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If the mushroom pushbutton is not installed in the drive cabinet, both control circuits of the "Safe
Torque Off" function are wired to the customer terminal strip. In complex systems the interface
via the terminal strip is used to integrate the "Safe Torque Off" function in the higher-level fail-
safe controller. According to the specification of the safety relays, the permissible cable length
at the safe inputs is 2000 m (1000 m inward + 1000 m outward).
The "Safe Torque Off" mushroom pushbutton is a positively-opening mushroom pushbutton.
The mushroom pushbutton has the following features:
● Two NC contacts (dual-channel activation)
● Positive latching
● Rotate to release using the following elements:
The mushroom pushbutton is connected via a 4-wire shielded control cable with a wire cross
section ≥ 0.5 mm
wiring system according to EN60204-1.
If the "Safe Torque Off" mushroom pushbutton is connected through a fail-safe PLC, this must
also be implemented with two channels. The PFH
terminal strip -X110 ("Safe Torque Off" mushroom pushbutton or "Safe Torque Off" mushroom
pushbutton and fail-safe controller) must be ≤ 0.5 x 10
Figure 3-10
After closing the two control circuits of the 3TK2842 (releasing the mushroom pushbutton or
appropriate control signals on the terminal strip), to restart the drive requires an additional
second action of acknowledging the Safe Torque Off signal in the Control Unit. The drive can
be enabled by acknowledgment via an acknowledge button, which can be read-in via binary
input as well as via a higher-level automation (control platform). The acknowledge button must
SINAMICS SM150 6SL3815-7NP41-0AA1
Operating Instructions Rev.201910281301 EXAMPLE
– Actuating element
EMERGENCY STOP / EMERGENCY OFF control device according to ISO 13850/
EN 418 and IEC 60947-5-5, e.g. Siemens 3SB3000-1HA20.
– 2NC switching element
Positive opening according to IEC 60947-5-1, Annex K, e.g. Siemens 3SB3403-OE
, e.g. Gore GSC-01-4097-00 4 x AWG 20 (0.62 mm
2
1
2
3
4
Connection possibilities - mushroom pushbutton "Safe Torque Off"
3.6 Description of options
). Choice of cables and
2
value for all external devices connected to
D
in total.
-6
1
2
Description
3
4
53
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