Siemens SINAMICS V20 Operating Instructions Manual page 36

Electrical installation
4.1 Typical system connections
Note
Requirements for United States / Canadian installations (UL/cUL)
For configurations in conformance with UL/cUL, use the UL/cUL approved fuses, circuit
breakers and Type E combination motor controllers (CMC). Refer to the SINAMICS V20
Inverter Compact Operating Instructions for specific types of branch circuit protection for
each inverter and corresponding Short-Circuit Current Rating (SCCR). For each frame size,
use 75 °C copper wire only.
This equipment is capable of providing internal motor overload protection according to
UL508C/UL61800-5-1. In order to comply with UL508C/UL61800-5-1, parameter P0610
must not be changed from its factory setting of 6.
For Canadian (cUL) installations the inverter mains supply must be fitted with any external
recommended suppressor with the following features:
• Surge-protective devices; device shall be a Listed Surge-protective device (Category
code VZCA and VZCA7)
• Rated nominal voltage 480/277 VAC (for 400 V variants) or 240 VAC (for 230 V variants),
50/60 Hz, three phase (for 400 V variants) or single phase (for 230V variants)
• Clamping voltage VPR = 2000 V (for 400 V variants) / 1000 V (for 230 V variants), IN = 3
kA min, MCOV = 508 VAC (for 400 V variants) / 264 VAC (for 230V variants), short circuit
current rating (SCCR) = 40 kA
• Suitable for Type 1 or Type 2 SPD application
• Clamping shall be provided between phases and also between phase and ground
Danger to life due to fire or electric shock after the opening of the branch-circuit protective
device
The opening of the branch-circuit protective device may be an indication that a fault current
has been interrupted. In this case, fire or electric shock can result.
To reduce the risk of fire or electric shock, current-carrying parts and other components of
the controller should be examined and the controller should be replaced if damaged. If
burnout of the current element of an overload relay occurs, the complete overload relay
must be replaced.
Danger to life caused by high leakage currents for an interrupted protective conductor
The inverter components conduct a high leakage current via the protective conductor. The
earth leakage current of the SINAMICS V20 inverter may exceed 3.5 mA AC.
Touching conductive parts when the protective conductor is interrupted can result in death
or serious injury.
A fixed earth connection or a multicore supply cable with connectors for industrial
applications according to IEC 60309 is required and the minimum size of the protective
earth conductor shall comply with the local safety regulations for high leakage current
equipment.
36
WARNING
WARNING
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006