Cooling fans
The cooling fan unit at the base of the inverter module contains two DC fans. The fans are
PWM-controlled according to an internal temperature measurement. The fan carriage can
be easily removed for fan replacement, or to allow access to the output cable connections
at the back of the cubicle.
The inverter module also has a small fan ventilating the circuit board compartment inside
the module. The fan can be serviced without removing the inverter module from the cabinet.
Control electronics
Inverter units consisting of one or several R8i modules employ a separate control unit (BCU)
that contains the BCON board with basic I/Os and slots for optional I/O modules. A fiber
optic link connects the BCU to each inverter module. Any safety circuits utilizing the built-in
Safe torque off functionality are connected to the BCU. The forwarding connector of the
BCU is wired to the inverter module(s).
The control electronics are typically located in a 300 mm wide control cubicle (DCU), which
also may contain components of the auxiliary voltage circuit and optional features such as
relays and circuit breakers. The cubicle can also contain the control equipment of another
inverter unit. A 400 mm wide cubicle is optionally available.
Cabinet layout
1…3 inverter modules may be installed in one cubicle. The width of the cubicle is 400, 600
or 800 mm respectively. Each module is equipped with dedicated DC fuses; a DC
switch-disconnector is optional. An inverter unit with a switch-disconnector also has a
precharge circuit including a charging switch on the door. When connecting the inverter unit
to the DC bus, the charging switch is closed first. After the precharging completes, the DC
switch-disconnector can be closed and the charging switch opened.
The picture below presents a cubicle with two R8i inverter modules with shrouding removed.
The top compartment of the cubicle is shown with and without optional DC
switch-disconnector and charging components.
28 Hardware description
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