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Appendix
CG Drives & Automation 01-7513-11r0
Additionally EN IEC 61800-5-2 describes different safe stop functions,
meaning that the general stop categories described in EN IEC 60204-1 above
are applied with different additional safety functions, for example:
•
Safe Torque Off (STO) is a safety sub-function which prevents force-pro-
ducing power from being provided to the motor. This safety sub-function
corresponds to an uncontrolled stop in accordance with stop category 0 of
EN IEC 60204-1.
•
Safe Stop category 1 which can be specified in three different ways:
•
Safe Stop 1 deceleration controlled (
SS1-d
). This initiates and controls
the motor deceleration rate within selected limits to stop the motor and
performs STO function when the motor speed is below a specified limit.
•
Safe Stop 1 ramp monitored (
SS1-r
). This initiates and monitors the
motor deceleration rate within selected limits to stop the motor and per-
forms the STO function when the motor speed is below a specific limit.
•
Safe Stop 1 time limited (
SS1-t
). This initiates the motor deceleration
and performs the STO function after an application specific time delay.
This safety sub-function corresponds to a controlled stop in accordance
with stop category 1 of EN IEC 60204-1. The working principle is that
e.g. a 2-channel passive emergency switch is connected to a safety
switching device (safety relay, mandatory). When the emergency switch
is activated, the safety relay activates a digital output signal (unsafe) to
signal to the Emotron AC drive to perform stop (braking motor). The
set delay (this is a safe delay function) of the safety relay is counted down
and when reaching zero the STO function is activated by deactivating
the two safety channels from the safety relay to the Emotron
OSTO_100 option. It shall be noted that the actual controlled stop (AC
drive braking of motor) is considered unsafe, therefore SS1-t cannot be
applied to applications where failure of braking function can lead to a
dangerous situation. Instead it is then advisable to use yet another safety
function like Safe Brake Control (
SBC
) which utilizes safe external
brake(s) in addition.
Summary of Contents for Emotron OSTO 100
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