Direct current measuring unit
ABB Network Partner AB
1MRK 580 154-XEN
Page 7 - 11
Version 1.0-00
The complete measuring module is equipped with advanced self-supervi-
sion. Only the outermost analogue circuits cannot be monitored. The A/D
converter, optocouplers, digital circuitry, and DC/DC converters, are all
supervised on the module. Over the CAN bus, the measuring module
sends a message to the MPM for any detected errors on the supervised cir-
cuitry.
6 Setting
You must use the SMS and the CAP 531 configuration tool to set all
remaining parameters that are related to different alternating measuring
quantities.
Users can set the 13 character name for each measuring channel.
Set all monitoring operating values and the hysteresis directly in the mA
of the measured input currents from the measuring transducers.
You can display local and remote measured quantities according to the
corresponding modules that are separately set for each measuring channel
by the users (five characters).
The relation between the measured quantity in power system and the set-
ting range of the direct current measuring channel corresponds to this
equation:
Where:
is a set value for the minimum operating current of a channel in
mA
is a set value for a maximum operating current of a channel in
mA
is a value of a primary measuring quantity corresponding
to the set value of minimum operating current of a channel
is a value of a primary measuring quantity corresponding
to the set value of maximum operating current of a channel
.......is the actual value of the primary measured quantity
Set the dead-band limits directly in the mA of the input direct current for:
• Amplitude dead-band supervision
• Integrating dead-band supervision
You must observe the dependency of the [mAs] on the sampling
frequency, which corresponds to this equation:
where:
Value ValueMin I IMin–()
ValueMax ValueMin–
IMax IMin–
-----------------------------------------------------------
⋅+=
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