AMU Installation
10
CURRENT TRANSFORMERS
Incoming power must be de-energized before installation.
Before wiring, de-energize the CT secondary by shorting it via a
shorting block.
The current transformer must have its secondary terminals short-
circuited or connected to MCU unit, before energizing the primary
circuit.
Under no circumstances must the CT secondary be left open-
circuited, even momentarily, when primary current is flowing. This
causes high voltages that will overheat and explode the secondary
of the CT and damage the instruments as well.
Before disconnecting any MCU unit to or from a current
transformer, the secondary terminals of the transformer should be
shorted using a link capable of carrying several times the nominal
output current (i.e. at least 10A).
Current & Voltage Connections
1. Select appropriate, 1 Amp or 5 Amp, AMU for voltage and current connections. AMU
for 1 Amp is provided for direct connections to the existing current transformers with 1
Amp secondary outputs of the motors with measurement units.
2. Plug voltage sockets to AMT Toolkit and connect the alligator clips to the motor
terminals or other location for direct contact with the conductors.
3. Connections for Low Voltage (≤ 480V AC), Medium Voltage (> 480V AC) and Inverter
Driven equipment are described. Follow the steps appropriate for the motor type.
There are four sets of CTs supplied with AMT Toolkit. These are 100/5A, 200/5A,
300/5A, and 400/5A.
3.1. Low Voltage Motors: For 5 Amp AMU, plug current socket to AMT Toolkit, connect
current cables to multi ratio current transformers supplied with AMT Toolkit and
connect multi ratio current transformers to equipment's 3 phase supply cables.
Connect current cables to multi ratio current transformers as described below
according to motor’s nominal current.
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