ABB LevelMaster 7100, User Manual, Page: 93 / 100

LevelMaster 7100 User manual 2105835 Rev AA | 83
Error condition Check Procedure
V-BATT supply voltage
Using a digital voltmeter, measure transceiver V-BATT power supply
voltage between the following host hardware board J4 connector terminals.
Switched voltage should be greater than 11.5 Vdc.
J4-1 (GND [BLK]) and
J4-2 (V-BATT)
Hardware wiring
Line driver voltage
Using an oscilloscope or digital voltmeter, connect to the host hardware
board J4 connector between the following terminals:
J4-4 (BUS+) and J4-6 (BUS-) COM1
J4-12 (BUS+) and J4-13 (BUS-) COM2
Voltage should vary b5 Vdc and 0 Vdc when communication data
is being transmitted from CCU to XFC.
Request to Send (RTS) voltage
Using an oscilloscope or digital voltmeter, connect to the XFC-195 board
J4 connector between the following terminals:
J4-1 (GRD) and J4-8 (RTS) COM1
J4-1 (GRD) and J4-14 (RTS) COM2
Voltage should be +5 Vdc when sending data to CCU, 0 Vdc when not
transmitting.
When RTS is high, the transmitter must be keyed and transmitting data.
Is host hardware
operating?
Battery voltage
Verify battery pack voltage is at least 11.5 Vdc.
See the troubleshooting section of host hardware user manual.
Annunciator display
“R” (LevelMaster Protocol) not
displayed
Protocol selected for the communication port may be incorrect.
Configure the correct protocol. See section 6.2, Set up general and
communications parameters .
Wrong position
Make sure the annunciator has the communications port displayed, not the
LevelMaster.
Wrong port wired Verify wiring.
No “R” is visible in the
annunciators
LevelMaster annunciator is not assigned.
Follow instructions for setting up the display. See section 6.4, Configure
the LCD display .
Communication port
configuration During polling, the “R” is not
replaced by an
→
and/or
←
Depending on the baud rate, the user may not see both, but should see the
“R” become at least one of these arrows.
Ensure data parameters are set correctly for the unit.
If using an X Series unit, the LevelMaster Request Block file not
downloaded to the Level subdirectory of the communications port.
If it is an older unit, check the tank parameters to ensure the tank is
enabled and the duty cycle is off.
No float level, but
temperature reads ok.
Check power source
Check the voltage of the power source. The sensor needs 8.5 Vdc to
acquire a level reading. Temperature and communication require only 5
Vdc. When using MasterLink and the LevelMaster test cable, the sensor is
powered by the batteries on the cable. If the output voltage of the battery is
below 8.5 Vdc, the sensor will not report a level; however, the sensor
board will communicate with the MasterLink program, and a temperature
will be reported.
Troubleshooting existing installations
Troubleshooting techniques will vary slightly when an installation was previously working but now is not. When the location has
already been functioning properly, the assumption is that an event has occurred to render it inoperable. First look at equipment
failures possibly caused by damage from an external source, for example: a power surge caused by a storm.
The two main groups of problems are:
Hardware
Software
To help determine which types of problem(s) exist, see Table 11 for error conditions, checks, and procedures.