User Manual

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Packet Power™ Monitoring Module Users Manual

1. The C/T must be approved by Packet Power for use with the PMM.

2. The C/T must be sized correctly for the maximum current of the circuit being

measured.

3. The C/T must meet all local and national safety requirements relevant to the

installation, including but not limited to maximum voltage and any other relevant

mechanical requirements.

4. The output of the C/T must be compatible with the PMM. There are two versions of

the P5T3 PMM, one designed to work with certain un-shunted C/Ts and one

designed to work with certain shunted CTs. In order to receive accurate readings, the

PMM firmware must be programmed to match the exact specifications of the C/T that

is being used.

5. Each C/T input is fuse-protected with a 250mA safety fuse. Safety fuses are not

field-replaceable.

6. Using the wrong C/T can result in damage to the PMM and inaccurate measurement

readings. Please use only the C/T’s supplied by Packet Power with your PMM.

Sample C/T’s and their associated current range are shown below:

Current transformer

Max. monitored current

PacPow 35A, Geist 35A

35A

Geist 8688

72A

CR Magnetics CR 3110-3000

106A

JD-JC24-200

235A

Note that C/T’s may provide less accurate readings at loads under 5-10% of their maximum

rated current.

Installing the current transformer connections

Once the appropriate current transformers have been chosen they should be installed over

the appropriate load-carrying lines and connected to the PMM terminals according to the

configuration diagram. Please note that current transformers are polarized (i.e. the two wires

are not interchangeable) – if swapped, the PMM will detect energy as flowing in the opposite

direction (“running the meter backwards”). Please refer to current transformer data sheet to

determine the correct connection or contact Packet Power.

Note: You must ensure the current transformer(s) you have selected is approved by

Packet Power and matched correctly to maximum rated load of the conductor on

which it will be used. You are responsible for understanding how to correctly select

and use the appropriate current transformers for the type of power you wish to

monitor. Failure to correctly size and install the current transformers could result in

product failure and hazardous operating conditions.

Installing the voltage circuit connections

Please connect the appropriate monitored voltage lines to the appropriate PMM terminals

using 14-20AWG wire that meets all relevant safety standards.

Note: You must ensure that all connections (“taps”) being made to the load-carrying

lines satisfy relevant safety codes and local regulations. You are responsible for

understanding how to perform this connection. Failure to correctly perform this

connection could result in product failure and hazardous operating conditions.

Verifying PMM connections

Before mounting the PMM please verify that: