Riello MULTI SENTRY MST 100, Руководство пользователя

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D
IFFERENTIAL
In the absence of an input separating transformer, the neutral from the mains power supply is connected to the neutral of the UPS
output. This way the neutral regime of the equipment is not modified.
THE INPUT NEUTRAL IS CONNECTED TO THE OUTPUT NEUTRAL
THE DISTRIBUTION SYSTEM THAT POWERS THE UPS IS NOT MODIFIED BY THE UPS
WARNING: make sure that the equipment is connected correctly to the input neutral, or else
damages to the UPS may be caused.
The neutral regime is modified only in presence of an isolation transformer or when the UPS operates with a neutral
isolated upstream.
DUAL INPUT versions: the neutral for the input line and bypass line are shared inside the device.
A single differential switch must be fitted upstream of the point at which the line divides to supply the trip switch-
protected rectifier and bypass inputs for the UPS. See following diagram:
PARALLEL versions: In order to prevent false activations where several machines are connected in parallel, a
single differential switch should be fitted upstream of the entire system. See following diagram:
When operating from mains power, a differential switch located at the input can intervene as the output circuit is not isolated from
the input circuit. Anyhow, other differential switches can be inserted at the output, possibly coordinated with the switches at the
input.
The differential switch located upstream must have the following features:

Differential current adjusted to the sum of the UPS load. It is strongly recommended to keep an adequate margin in order
to avoid delayed interventions (100mA min. - 300mA recommended)

type B

delay greater than or equal to 0,1s