Siemens 3RK1308‑0 00‑0CP0 Series Equipment Manual page 51

Bright and dark tests
With bright and dark tests, safety relays such as ET 200SP F-PM-E (6ES7136-6PA00-0BC0)
or SIRIUS 3SK check whether their safe outputs can still be activated and deactivated. The
bright and dark tests are run cyclically. The ET 200SP motor starter is intended for operation
with an F-PM-E or 3SK connected upstream and is adapted to the bright and dark test times
of these devices.
You can find more information on the operating principle and parameter assignment of bright
and dark tests in the respective device manual.
To avoid an unintentional response of the fail-safe motor starter during the bright and dark
test, these tests must not exceed a certain time. Due to component aging, the permissible
read-back time can also decrease throughout the motor starter's service life. The voltage of
the power supply unit also has an influence on the permissible read-back time. Increase the
power supply unit's output voltage to minimize the risk of incorrect deactivation during dark
tests.
By trial and error, set the read-back time as low as possible, but so high that the output
channel is not deactivated.
Inadvertent starting of the motor if the bright test lasts too long
The motor can start if the bright test lasts more than 10 ms. There is a risk of severe injury
or death. Material damage is also possible.
Make sure that the bright test lasts less than 10 ms on devices that are connected
upstream of the motor starter.
Power supply
In the case of a 24 V DC power supply, observe the following safety measures:
● Ensure safe electrical separation and separate routing of cables.
● Ensure increased insulation of the extra-low voltage (SELV/PELV) from circuits with
hazardous potentials in accordance with IEC 60364-4-41.
● To deactivate safely via the 24 V power bus, use a suitable power supply in compliance
with the requirements of the safety classification used.
● In corner-grounded delta networks, ensure increased insulation of the extra-low voltage
(SELV/PELV) from circuits with hazardous potentials in accordance with NFPA 79.
Motor starter (3RK1308‑0**00‑0CP0)
Equipment Manual, 11/2019, A5E34821005002A/RS-AC/003
WARNING
Product features
5.8 Operating motor starters
51