Installation, Operation and Service Manual
LKP Series 4 Channel OEM
© 2019 DynAmp, LLC
Page 14
041593O
4.7 METERING UNIT INSTALLATION
The location of the Metering Unit should be determined by the following factors:
a. An indoor location where the ambient air temperature is within -20°C to +55°C at all times
should be used.
b. The location should be within reach of the Measuring Head cable length to be routed.
c. The location should be approximately 8 feet (2.5 meters) or more from high current bus
bars. (Some installations have been made much closer to high current buses without
difficulty, but the distance given is on the safe side.)
d. Mount the Metering Unit on a wall, column, instrument panel, or other convenient location
(refer to outline and mounting diagram in the back of the manual).
NOTE
The Metering Unit is convection-cooled, and does not need external cooling unless
customer-mounted inside an enclosure. The Metering Unit does not contain filters,
and requires a non-corrosive, relatively dust free environment.
4.8 METERING UNIT WIRING
Before connecting the (feedback) current-loop output circuit to TB1-22 and TB1-23, use an
ohmmeter to make sure the output circuit is continuous and that the total resistance is within
limits. The maximum allowable resistance is calculated by dividing the maximum output voltage
(15 Vdc) by the full-scale output current of the system. For test purposes, a dc ammeter of the
proper range can be used in place of the actual output circuit.
Terminate all conductors from the Measuring Head as shown in the interconnection diagrams in
the back of this manual. As an aid to wiring, each conductor is identified by a numbered sleeve
(or imprinted numeral), which corresponds to the correct terminal destination. You should
always use the wire numbers when making connections as wire colors may vary, or appear
different under certain lighting conditions. If the wire ends get damaged and require re-
stripping, use high quality wire strippers and set the strip length to 0.39” (10mm).
Install and connect the output monitoring devices to the appropriate terminals at the Metering
Unit (refer to interconnection diagram). When the current output is used, remove the factory-
installed jumper and connect the desired current output circuitry, using an adequate wire size.
Make sure that the burden imposed by the wire is not excessive.
NOTE
If bus current is on, bus ripple or sudden changes in bus current level will induce
significant voltages in the feedback coils. Therefore, the cables must be disconnected
from the Measuring Head while wiring them to the meter unit.
Connect ac line power to the terminals TB1 as follows: ground to terminal 1; phase to terminal
2; and neutral to terminal 3. OEM units are not equipped with a power switch.
Customer is responsible for supplying an external circuit breaker or fuse with proper
rating as required by local codes for branch circuit protection when wiring the mains
circuit to this Metering Unit. Each Metering Unit must have its own breaker. Use a wire
and breaker or fuse (time delay) sized adequately for the maximum burden of 20 VA/kA
