Table 11: Troubleshooting An Existing Installation - ABB LevelMaster 7100 User Manual

IMPORTANT NOTE: In the following procedures, specific wiring information is called by the common name for a
component, followed by its jumper number (abbreviated J) and pin number (for example: V-BATT, J4-1.) If the
host hardware is a 6790 RTU, locate the correct pins on the RTU termination board. If the host hardware is an
XRC, replace the J4 jumper number with the correct pins on the J6 jumper.
Error condition Check
Host hardware not
Battery voltage
operating
Unit won't power Outbound voltage from host
up hardware
Inbound voltage at barrier
Outbound voltage at barrier
Inbound voltage at the
LevelMaster
Power received at the
LevelMaster
Host hardware
LCD returned to Software files
Totalflow display
Testing the sensor
Test the LevelMaster sensor using the following procedure.
DANGER - Serious damage to health/risk to life. When performing service, or using a laptop in a classified area,
ensure that explosive gasses are not present.
Equipment required:
Test box (2101403-001)
LevelMaster 7100 User manual 2105835 Rev AA | 84

Table 11: Troubleshooting an existing installation

Procedure
Verify that the battery pack voltage is at least 11.5 Vdc.
See the troubleshooting section of host hardware user manual.
Using a digital voltmeter, measure transceiver V-BATT power supply voltage
between the following host hardware board J4 connector terminals:
J4-1 (GND [BLK])
J4-2 (V-BATT)
Switched voltage should be greater than 11.5 Vdc.
See the troubleshooting section of host hardware user manual.
Using a digital voltmeter, measure power supply voltage incoming from the host
hardware on the RS-485 cable. At the barrier, voltage should be greater than 11.5
Vdc.
J1-2 (POWER -)
J1-1 (POWER +)
Negative voltage indicates damage to the RS-485 cable.
Using a digital voltmeter, measure power voltage outbound from the barrier to the
LevelMaster. At the barrier, voltage should be greater than 11.5 Vdc.
J1-2 (POWER -)
J1-1 (POWER +)
Negative voltage indicates damage to the barrier. If the voltage received at the
LevelMaster is greater than or less than the host voltage, the power side of the
barrier could be blown.
In older UL barriers, the ground may be fused and can show smaller or even
greater voltage than the LevelMaster is providing. This is due to a "floating ground."
The current (mA) in these cases will be near zero. Continuity can be checked to
trace a parted power wire problem. Be sure to trace the wiring for polarity before
supplying power.
Using a digital voltmeter, measure voltage incoming from host hardware on the
RS-485 cable. At the LevelMaster, voltage should be greater than 11.5 Vdc.
J1-1 (GND)
J1-2 (+12 Vdc)
Negative voltage indicates damage to RS-485 cable.
If power is received at the LevelMaster board but the board is still not functioning,
this indicates the LevelMaster board is damaged.
The system has likely cold-started if the screen displays something similar to this:
XSeries Flow Computer
2100xxx-xxx (COPYRIGHT)
This requires uploading configuration files from the computer to the host hardware.
See the user manual for the host hardware and the help files in the host software.