Relay Modules - ABB SM3000 User Manual

SM3000
Multipoint Videographic Recorder

6.7.2 Relay Modules

102
Offset adjust / Span adjust
Manually fine-tune the offset adjust and span adjust values to
remove process errors. These are calculated values applied to
the raw input signal.
Note. If simulating thermocouple inputs, connect the millivolt
source using appropriate
Section 7.4.2, page 114. For 2-lead resistance thermometers,
either connect the resistance box at the sensor end of the leads
or add the lead resistance to the calibration values.
Engineering
High
Adjusted
Value
Engineering
Low
Unadjusted Value
Engineering Engineering
Low High
Without Adjustment
(Span Adjust = 1, Offset Adjust = 0)
Select the relay source (a digital source) to be used to
energize/de-energize the relay.
Note. If the relay is used to provide a totalizer count pulse, the
maximum pulse frequency is 5 Hz. Consideration must also be
given to the mechanical life of the relay.
Select the relay source polarity.
Note. When polarity is set to 'Positive', the relay is energized
when the digital source is active (On).
6 Configuration
compensating cable – see
Engineering
High
Adjusted
Value
Span Adjust (<1)
Offset Adjust (>0)
Engineering
Low
Unadjusted Value
Engineering Engineering
Low High
With Adjustment
(typical example)
IM/SM3000–EN Rev. L