ZF CruiseCommand 785CE, Installation And Troubleshooting Manual

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TROUBLESHOOTING TRAIN-156 Rev.B 11/01
Page 14
1.5 A
UDIBLE
T
ONES
As mentioned previously, there are various tones emitted from the
Control Head if an error were to occur. These tones are as follows:
1.5.1 Slow Repetitive Tone
The Slow Repetitive Tone, also referred to as the “Initialization Tone” is
the tone you hear at all Remote Stations when power is initially applied
to the control system. When this tone is heard, you know for a fact that
the following are true:
• Power has just been applied to the system
• The Software Program is running normally
• The Processor is commanding the throttle to Idle
• The Processor is commanding the clutch to Neutral
This is a totally normal tone when power has first been applied to the
Processor and no Control Head has taken command. However, the tone
may also be an indication of a problem, if during normal operation the
engine’s throttle drops to Idle, followed by the clutch to Neutral, the
Control Head’s rRed LED goes out and a slow repetitive tone is heard at
all remote stations. This indicates that the voltage at the Processor has
momentarily dropped below 8 VDC
and then returned to a normal oper-
ational level. This could be due to:
• Loose battery power cable connection
• Under-charged or defective battery
• Voltage drop due to current flow
In order to pinpoint the exact cause of the low voltage at the Processor,
perform the following checks:
A) Check the Display on the Processor for Error Messages. Error
Message 55 may appear indicating Under Voltage. One or more of
Error Messages 37 through 53 may also be displayed. This is due
to the momentary loss of serial communication between the two
Processors. Take note that the Under Voltage error is not only
dependent on low voltage, it is also dependent on the duration of
the low voltage. The possibility exists that an error message would
not be displayed if the duration of the low voltage was short
enough. However, the other symptoms mentioned above still occur.