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SE-Power FS STO-manual vers. 1.6 en.12.08.2015
8.3
Replacing the previous series SE-Power with the SE-Power FS
8.3.1
SE-Power
The devices of the previous SE-Power
series have an integrated STO “Safe Torque Off” in
accordance with EN ISO 13849-1, Cat. 3 / PL d. The two-channel arrangement required by
the STO function is achieved via two separate switch-off paths:
1. Switch-off path: Output stage enable via [X1.21], switch-off of the power output phase
(PWM signals disabled). The power semiconductor drivers are no longer activated by
pulse pat-terns.
2. Switch-off path: Power supply to the six output stage power semiconductors IGBTs via
[X3] is interrupted by means of a relay. The driver supply for the power semiconductors
(IGBT optocouplers) is disconnected by means of a relay. This prevents the pulse pattern
(PWM signals) reaching the power semiconductors.
The SE-Power also has a floating feedback contact ([X3] Pins 5 and 6) which, as a
diagnostics output, indicates the presence of the driver supply.
8.3.2
SE-Power FS
Devices of the SE-Power FS series feature, in combination with the SE-Power FS Safety
Module, have the safety function STO “Safe Torque Off” in accordance with EN 61800-5-2
SIL3, and/or EN ISO 13849-1, Cat. 4 / PL e. The two switch-off paths are realised via the
control ports STO-A [X40.1] and STO-B [X40.3]. The potential-free feedback contact ([X40]
Pins 5 and 6) is also present.
8.3.3
Modifications to the connection wiring
Converting an existing application with STO from SE-Power to SE-Power FS requires the
following modifications to be made to the connection wiring:
1. Switch-off-path:
Retain output stage enable wiring [X1.21] and route in parallel to STO-A [X40.1].
Connect GNDA [X40.2] to 0 V [X40.8] to link the reference potential.
2. Switch-off-path:
Now route driver supply wiring [X3.RELAY] to STO-B [X40.3].
Connect GNDB [X40.4] with 0 V [X40.8] to link the reference potential.
Feedback contact:
Relay connection for the feedback contacts [X3.5] and [X3.6] to [X40.5] and [X40.6].
Note
During operation, the feedback contacts on the SE-Power and the SE-Power FS
show compatible behaviour.
When the logic supply (24 V) is switched off, they behave differently:
SE-Power: Contact closed.
SE-Power FS:
Contact open
.