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Installation and Connection
3.4 ELECTRICAL INSTALLATION
DANGER!
The following information is merely a guide for proper installation. Comply with applicable local
regulations for electrical installations.
DANGER!
Make sure the AC power supply is disconnected before starting the installation.
ATTENTION!
The UR11 can be connected in circuits with symmetrical short circuit capability up to 150000 Arms
(480 V/690 V maximum).
ATTENTION!
3
Branch circuit protection must be provided in accordance with applicable local codes.
3.4.1 Input Circuit Breaker
DANGER!
A switching device must be provided in order to perform the power supply connection/disconnection.
This device must be able to disconnect the power supply from the rectifier whenever necessary (e.g.:
under maintenance).
The main circuit breaker must be sized to withstand the inverter rated current and its short circuit level must
be compatible to the application (see "AFW11M mounting guide" for more details). When the circuit breaker
is closed, power is applied to the UR11 starting at the pre-charge of the DC link. In case of failure in some
inverter, or emergency (remote or local), the circuit breaker can be switched off by the undervoltage release
coil protection.
3.4.2 Cables/Bus Bars
The panel bus bars must be sized according to the panel input current and the rectifier output current. It is
recommend the use of copper bars or cables. In case that aluminum bars have to be used, it is necessary to clean
the contacts and to apply an antioxidant compound. If the compound is not used, any copper-aluminum junction
will suffer accelerated oxidation. Refer to
The interconnection between the UR11 output and the DC bus can be done with flat braided cables sized to
withstand the UR11 output DC current (see specifications at
3-7
presents an example of flat braided cable used by WEG.
3-6 | UR11
item 3.4.6 UR11 Connections on page 3-13
Table 7.1 on page
for more information.
7-2). The
Figure 3.7 on page
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