Siemens Sinamics PM250 Hardware Installation Manual page 28

Connection
Danger to life due to fire or electric shock when using unsuitable residual current protection
devices
The inverter can cause a current to flow in the protective conductor. This current can cause
the residual current device (RCD) or residual current monitoring (RCM) to incorrectly trip
(nuisance trip). In the case of a fault (ground fault), the fault current can contain a DC
component, which prevents the RCD/RCM from tripping, with the risk of subsequent fault or
electric shock.
• Use the protection and monitoring devices recommended in the documentation.
Risk of injury due to hot surfaces
During operation and for a short time after the inverter shuts down, the surface of the
device can reach a high temperature.
• During this time, avoid any direct contact with the surface of the inverter.
Protection and monitoring equipment
One of the following measures is suitable in order to ensure touch protection for the inverter:
● Isolated line supply (IT line supply) for frame sizes FSC ... FSF:
Create an isolated line supply for the inverter using an isolation transformer.
● Residual current device (RCD) or residual current monitoring (RCM) for frame size FSC:
The equipment must satisfy the following properties and general conditions:
– super-resistant RCD/RCM type B, with a trip current of 300 mA.
– Only one inverter is supplied from each RCD/RCM
– The motor cables are shielded and are not longer than 50 m. You can find additional
Note
Fuses and residual current devices and/or monitoring devices
A residual current device (RCD) or residual current monitoring (RCM) does not replace the
fuses listed in the Technical data.
28
WARNING
CAUTION
e.g. a SIQUENCE circuit breaker from Siemens.
information on the motor cables in Length of motor cable (Page 34)
Hardware Installation Manual, 01/2016, A5E36265179B-AA
PM250 Power Module