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TROUBLESHOOTING
This section describes the test modes available for evaluating the performance of the Model
25 Encoder.
POWER-ON SELF-TEST
By design, the Model 25 is software-intensive in order to minimize the number of
components that may fail. The built-in self-test, which is automatically run when the encoder
is powered-on, checks the displays, internal digital circuitry (microprocessor and memories),
and displays the results on the front panel using the encoder status display and the Instant
Call LEDs. As the test is taking place, the status display will show a single rotating LED
segment and then the number of the test being run. The Instant Call panels will illuminate
their LEDs first by the column then by the row while the test is taking place. By exercising
the displays, the encoder allows the operator to verify the LEDs.
If a test reveals a fault in the encoder or Instant Call panel, then the encoder will halt the test
and begin to beep and flash the word “
Errx
” (“
x
” is the error number). If the fault is found
on an Instant Call panel, then the faulty panel will have some of the LEDs in its right hand
column on, one of which will be the
CLEAR
key’s LED. In most error cases, the encoder will
not operate until the fault is repaired. In the case of a loop fault or Instant Call fault (
Err0
),
the encoder may be operated from the keypad after the
RESET
key has been pressed.
However, the Instant Call panels will be disabled until the power is removed and fault
repaired. The instant call panels may be enabled again by using the “port enable” feature
(described in the Installation Section) instead of removing power. The possible error numbers
and their probable causes are shown in Table 16.
Summary of Contents for Model 25
Page 1: ...Model 25 Programmable Encoder Product Manual 025 9567E...
Page 2: ......
Page 16: ...Specifications 8 025 9567E...
Page 36: ...Operation 28 025 9567E RELAY TIMING DIAGRAM...
Page 62: ...Auxiliary Panel Installation 54 025 9567E...
Page 72: ...Troubleshooting 64 025 9567E...