REF 542plus switchbay protection and control unit
Manual Part 3: Installation and Commissioning
1VTA100004-en DMS,2001-10-04
REF542
plus
: Installation and Commissioning
46 / 80
6.3.3.3 Mixed Input Board
In this case the board must be supplied at
X80 current inputs with 1A, 50 Hz with accuracy class 0.5
X80 voltage inputs with 100V, 50 Hz. with accuracy class 0.5
X81..X86 with 2 V, 50 Hz accuracy class 0.5
Note
During the calibration procedure all signals used calibration must be in phase!
6.3.3.4 Calibration procedure
Before starting the calibration procedure, the protection unit housing must be
grounded. Beside that, the shielding screw on the analog input board must also be in.
Caution
Before starting the calibration procedure, the jumper X12 must be put in
After switching on all the input signals for running the calibration procedure can be
started. For each possible analog input channel (from 1 to 8) the following selection
must be done:
c
, if the input is a current transformer (1A).
v
, if the input is a voltage transformer (100V).
s
, if the input is a sensor (2V)
x
, if you like to skip the calibration for the channel.
After entered 8
th
channel input settings the calibration procedure starts automatically
the calculation of calibration factors and after some seconds, it ends. The report
shows at the corresponding input lines the calibration result with channel accuracy. In
case of wrong connections to the input a phase error will be reported. The following
figure shows the returned messages of the calibration procedure in case of phase er-
ror.
