Riello UPS MASTER HE, User Manual

Page: 38 / 57

pag. 38 / 57 0MNMHEM30RUENUB 00
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4.2.4 External maintenance bypass.
In some cases, in order to facilitate maintenance operations of the
individual units making up the system, it may be advisable to
install an external maintenance bypass.
The new disconnector located on the bypass line (Q2) must be
provided with auxiliary contacts (one for each UPS). The position
of the contact is opposite to the position of the switch, thus the
contact must be closed when the disconnector is open.
The contacts of each disconnector must be connected to the corresponding UPS terminals, as shown in the diagram.
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