SEW-Eurodrive MOVIPRO PHE Series, Руководство по эксплуатации, Страница: 21 / 100

3
Functional safety
Connection variants
Operating Instructions – MOVIPRO
®
PHE..B-A15-.1X0..B-00
21
3.2.5 Startup requirements
• Startup of the system/machine must be documented. The safety functions of the
system/machine must be checked and verified.
Observe the limitations for the safety functions of the device provided in chapter
"Limitations" (→
2 18) when verifying safety functions. If necessary, deactivate
non-safety-related parts and components, such as the motor brake, that affect the
result of the verification.
• For operating the device in safety-related applications, the disconnecting device
and correct wiring must always be verified and documented during startup. A dis-
connecting device is, for example, a safety relay or a safety controller.
• During the startup procedure/function test, the correct assignment of the respect-
ive voltage supply must be checked by a measurement.
• The function test must be carried out in succession for all potentials, i.e. separ-
ately.
3.2.6 Requirements for operation
• Operation is only allowed within the limits specified in the data sheets. This applies
to both the external safety relay and the device.
• To achieve performance level d, the STO function must be checked at least once a
year. Depending on the process, the performance level can also be checked each
time the machine/system is switched on.
3.3 Connection variants
3.3.1 Basic considerations
• For group disconnection, several devices can be provided with 24 V by a single
safety relay. The maximum number "n" of devices results from the maximum per-
mitted contact rating of the safety relay and the maximum permitted voltage drop
of the DC 24 V supply for these devices.
• Other requirements of the safety relay manufacturer (such as protecting the output
contacts against welding) must be strictly observed. The basic conditions de-
scribed in the conditions of the certification report for the device also applies to
cable routing.
• For EMC reasons, the maximum cable length is limited to 30 m. Other instructions
published by the manufacturer on the use of safety relays for specific applications
must also be observed.
• A calculation based on the technical data for the device must be performed separ-
ately for each group disconnection.
3.3.2 Determining the maximum number of devices for group disconnection:
The number "n" of devices that can be disconnected as a group is limited by the fol-
lowing factors:
Switching capacity of the safety relay
A fuse must be connected before the safety contacts according to the specifications of
the safety relay manufacturer to prevent contact welding.
23576855/EN – 10/2017