Installation, Operation and Service Manual
LKAT
2
+24V
© 2018 DynAmp, LLC
Page 21
046404 E
Main PCB LED is a RED / GREEN the Accuracy Diagnostics status LED. This LED indicator
and Main PCB relay CR2 contacts may be used to monitor the following conditions:
•
Measuring Head imbalance
•
Power supply failure
•
Measuring Head disconnected
•
Sensor electronics failure
•
Other circuit failures causing loss of measurement accuracy
Occurrence of one or more of the conditions above will change the state of the CR2 relay coil,
changing the state of the contacts and changing the LED indication from green to red. Refer
to the section “Troubleshooting an Accuracy Diagnostics Fault Indication” in this section for
more information about determining the cause and eliminating a fault condition.
Refer to section “Failsafe” / “Non-Failsafe” Configuration in this chapter for more information
about Alarm Relays.
5.4 LKAT
2
METERING UNIT
Refer to drawings in the back of this manual.
Input power connects to the Power Supply pc board assembly. The power supply pc board
includes a non-replaceable slo-blo type fuse, in-rush and overcurrent protection, as well as
MOV overvoltage clamping. The power supply provides outputs of ±15Vdc and +12Vdc
required by the system electronics. These outputs connect to the Main pc board assembly via
a short wire harness.
Connections to the Measuring Head are made via the Main pc board assembly.
5.5 LKAT
2
MEASURING HEAD INTERCHANGEABILITY
DO NOT connect LKAT Classic or LKAT Plus Measuring Head to an LKAT
2
Metering Unit –
doing so will damage the Measuring Head.
LKAT
2
Measuring Heads of various sizes will operate properly when connected to the LKAT
2
Metering Unit. However, the LKAT
2
System is
factory calibrated as a system.
As a result,
optimal measurement accuracy is achieved when the Metering Unit is connected to the head
it was calibrated with, and installed on the size bus bar it was designed for.
5.6 TROUBLESHOOTING AN ACCURACY DIAGNOSTICS FAULT
INDICATION
A problem may be detected when the LKAT
2
System is energized with A and B head cables
connected to the Metering Unit. When the Main PCB AD status LED illuminates RED and /
or Main PCB CR2 status relay coil changes state, a possible fault condition has been
detected. This is true whether or not the Measuring Head is installed on the bus. The
following table is intended to help the user determine and eliminate the cause of the fault.
