Installation, Operation and Service Manual
LKP Series 4 Channel OEM
© 2019 DynAmp, LLC
Page 12
041593O
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 Measuring Head Resistance Chart Table 4.1 or 4.2
and /or schematics for coil circuit wire numbers.
Warning : Keep all exposed head cable leads from touching the bus, ground, or any
support structures.
ii.
Consult with DynAmp about using a shorting plug at each connector.
4.5 INSTALLATION PRECAUTIONS (LIVE BUS)
If the unit is to be installed on a live bus, the following precautionary measures must be taken
before installing the Measuring Head:
a. Connect the cables to the Measuring Head and then connect the other end to Metering
Unit, or follow steps b and c.
b. The Measuring Head cable leads from the channel feedback coils must be shorted
together and isolated from all other cable leads and ground to prevent induced high
voltages on the coil leads. (14, 15, 16, 17)
c. Magnetic sensor leads must be isolated from ground and all other leads. This can best be
accomplished by taping over the individual lead connections. (6, 7, 8, 9, 10, 11, 12, 13)
Always follow all local and plant safety procedures.
WARNING
If the installation is to be made on a "live" bus, the Measuring Head cable leads
must not contact ground or personnel. A condition hazardous to the Measuring
Head and any person handling uninsulated cable-lead terminals will result if metal
parts of the head contact the bus.
4.6 COMPLETING THE MEASURING HEAD INSTALLATION
With the Measuring Head temporarily installed and bus current off (or the head removed from
the bus for verification prior to installation), complete the following steps.
For models LKP-6 and LKP-12, connect the interconnecting cable to the terminal block near the
Measuring Head. For all other models, connect the interconnecting cable directly to the
Measuring Head.
Before connecting the other end of the interconnecting cable to the Metering Unit, perform the
ohmmeter tests in Table 4.1 and 4.2. The tests are made from the open end of the cable,
looking back towards the Measuring Head. Record these values for future reference.
NOTE
You cannot get good ohmmeter readings if the Measuring Head is on a live bus. The coils
pick up induced voltages from any rectifier ripple. The Hall plate resistance changes in a
high magnetic field.
