User manual

Chapter 2 Module Description
2-9
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Error Messages
There are three types of faults that a 1700 module will recognize.
hý
Transducer Fault (Error 1) –
A problem exists on a transducer channel.
hý
nvRAM Fault (Error 2) –
A problem exists with the non-volatile RAM or
parameter values are not stored correctly.
hý
Reference Voltage Fault –
The reference voltage constants could not be automati-
cally restored while clearing a nvRAM error.
In all cases, the red FAULT LED will be on and the module will display an error message as
shown below. These errors are also reported over the backplane. See Chapter 7 Data Format,
for information on how errors are reported over the backplane.
Transducer Fault (Error 1)
This message is only shown when the module is displaying position or
tachometer data. The parameters are displayed normally. If the FAULT
LED is on while the position is displayed, the fault is on one of the other
channels. Use the >NEXT@ key to switch to the faulted channel. The fault
can be cleared by pressing the >CLEAR@ key if the 'Err1' message is
blinking. There are six major causes of a transducer fault.
hýBroken or intermittent transducer cable
hýNon-compatible transducer
hýImproper wiring of the transducer cable
hýImproper installation of the transducer cable
hýFaulty transducer
hýFaulty module
nvRAM Fault (Error 2)
All of the parameters are stored in a non-volatile static RAM memory when power is re-
moved from the module. The nvRAM has an integral lithium battery that will maintain the
parameter values in the absence of power for approximately ten years from the date of
manufacture.
It is remotely possible that the values can become corrupted through electrical noise or an
inopportune power outage. If this occurs, the module display will change to figure 2.19.
This message is displayed at all times. This error can be cleared by
pressing the >CLEAR@ key. If the message remains after pressing the
>CLEAR@ key, the nvRAM is damaged. If the message appears on every
power up but can be cleared, the battery is discharged. In either case,
the module must be returned to AMCI for repairs. See the inside front
cover, Returns Policy, for additional information.
A 1700 module stores constants in the nvRAM that allow it to adjust the
reference voltage for either AMCI or Autotech transducers. If these
constants are corrupted, the module will recalculate them as long a
working transducer is attached. While calculating the constants, the
display will show “rEF_nn” where nn = 00 to 99. Once recalculated, the
display will change to the position display. If these constants cannot be
calculated, the display changes to the reference voltage fault display.
PLC SERIES
Figure 2.18
Transducer Fault
PLC SERIES
Figure 2.19 nvRAM
Error