TITAN GO Product Manual |
Wiring and Connections
INGENIA | 2022-07-14 08:35:14
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7.9 Safe Torque Off (STO)
The STO is a hardware safety system that prevents motor torque in an emergency event
. When STO is
activated, the power stage is disabled automatically (no mater what control or firmware does), and the motor shaft
will slow down until it stops under its own inertia and frictional forces.
The Titan Go STO works with negative logic, deactivating the power stage by default.
In order to activate the
power stage
, and therefore allow the motor operation,
two differential inputs must energized
. These inputs
activate two optocouplers that enable the Titan Go power stage operation. On the contrary,
if the STO inputs are
not energized, the transistors of the power stage are turned off
and a STO fault is notified. During this state, no
torque will be applied to the motor no matter configuration, or state of a command source. This will slow down the
motor shaft until it stops under its own inertia and frictional forces. This input should not be confused with a digital
input configured as enable input, because enable input is firmware controlled and does not guarantee intrinsic
safety as it can be reconfigured by a user.
The following diagram shows a simplified schematic of the STO circuit.
The Titan Go STO have been designed to be compliant with Safety Integrity Level 3 (SIL 3) according to IEC
61800-5-2. In order to fulfill the requirements, the STO reliability has been increased by means of the following
charateristics:
Two fully independent STO channels
STO Feedback output for external diagnostics
Detection of abnormal STO operation
Do not leave STO unconnected
If STO is not used, both inputs STO1 and STO2 must be enabled. Otherwise it will be impossible to apply
torque to the motor.
Tip: In order to enable the inputs it is suggested to connect STO_COMMON to GND of
and
connect both STO1 and STO2 to 24V_OUT of connector P1.
Summary of Contents for Titan GO
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