REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
45 / 80
Table 12:
All available commands on the factory test mode
Command
Description
s
set time to RTC
a
set A/D calibration parameter
p
display A/D calibration parameter
w
test DSP watchdog
f
test fast I/O and DSP trip interrupt
g
GPS IRIG-B test
b
test binary I/O board
k
enter DSP calibration mode
r
read communication board version
u
show DSP RAM test result
h
show help (e.g. the present table)
As can be seen from the table the calibration mode can be entered by selecting the
command k. In this mode the offset errors of the signal conditioning chain for the fur-
ther processing of the analog input signals in the REF542
plus
unit can be compen-
sated. Moreover the connections to the connector X80 can be defined. Afterwards the
calibration data are stored on the EEPROM on the Analog Input Board.
The calibration procedure needs the following preparation:
Sinusoidal generator as already mentioned in chapter 6.2.1.
Put in the jumper X12, which is located near to the back plane connector.
6.3.3.1 Transformer Input Board
The board must be supplied at X80 connector with:
1A, 50 Hz with accuracy class 0.5 at the 1A current inputs pins
0,2A, 50 Hz with accuracy class 0.5 at the 0,2A current inputs pins, normally on
input channel 7 and/or 8
100 V RMS, 50 Hz. with accuracy class 0.5 at the voltage inputs
Note
During the calibration procedure all signals used calibration must be in phase!
6.3.3.2 Sensor Input Board
The board must be supplied at the X81…X88 connectors at the same time with sig-
nals of 2V, 50 Hz with an accuracy class 0.5
Note
During the calibration procedure all signals used calibration must be in phase!
