame rail, or starter posts. This applies to
Battery Positive and Battery Negative.
*
•
The ECA battery power terminations shall not be made on the battery, frame rail, or starter posts. This applies to
Battery Positive and Battery Negative.
*
•
If a disconnect switch is used for the ECM, it shall be configured such that it also removes power to the TCM and
ECA simultaneously.
•
For full TCM sub-system operation, the vehicle power system shall provide minimum of 9.0 volts DC at a steady state
load of 30 amps for a nominal 12 volt vehicle power system (18.0 volts DC at a steady state load of 30 amps for a
nominal 24 VDC system) at the ECU connector.
•
For full TCM sub-system operation, the vehicle shall provide an electrical system, that, at 120 °C, the conductors
between the TCM and the vehicle primary power system shall have no more than 0.05 ohms between TCM and
Battery Positive and no more than 0.05 ohms between TCM and Battery Negative (0.1 ohms total).
•
For full ECA sub-system operation, the vehicle shall provide minimum of 9.0 volts DC at a steady state load of 30 amps
for a nominal 12 volt vehicle power system (18.0 volts DC at a steady state load of 30 amps for a nominal 24 VDC
system) at the ECA connector.
•
For ECA optimal shift quality, the vehicle shall provide a minimum of 11.0 volts DC at steady state load of 30 amps at
the ECA connector.
•
For full ECA subsystem operation, the vehicle power system shall provide and electrical system, that, at 120 °C, the
conductors between the ECA and the vehicle primary power system shall have no more than 0.040 ohms between
ECA and Battery Positive and no more than 0.040 ohms between ECA and Battery Negative (0.080 ohms total) to
vehicle battery.
•
The electrical power supply shall not exceed crank profile defined in ISO 16750-2 Third Edition (March 15, 2010)
section 4.6.2.3 during crank for full transmission system operation.Contact your Eaton OEM Engineering Support
Group for additional information.
-
The ECA function will not be affected if the crank profile is exceeded.
-
The TCM has been designed to allow cranking to continue for limited excursion outside of crank profile. Other
TCM functions may not function when the crank profile is exceeded.
•
The OEM shall supply power to the TCM and ECA that does not exceed a steady state voltage of 32 volts DC.
•
The OEM shall provide Switched Ignition power signal such that the differential voltage (TCM Negative subtracted
from Switched Ignition) shall exceed 9.0 volts DC at a steady state load of 10 amps.
•
Vehicle Power and Switched Ignition to the TCM shall not be switched off during the engine start process.
•
Frame Rail shall not be used as a return path for Battery Negative Vehicle Power.
•
Vehicle Power shall be configured as shown in one of the accepted power electrical architectures indicated below.
*
*
Additional options may be available with approval from your Eaton OEM Engineering Support Group.
Summary of Contents for UltraShift PLUS EO-11E406B-PV
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