Remove Field Wiring; Figure 58: Removing The Electronics Enclosure Cover - ABB LevelMaster 7100 User Manual

2. Remove the cover from the electronics enclosure: rotate it in a counter-clockwise direction to unscrew it from the base. The
electronics board is exposed when the cover is removed (Figure 58).
3. Place the cover in a safe place.

Remove field wiring

The removal of field wiring is required for service. Field wiring may include connection to additional LevelMasters, barrier
boards, power supplies, or remote controllers or flow computers.
IMPORTANT NOTE: Ensure that power connected to the LevelMaster is disconnected before removing field
wiring.
Depending on the type of board, there may be one or two connectors for power and communications.
To remove field wiring:
1. Remove the power to the unit and the cover as described in section 8.1, Remove the enclosure cover.
2. Hold the board by the edges, and pull it slowly out.
3. Use the small slotted screwdriver to remove the power and communication connectors attached to the electronics board.
a. When removing wiring from older boards (2018546-005), there may be one or two connectors.
b. When removing wiring from newer boards (2104836-001), there are always two connectors, one for each: power and
communications.
4. Identify which wires connect to each connector pin. If not color-coded, wires may be labeled or marked for easy
identification.
a. Identify or label the two wires used for power (+V, -V).
b. Identify or label the wire pairs used for communication:
i. For 2018546-005 boards, identify +T, -T, +R, -R.
ii. For 2104836-001 boards, identify +T, +T, -T, -T.
5. If removing the unit from the tank:
a. Remove connectors from wires to be able to pull the conduit off of the enclosure (connectors can not fit through the
conduit holes). Use the small slotted screwdriver to losen and remove the wires from each contact. Keep connectors
in a safe place. They will be needed when wiring is restored after part replacement.
b. Remove the cable or conduit from the base of the electronics enclosure. The removed wires will hang at the end of
the conduit.
c. Position the conduit safely until ready to install back into the enclosure and restore wiring.
LevelMaster 7100 User manual 2105835 Rev AA | 66

Figure 58: Removing the electronics enclosure cover