Eaton 93PR Series - 4.5.1. Overview of power cables; CAUTION

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Eaton 93PR 15-80 kW UPS

Installation and Operation Manual

the longest one.

Output

The N wires of all the UPS units must be connected. The shortest cable between each UPS and the power

source shall be greater than 95% of the longest one. The measurements start from the output node of the

UPS.

Dual power supply

The rectier input and bypass input are separate power supplies. The power supply must use a common N

wire.

Battery connection

In the case of parallel use of Eaton 93PR UPS 15–80k, both common battery and separate battery congu-

rations are supported among the cabinets. Please see Section 4.2.1 for information about supporting com-

mon battery conguration.

Installation of parallel system, signal wires of parallel system and CAN communication

control wires

CAUTION

• In a parallel system, the electric line from the input of each UPS to the common point

of the AC power source shall be identical with that from the output to the common

point of the load in length. The length shall meet the following regulations to ensure

that the input resistance and output resistance of each UPS matches each other, and

resistance error shall be controlled within ±10%. The purpose is to ensure current

sharing of parallel UPS. It’s advised that the input and output cables of the parallel

system are longer than 10m in total, 5m for either input or output.

• Total length 1A=2A=3A=4A

1B=2B=3B=4B

1C=2C=3C=4C

See

Figure 4-5

for the wiring diagram

• If only two UPS units are connected in parallel (redundancy), the above requirements

are not mandatory, but the future expansion might be affected if the requirements are

not satised.

• Ensure that the static bypass input of each UPS in the parallel system is the same

common point, like an external bypass circuit breaker. If the rectier input of each

UPS in the parallel system is a separate power source, please consult Eaton engineers

to ensure the compatibility of power distribution.

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