Oeu Termination Strip Test - ABB XSeries G4 6200 User Manual

5.4.12 RS-485 OEU termination strip test
5.4.12.1
1) Using an oscilloscope, if available, measure the line driver voltage on the
2) Using an oscilloscope, measure the request to send voltage on the G4 EX
3) Using an oscilloscope, measure the transmitting data voltage on the G4 EX
4) Repeat steps 1 through 3 on the transceiver side of the termination strip.
5) If any inaccuracy exists, investigate the wiring errors.
Page 5–22
If a communication problem still exists and the unit has
passed the required test, additional testing is required.
Step-by-step instructions
Voltage on the following steps may be difficult to see using a
Digital Multi-meter. If available, an oscilloscope will provide
a more accurate reading. To verify, the WinCCU software
must continuously be polling the meter.
Generally speaking, these tests
termination strip will only verify incorrect or damaged wiring.
If all previous testing passed and all wiring, jumper and
terminations have been verified correct, the termination strip
may need to be replaced but does not typically fail. Contact
Totalflow Customer Service. See the Getting Help section for
instructions.
When designating the wire colors in the following
procedures, color/origination complies with Totalflow wiring
instruction drawings. For the purposes of these instructions,
the user may need to adapt for their individual installation.
G4 EX side of the OEU termination strip (see Figure 5–8) between:
When the unit is receiving data from WinCCU, the voltage should vary
between +5 VDC and 0 VDC. This indicates that the unit is receiving data.
side of the OEU termination strip between:
When the data in the G4 EX is sending communication data to WinCCU, the
voltage should be +5 VDC for the duration of the transmission.
side of the OEU termination strip between:
When data is being transmitted from the G4 EX unit, the voltage should vary
between +2 VDC and +5 VDC.
BUS+ and BUS-
GND and RRTS
GND and BUS-
And
GND and Bus+
performed on the
2104349 rev. AD