CG Emotron OSTO 100, Instruction Manual

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CG Drives & Automation 01-7513-11r0 Functional description 17
The cross circuit is detected by utilizing a staggered test pattern between the two
safety channels (out of sync test pulse).
3.2 STO status feedback signal
In addition to OSSD support, the Emotron OSTO_100 option board also
provides a non-safe ‘STO_STATUS_ISO’ output signal (open collector type,
pulled-up via supply voltage on X2:1) which mirrors the actual status of the gate
driver.
The STO_STATUS_ISO signal is active high, i.e. signal will be high when safe
state (Safe Torque Off active) is reached.
Note that a mismatch between STO1 and STO2 will also activate Safe Torque
Off function as STO_STATUS_ISO mirrors the actual state of the gate driver
NOTE: The receiving unit must support OSSD given the pulse length of the
test pulse and its periodicity. This Emotron OSTO_100 option have support
of OSSD test pulses with a maximum length of 1 ms, with a frequency up to
200 Hz.
NOTE: The status feedback signal is not intended for use of driving external
relay. In the case this is required you may utilize a relay output set to
function ‘STO active’. Detailed description is available in Emotron AC drive
instruction manual. Note that this output is also considered unsafe.
Table 1 Truth table of STO_STATUS_ISO
STO1 STO2 STO_STATUS_ISO Description
HIGH HIGH LOW Drive is active
HIGH LOW HIGH
Safe torque off is acti-
vated (gate driver de-
energized)
LOW HIGH HIGH
LOW LOW HIGH
NOTE: The STO_STATUS_ISO feedback signal may not be used for
cascading.