![North Atlantic 75DS2 Скачать руководство пользователя страница 14](http://html.mh-extra.com/html/north-atlantic/75ds2/75ds2_operation-manual_1707616014.webp)
D/S One/Two Channel (Modules 1*, 2*, 3*, 4*)
75DS2 Operations Manual
North Atlantic Industries, Inc.
11/11/2011
Rev: 2011-11-11-1000
www.naii.com
Page 14 of 43
D/S Set Reference Voltage
Utilized for setting input/output transformation ratio. Set the expect
ed input reference voltage “V
REF
” to a
corresponding register. The input voltage is set with a resolution of 10 mv rms. The setting is in integer decimal
format.
For
example
, if channel 1 expected input REF voltage is 26.0 V
RMS
, the set word to the corresponding
register would be 2600.
D/S Set Signal Voltage
Utilized for setting input/output transformation ratio.
Set required output signal voltage “V
L-L
” to a corresponding
register. The output voltage is set with a resolution of 10 mv rms. The setting is in integer decimal format.
For
example
, if channel 1 Signal (VL-L) voltage is to be 11.8 V
RMS
, the set word to the corresponding register would
be 1180.
D/S BIT Test Enable
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
BIT Test Enable
X
X
X
X
X
X
X
X
X
X
X
X
D3
D2
X
X
Set bit to enable associated Built-In Self Test D2 or D3.
The on-line (D2) Test
-
Writing “1” to the D2 bit of the D/S Test Enable Register initiates status reporting of the
automatic background BIT testing that checks the output accuracy of each channel by comparing the measured
output angle to the commanded angle. The status bits will be set to indicate an accuracy (0.2º) problem and the
results can be read from
D/S Status
registers
within 2 seconds and if enabled, an interrupt will be generated (See
Interrupt Register). Writing a “0” deactivates the status reporting. The testing is totally transparent to the user,
requires no external programming, and has no effect on the standard operation of this card.
Note: Outputs must
be ON and Reference supplied for test to function.
Card will write 55h (every 0.1 seconds) to the
D/S Test
(D2) Verify
register when D2 is enabled. User can periodically clear to 00h and then read the
D/S Test (D2)
Verify
register again, after 0.1 seconds, to verify that BIT Testing is activated. This test continuously sequences
between the channels on the card with each output being measured for approximately 180mSec. If the measured
angle has an error greater the 0.2º, a flag will be set in the appropriate register. If the input angle is stepped more
then 0.2º during a test cycle, the test cycle will not generally indicate an error. In addition, each D/S Reference
input and signal output is continually monitored. Any failure triggers an Interrupt (if enabled) and the results are
available in the
D/S Signal
and
D/S Reference Status
registers
.
The off-line (D3) Test
-
Writing “1” to the D3 bit of the D/S Test Enable Register initiates a BIT Test that
generates and tests 24 different angles to an accuracy of 0.2
. External reference is required and outputs must be
ON. The D/S Status bits will be set to indicate an accuracy problem. Results are available in the
D/S Test Status
registers and if enabled, an interrupt will be generated (See
Vector Interrupt
Registers). Test cycle takes about 30
seconds and the D3 bit changes from “1” to “0” when test is complete. The testing requires no external
programming, and can be terminated at any time by writing a “0” to the D3 bit of the
D/S BIT Test Enable
register.
CAUTION:
Outputs must be ON and Reference must be supplied during this test. The outputs are
therefore active. Check connected loads for possible interaction.