Description
3.3 Accessories
Installation and Operating Instructions SINAMICS G180
42
Operating Instructions, 02/2019, 4BS0751-007
Risk comparison
In order to rule out possible risks in advance, a risk analysis according to EN 1050 or
DIN EN ISO 14121 (draft standard) has been performed for the shutdown path. This analysis
concluded that the risk of loss of the shutdown function is small due to the redundant design
of the shutdown route and the use of reliable components. However, no general risk
assessment was performed as this is usually dependent on many customer-specific
parameters. This must be taken into account for the implementation and operation of a
system. In comparison to the shutdown using contactors, only the additional hazard die to
dangerous shock currents occurred in the converter.
Due to the redundant design, it is even achieved that the shutdown is still ensured even if a
fault in the electronic shutdown route occurs. As components proven in operation are also
used, the converter is in compliance with EN ISO 13849-1:2008, Category two.
WARNING
Danger of explosion in the case of deactivated shutdown
In principle, the shutdown function can be deactivated by connecting an appropriate resistor
instead of the PTC thermistor to the control cable terminals.
3.3.2.3
"Safe torque off" with single circuit trip
The control cable terminals -X2:19, -X2:20 provide a safety-oriented input for safe torque off
to EN ISO 13849-1:2008 category three. This input safely prevents starting the machine.
Use this input, for example for safe shutdown in the case of servicing work on the machine.
When using the input, remove the jumper inserted between the control cable terminals
-X2:19, -X2:20.
The "Safe halt" function and the ATEX-certified PTC thermistor input have a redundant
switch-off path in the converter. The implementation is performed using hardware. A relay in
the power section of the converter disconnects the power supply of the IGBT drivers. A
second circuit, also via hardware, produces a controller block. Both switch-off paths are
based on the closed-circuit principle, i.e. a failure of the control voltage results in redundant
shutdown of the converter.
WARNING
Electric shock
If you carry out maintenance or overhaul work on the converter without safely disconnecting
the power supply, serious injury or death due to electric shock can occur. The input for
"Safe halt" is not an Emergency Off input which safely disconnects the converter or the
motor from the mains power supply.
Safely and reliably disconnect the power supply before opening covers or terminal boxes at
the converter. For example, use a main switch.
