Lenze ECSCSxxx - Manual (Page 77)

Electrical installation
Control terminals
Safe torque off
5
l
77 EDBCSXS064 EN 4.0
Description of the function
ƒ The "PNOZ" safety switching device has a two−channel effect on the controller. In
the case of an emergency stop request the two channels (terminals 14 and 24)
become deenergised. The safety switching device monitors the diagnostic output of
the controller.
ƒ The safety switching device is provided with test pulses at the output side, so that
short circuits within the wiring are detected.
ƒ Diagnostics is effected via the wiring of diagnostic output SO to input Y7 of the
safety switching device. Y7 is the input of the feedback loop which has to be on
HIGH level (+24 V) before the outputs 14 and 24 are activated. There is only HIGH
level if both disconnecting paths have switched off.
ƒ At least once a year a manual test has to be carried out to verify the independence
and cutout ability of the two disconnecting paths.
Manual test of the disconnecting paths
ƒ The disconnecting paths have to be checked individually in succession.
ƒ When any test key (T1, T2) is pressed the motor has to become torqueless
immediately. Additionally the brake has to be applied, since the supply of the brake
is switched off via contact X6/B+.
ƒ When the safety switching device is switched off, or if both pushbuttons are pressed
at the same time, the STO state has to be signalled via the indicator light H1. In all
other states this message has to be inactive.
If a deviation from the response described above is determined, the controller must be
switched off immediately. Eliminate the fault before restarting the controller.
For obtaining a Performance Level PL
d
(SIL 2), only components which also comply with the
requirements for PL
d
in accordance with EN ISO 13849−1 or SIL 2 in accordance with EN
62061 are to be used in all upstream applications!
,
Interconnection examples can be found in the download area (Application
Knowledge Base) at:
www.Lenze.com