Siemens PM240-2 Hardware Installation Manual page 36

Connecting-up
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:
● Frame sizes FSA ... FSF: Create an isolated line supply (IT line supply) by using a
transformer to isolate from the line supply
● Frame sizes FSA ... FSC: Residual current device (RCD) or residual current monitoring
(RCM) with the following properties and secondary conditions:
– You are using a super-resistant RCD/RCM, type B with a tripping current of 300 mA.
– Only one inverter is supplied from each RCD/RCM
– The motor cables are shielded and not longer than 50 m.
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.
36
WARNING
CAUTION
e.g. a SIQUENCE circuit breaker from Siemens.
Motor cable length (Page 43)
Hardware Installation Manual, 12/2015, A5E33294624B AD
Power Module PM240-2