Installation, Operation and Service Manual
LKP Series
© 2016 DynAmp, LLC
Page 18
041738 I
5.8 METERING UNIT WIRING
Terminate all conductors from the 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). If 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 head while wiring them to the Metering Unit.
Complete the wiring job by connecting the external power lines to terminals TS3-3
(NEUTRAL), TS3-2 (PHASE), and TS3-1 (GROUND) in the Metering Unit.
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 of measured current. The wire should have an
insulation rating of 600Vac and 80°C minimum temperature rating.
If an external transformer is being used to supply power to the Metering Unit,
consider sizing the transformer to 30VA/kA. Over-sizing the transformer will keep
its temperature rise to a minimum due to the harmonic rich content of the AC
current drawn by the Metering Unit.
5.9 INITIAL SYSTEM CHECKOUT
Recheck all wiring connections against the drawings to ensure proper installation. When
they are satisfactory, turn on the system by first closing the external breaker or disconnect
(if used), and then the Metering Unit circuit breaker. Confirm that the POWER lamp is ON.
With the bus energized, the Metering Unit’s output in use should accurately measure the
bus current. However, it is now necessary to take a complete set of channel voltage
readings. These readings serve two purposes: One, to verify that all channels are
operating properly; two, to aid in magnetic centering of the head. With the bus current
operating at its highest operating level, take two sets of readings, the first set taken
immediately (to verify no condition exists that may cause damage to the LKP Metering
Unit), and the second set after a 24-hour period of time (to thermally stabilize the head).
Proceed as follows:
