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CAUTION – Equipment damage. The LevelMaster can be powered
from the serial (COM) ports on an ABB Totalflow flow computer or
remote controller. The output voltage at these ports is dependent upon
the external power supply connected to the device.
Before connecting the LevelMaster to these ports, ensure that the flow
computer or remote controller input voltage does not exceed 15 Vdc.
Connecting the LevelMaster to devices with an input power larger than
15 Vdc (for example devices powered by 24 Vdc voltage sources) will
result in damage to the LevelMaster because the output power from the
serial port (VOUT) will also be larger than 15 Vdc. Use an independent
power source if unable to power the unit from the flow computer or
controller.
3.
Insert the wires in the power connector observing correct polarity (Figure 14).
a.
Connect to flow computer/remote controller COM port if VOUT is 12 Vdc.
b.
Connect to alternate power source if VOUT at the COM port is greater than
12 Vdc.
4.
Insert the power connector back into the board.
5.
Verify that the power LED (labeled D9 and located below the power connector)
is not lit. If it is lit, it indicates that the wrong polarity has been used and it must
be rewired to correct polarity.
4.9.2 Wiring for communication
To wire for communication:
1.
Loosen the screws on the communication connector (4-position terminal
connector).
2.
Insert the wires in the connector observing the pinout.
a.
If the unit is the only unit connected to a flow computer or remote controller
wire as shown in Figure 15.
20 | 2105824-001 rev. AA
Figure 14: Wiring for power
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