Hubner U-ONE-SAFETY-LWL Generation II, Operating And Assembly Manual

Page: 32 / 36

U-ONE
®
-SAFETY-LWL
Configuration manual
32
USL_KonfigManual-en_R3
7.2 Timing
Power on time
Internal diagnostic measures are carried out first after the supply voltage is switched on, before
the USL is ready for operation.
Function Time
Power on time
≤ 4 s
7.3 Safe state

If an error is detected, at least one error output on the UO-
SCU is switched to “low”.

If the function “safe error switch” is used, the switching contacts will open if there is an error.

The bus modules UO-SPN-1 and UO-SPB-1 passivate data for the safety channel
7.4 Safety times
Responding to an error Time
Error outputs of the UO-SCU at low level
≤
50 ms
Open the switching contacts on the error
relay
≤
60 ms
Passivate the data from the bus module
≤
57 ms
The speed diagnosis requires a measuring angle of 5°. At low speeds, this can extend the
diagnosis time.
7.5 Information on functional safety
CAUTION!
1. The user must ensure that the system limits for the basic device are not
exceeded when the device is switched off (see section 3.5).
2. If possible, all devices/switches should transition to a safe state or safe
conditions when the switch is opened (see EN ISO 13849-2:2013 table D.2).
3. In applications without a safety PLC, an error switch on the USL must be
switched so that the application enters a “safe state” when the
switch is
opened (basic safety principle).
4. In applications with a safety PLC, both error output channels (Error1, Error2)
must be analysed or point 3 must be implemented. The test pulses must be
suppressed in the application, to avoid accidental switching processes.
5. In case of an error (at least 1 error output on low level and / or error switch
open), the PLC must take appropriate measures so that the application
enters
a “safe state”.
6. The USB interface may only be used for configuration and commissioning,
and is not designed for continuous operation.
7.
The option “Error reset via the reset input or interrupting the power supply”
may only be used if a risk analysis has indicated that the application is
suitable for this purpose.
8.
A preset can only be set “on the fly” if a risk analysis has indicated that the
application is suitable for this purpose.
9. The relay contacts must be protected against overcurrent via a pre-fuse
(2A).