Installation, Operation and Service Manual
LKP Series 4 Channel OEM
© 2019 DynAmp, LLC
Page 23
041593O
Notes on items a and f above:
1)
Under certain conditions, external magnetic fields can reverse one or more channels in
the Measuring Head. The accuracy indicators will show an error in those channels until
the bus current level rises high enough to effectively turn on all channels (2-3Vdc is the
minimum reliable channel voltage). This condition can cause false alarms. For more
information on this, please refer to technical bulletin TEC9908, “Resolving External
Magnetic Field Errors”.
2)
In some installations, when the channel voltages are balanced, the channel LEDs will
remain on, even though the bus is turned down to zero. In this case, the accuracy
diagnostics circuit is in an unstable condition and alarm faults, as indicated by the
channel LEDs, should be ignored. Note that, in general, the Metering Unit’s 0.1%
accuracy is only guaranteed when the primary bus current is above 5% of the full scale
rating of the unit.
A relay contact output is available to connect to a remote warning system. The relay is closed
under normal operating conditions and opens when a fault condition occurs. The output
connections are available via a connector located on the left side of the Metering Unit. The
terminals are designated on the appropriate interconnection diagram. The terminals are used
as follows:
Contact Terminals
Condition
37-38
37-39
Open
Closed
Fault condition, zero bus current*, or Metering Unit turned
off
Closed
Open
Normal operation
*
See notes above on zero bus current condition
