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3 Safety Module
The F6 Elevator Drive contains a SIL3 rated Safety Module Type 5 as standard
hardware. Various safety functions are defined in the standard EN 61800-5-2. These
functions have been evaluated by the independent compliance and certification body
TUV Rheinland. Safety Module Type 5 EC Type-Examination Certificate can be found in
the Appendix, pg. 299.
Safe Torque Off (STO) is a safety function which prevents the creation of a rotational
torque on the shaft of an AC motor. The power modules of the drive are switched off via
two dual channel STO inputs. For functional safety applications, each channel of each
input, must be driven by an independent signal. STO must be released by active input
signals in order for the drive to provide current to the motor.
Safe Torque Off
The drive is switched off by the two-channel
switching off of commutation of the power
semiconductors. After triggering of the
function, the drive coasts down. The drive
reaches the stop postion depending on the
speed and the active torque.
Safe Brake Control (SBC) is a safety function which is used to release the brake output in
order to actively control the brake contactor. The SBC safety function checks the
functionality of the brake output hardware and will trigger a critical fault if a defect in the
hardware is detected. Once the brake output is released, the normal software within the
drive is able to activate the brake output based on the actual status of the control
sequence. The SBC function is released by active input signals at the SBC input.
Safe Brake Control
This function provides safe output signals to
control up to two external brakes.
3.1 Delivered Configuration
The safety module is preconfigured at the factory to provide the following functions. One
dual channel input for STO and one dual channel input for STO and SBC. One single
channel output to confirm STO and one single channel output to confirm SBC. Changes
to the configuration of the safety module are not covered by the scope of this manual. For
further information, contact KEB.
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