ABB REO 517, Applications Manual

Page: 377 / 440

367
Monitoring of DC analog measurements
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If a 0.1 mA variation in the monitored quantity for 10 minutes (600 s) is the event that
should cause the trigger of the IDBS monitoring (reporting of the value because of
IDBS threshold operation) and the sampling frequency (SampRate) of the monitored
quantity is 5 Hz, than the set value for IDBS (IDeadB) will be 300 mA:
(Equation 81)
(Equation 82)
The polarity of connected direct current input signal can be changed by setting the
ChSign to On or Off. This way it is possible to compensate by setting the possible
wrong connection of the direct current leads between the measuring converter and the
input terminals of the REx 5xx series unit.
The setting table lists all setting parameters with additional explanation.
where:
IDeadB is the set value of the current level for IDBS in mA.
SampRate is the sampling rate (frequency) set value, in Hz.
ts = 1/SampRate is the time between two samples in s.
IDBS 0.1 600
⋅
60 mA s
] [
= =
IDeadB IDBS SampRate
⋅
60 5
⋅
300 mA
] [
= = =
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