SEW-Eurodrive MOVIPRO PHE Series, Руководство по эксплуатации, Страница: 20 / 100

3
Functional safety
Safety requirements
Operating Instructions – MOVIPRO
®
PHE..B-A15-.1X0..B-00
20
• When planning the installation, observe the technical data of the device.
• The IP 54 degree of protection must be preserved. This is only achieved if non-
used connectors and covers are properly closed.
3.2.4 Requirements for the external safety controller
A safety relay can be used as an alternative to a safety controller. Observe the follow-
ing requirements.
• For safety-relevant applications up to performance level d to EN ISO 13849-1, the
safety controller and all other safety-relevant subsystems must be approved for at
least performance level d to EN ISO 13849-1 or SIL 2 to EN 61508. For determin-
ing the performance level of the overall application, you can use the method de-
scribed in EN ISO 13849-1 for combining several safety-relevant subsystems
without PFH value calculation. SEW‑EURODRIVE recommends to determine the
PFH value for the overall application. For the PFHd value for the device, refer to
chapter "Technical data" (→
2 82).
• For safety-related applications up to SIL 2 according to EN 62061, the safety con-
troller and all other safety-relevant subsystems must be approved for at least SIL 2
to EN 61508 or performance level d to EN ISO 13849‑1. The probability of a dan-
gerous failure per hour (PFHd value) must also be determined. The PFH value of
the device is to be used to determine the PFHd value for the overall application.
Application Safety controller requirements
Performance Level d accord-
ing to EN ISO 13849-1
Performance Level d according to EN ISO 13849-1
SIL 2 according to EN 61508
SIL 2 according to EN 62061 Performance Level d according to EN ISO 13849-1
SIL 2 according to EN 61508
• The wiring with the external safety controller must be suitable for the required
safety class, (see manufacturer documentation). Safety circuits require 2-pole dis-
connection.
• The values specified for the safety controller must be strictly adhered to when
designing the circuit.
• The switching capacity of the safety relays or the relay outputs of the safety con-
troller must correspond at least to the maximally permitted, limited output current
of the 24 V voltage supply.
Observe the manufacturer's instructions concerning the permitted contact loads
and fusing that may be required for the safety contacts. If the manufacturer
provides no specific information, the contacts must be protected with 0.6 times the
nominal value of the maximum contact rating specified by the manufacturer.
• To ensure protection against unintended restart in accordance with EN 1037, the
safety controllers must be designed and connected in such a way that resetting the
control device alone does not lead to a restart. A restart may only be carried out
after a manual reset of the safety circuit.
23576855/EN – 10/2017