Wiring Additional Levelmasters - ABB LevelMaster 7100 User Manual

CAUTION - Equipment damage. The output voltage (VOUT) at the serial (COM) ports on an ABB Totalflow flow
computer or remote controller is dependent upon the external power supply connected to these devices.
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 host controllers 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.
To wire for power:
CAUTION - Equipment damage. Do not connect any cable shields or drain wires to the POWER connector (-)
terminal. The drain wire or cable shields should be connected to the Earth Ground terminal of the safety barrier or
the host controller (See Figure 33, Wiring the LevelMaster to the barrier board).
1. Remove the 2-position terminal connector from the POWER port.
2. Loosen the screws on the power connector.
3. Insert the wires in the power connector, observing correct polarity. If wires are color-coded, take note of the color used for
each pin. If not color-coded, label or keep track of the wire positions to ensure that they will be connected to the correct
pins on the other end of the wire.
a. If the unit is the only unit, insert the wires run from the host controller or alternate power source in the (+, -) positions.
Secure the inserted wires by tightening the screws on the connector.
b. If the unit is an intermediate unit on the bus (additional units will be connected):
i. Insert the wires for power, run from the host controller or alternate power source, in the (+, -) positions and
leave screws loose to insert the wires from an additional LevelMaster.
ii. Insert the wires for power, run from the additional LevelMaster, in the (+, -) positions. Secure wires by tightening
the position screw. See section 4.4, Wiring additional LevelMasters.
4. If installing only one unit, proceed to terminate the wires at the host controller end.
a. For non-hazardous locations, proceed to section 4.5.1, General purpose locations.
b. For hazardous locations, proceed to section 4.5.2, Hazardous location.
5. If installing additional units, proceed to section 4.4, Wiring additional LevelMasters.
6. Insert the power connector back into the board.
7. 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.

Wiring additional LevelMasters

Multiple LevelMasters can be interconnected (daisy-chained) on an RS-485 bus configuration (Figure 23) when measuring
levels at a site with multiple tanks. Use this procedure to wire the remaining units on the bus.
IMPORTANT NOTES: This procedure assumes that all LevelMasters in a bus are powered from the same source
which is wired to the first unit on the bus.
LevelMaster RS-485 termination must be configured correctly based on the position of the unit on the bus.
For legacy boards (part number 2018546-005), terminate as described in section 4.1.3, Onboard termination
jumpers (legacy boards only).
LevelMaster 7100 User manual 2105835 Rev AA | 26