Testing - ABB REC 561 User Manual

1MRK 580 154-XEN
Page 7 - 12

7 Testing

Direct current measuring unit
IDeadB
is a set value of the current level for IDBS in mA
SampRate
is a set value of sampling rate (frequency) in Hz
1
ts = --------------------------
SampRate
Users can change the polarity of connected direct current input signal by
setting the ChSign to On or Off. This way, users can compensate by set-
ting for the wrong connection of the direct current leeds between the
measuring converter and the input terminals of the 500 series unit.
The setting table lists all setting parameters with additional explanation.
You need stabilized current generator and mA meter with very high accu-
racy for measurement of direct current to test the measuring module. The
generator operating range and the measuring range of the mA meter must
be between -20 and 20 mA.
Connect the current generator and mA meter to the corresponding direct
current input terminals. Check that the values presented on the MMI mod-
ule corresponds to the magnitude of input direct current within the limits
of declared accuracy. The service value is available under the submenu:
Service Report
Slotnm-MIMx
MIxy-Value
where:
nm represents the serial number of a slot with tested mA input module
x represents the serial number of a mA input module in a terminal
y represents the serial number of a measuring channel on module x.
The operation of ADBS or IDBS function can be checked separately with
the setting of RepInt = 0. The value on the MMI must change only when
the changes in input current (compared to the present value) are higher
than the set value for both dead bands.
Configure the monitoring output signals (see the signal list) to the corre-
sponding output relays. Check the operating monitoring levels by chang-
ing the magnitude of input current and observing the operation of the
corresponding output relays.
time between two samples in s
ABB Network Partner AB
Version 1.0-00