Implementing earth fault protection
If the converter unit does not have a built-in earth fault protection system, the customer
(or the system integrator) must install an earth fault protection device and connect
it to the converter unit.
The DC/DC converter control program can be configured to trip on a fault or give a
warning when external earth leakage is detected. For more information, refer to the
firmware manual.
Implementing an interlocking between the disconnecting
devices
The customer (or the system integrator) must implement an interlocking circuit
between the DC switch-disconnector of the drive [Q11] and the energy storage
disconnector (isolator). The user must not be able to close the energy storage
disconnector (isolator) before closing the DC switch-disconnector of the drive [Q11].
Selecting and routing the energy storage cables
￭
Cable selection procedure
Select each power cable as follows. Obey the local regulations.
1. Select the cable type. Obey the general guidelines and recommendations for the
drive power cabling.
2. Select the cable size.
Cabinet-installed multidrives: Refer to the listing of typical power cable sizes given
in the technical data of the multidrives unit hardware manual.
3. Make sure that the short-circuit rating of the cable is sufficient. Take into account
the disconnection time of the protective device. If the rating is not sufficient,
select a larger cable, increase the number of parallel cables or change the cable
to a type with higher conductor temperature rating.
4. Select the cable lugs.
5. Make sure that the cable can enter the cabinet through the cable entry plate.
Cabinet-installed multidrives: Refer to the dimension drawings of the drive delivery
or technical data in the multidrives unit hardware manual. For special cable entry
solutions, consult ABB.
6. Make sure that there is sufficient space to install the cable(s) and cable lugs to
the terminals.
Cabinet-installed multidrives: Refer to the terminal and cable entry data given in
the technical data of the multidrives unit hardware manual.
￭
Recommended cables
The customer (or the system integrator) must acquire and connect the energy storage
cables. It is possible to use shielded cables with 2, 3 or 4 conductors. ABB recommends
to use shielded cables with 4 conductors.
46 Guidelines for planning electrical installation
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