Magnetek DSD 412, Technical Manual

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STANDARD CONTROL/DISPLAY OPERATION
38
1) Use the ▲ and ▼ keys to select the
function number (between 600 and 799) to be
accessed. The two colored LEDs remain off
during this step. For example, if 600 is
selected, the SCDU display will be:
6 0 0
Both LED’s Off
2) Press the DATA/FCTN key to enter the
"Data" level for this function number. The
green LED is lit to indicate that actual data is
currently being viewed. If the data for function
604 is currently at 20.94 for example, the
SCDU display will change to:
2 0. 9 4
Green LED Lit
The SCDU’s display is updated immediately if
the value for the selected function changes.
NOTE
Values displayed with these function numbers
cannot be modified.
Error Reporting
The drive has two methods available to report
errors and faults. Each error condition may
utilize ONE OR BOTH OR NEITHER of the
reporting methods.
The most conventional method is called ‘fault
recording’. If this method is enabled for a
particular error, the red FAULT LED and a
unique fault code number will appear on the
SCDU at the moment when the error occurs.
Each occurrence of a fault is recorded in an
area in RAM called the Fault List. The Fault
List stores the 16 OLDEST faults and
stops
recording faults as soon as the 16th fault
occurs. This list is erased when the drive is
powered down or reset. Whether or not the
drive stops or continues to run is dependent
on the way the particular fault is implemented.
Most standard faults are set up so that the
drive will stop if a fault occurs. Faults stored
on the Fault List will appear when viewing
Function 0.
The second method for error handling is
called ‘error recording’. Error recording differs
from fault recording in three respects:
1. The error condition will not be shown on
the SCDU or the red Fault LED.
2. The error list stores the 16 most recent
errors and always overwrites the oldest
error with the newest error.
3. This list is maintained in battery-backed-
up RAM and is retained when the drive is
powered down or reset. Operation of the
drive is totally independent of whether
error recording is enabled or not.
4. The Errors List may be viewed at
function 800.
Function 801
Used to display or alter the Fault & Error
Disposition List. This list is consulted any
time an error condition occurs to determine
whether it should be reported as an error, a
fault, or both. The process for changing the
entry in the disposition list for a particular error
using the SCDU is as follows:
1) Use the ▲ and ▼ keys to select
function number # 801 from the function level.
The two colored LEDs remain off during this
step.
8 0 1
Both LED’s Off
2) Press the DATA/FCTN key to enter the
"Data" level for function #801. The green LED
will light and the error code last modified, with
function #801, will be in the SCDU display.
The SCDU displays error code #13 (illegal
instruction) initially: