Installation, Operation and Service Manual LKP Series
© 2020 DynAmp, LLC Page 11
041736 N
Most models interconnection cables have a GRN/YEL wire that is used for Measuring
Head grounding. To electrically float the head above ground potential, the GRN/YEL
wire from each cable must be disconnected at the Metering Unit. Note that for safety
reasons, the Metering Unit cabinet should be grounded at all times.
G.) Do not loosen any of the bolts that hold the Measuring Head casting sections together.
Doing so, will compromise the seal between parts and allow water or contaminants to
enter the Measuring Head.
H.) The Measuring Head must be installed with current arrows in the same direction as
conventional current flow in the bus. An arrow indicates the direction that conventional
bus current must flow through the aperture (+ to -). No damage will occur if the
Measuring Head is reversed, but an LKP system will not produce an output in this
condition.
I.) CAUTION: The part-line insulation pieces (located on the mating surfaces of the head)
contain sensitive electronic devices, are brittle, and can be easily damaged if one is not
careful during installation.
J.) Make sure that the serial number on the top half of the Measuring Head matches the
serial number of the lower half, and that the halves go together squarely and evenly
without forcing, twisting, or cocking.
K.) Try to mount the Measuring Head in an area free of other bus bars. This is not an
essential requirement if a satisfactory magnetic centering can be achieved.
L.) Final Measuring Head position will be determined by the magnetic centering process,
so the Measuring Head support members should be temporary at first. If a bus
analysis has not been performed, the Measuring Head should be geometrically
centered on the bus during the initial installation. If a bus analysis was performed,
follow the recommendations for initial positioning, and also perform the centering
process.
M.) After final magnetic centering, the Measuring Head must have adequate support.
Sudden changes or shutdown of bus current can induce high voltages in open coil circuits
inside the Measuring Head. This is a risk of shock if someone is in contact with the
connector pins during the event. There is a slight possibility of connector or coil damage if
the Measuring Head is left un-operation (stored) for prolonged periods on a live bus with
frequent fluctuations. The following precautionary measures must be taken to prevent
damage and risk of shock.
Best option is to leave the cables connected between Metering Unit and Measuring Head.
Even if the Metering Unit is not powered, it will shunt induced currents in the coil and
prevent high voltage from developing. If that is not feasible then use one of the following
options:
i. The Measuring Head cable leads from the channel feedback coils must be shorted
together and isolated from all other cable leads and ground wire to prevent induced
high voltages on the coil leads. Refer to the Head Resistance Chart and /or
schematics for coil circuit wire numbers.
Warning : Keep all exposed Measuring Head cable leads from touching
the bus, ground, or any support structures.
ii. Consult with DynAmp about using a shorting plug at each connector.
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