ZF CruiseCommand 785CE, Installation And Troubleshooting Manual

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TROUBLESHOOTING TRAIN-156 Rev.B 11/01
Page 15
B) In either case, follow the procedure listed under Diagnostic Menu
(Section 1.4) until the Applied Battery Voltage is displayed. Take
note of the applied voltage.
C) Go to the battery or Main Distribution Panel which is feeding
power to the Processor. With a DC Voltmeter, measure the voltage
at this power source. The battery voltage should be greater than
12.4 Volts in 12 VDC systems and 24.8 Volts in 24 VDC systems.
If not, the battery or it’s charging system needs servicing.
D) The voltage differential between the power source and the Proces-
sor should not exceed 1.2 Volts in 12 VDC systems and 2.4 Volts in
24 VDC systems. If so, there is high resistance somewhere
between the battery and Processor.
E) The high resistance, resulting in a differential voltage of 1.2 Volts
(12 VDC Systems) or 2.4 Volts (24 VDC Systems) or greater, may
be the result of corroded or tarnished connections, dirty or pitted
relay contacts or an improperly sized power cable.
F) If the voltage differential is less than 1.2 Volts (12 VDC Systems)
or 2.4 Volts (24 VDC Systems), which is what you would typically
expect, a loose connection may exist between the power source and
the Processor. The vibration experienced while the vessel is under-
way may intermittently cause the circuit to open. Check all the
connections between the power source and the Processor for a loose
bolts, nuts, etc.
1.5.2 One Long - Three Short
This tone indicates that there is an invalid command signal at the Sta-
tion-in-Command. The Processor expects a DC voltage, representative
of the Control Head’s lever position, between approximately 0.5 and
4.40 VDC. This DC voltage is then interpreted as an A/D Count by the
Processor. More on A/D Counts later. If the voltage drops below or
exceeds this range, the tone will be generated. At the same time the
throttle command will drop to Idle and the clutch will be commanded to
Neutral. The cause of the fault may be due to:
NOTE: If an APS is being utilized in the power circuit, take into account the 0.7 VDC forward
voltage drop of the diodes, which would increase the permissible differential to 1.9 or 3.1
VDC depending on whether the system is 12 or 24 VDC.