6.9.2 Safety notes
WARNING
High electrical voltage!
Risk of electric shock! The function STO does not provide an electrical
separation from the power output. If access to the motor power terminals
is necessary,
l
disconnect the S300 from mains supply,
l
consider the discharging time of the intermediate circuit.
WARNING
No Brake Power!
Serious injury could result when a suspended load is not properly
blocked. The servo amplifier cannot hold a vertical load when STO is
active.
l
Add a safe mechanical blocking (for instance, a motor-holding brake).
CAUTION
Uncontrolled movement!
Danger of personal injury. If STO is engaged during operation by
separating input STO1-Enable and STO2-Enable from 24 VDC, the motor
runs down out of control and the servo amplifier displays the error F27.
There is no possibility of braking the drive controlled.
l
brake the drive in a controlled way and separate the STO inputs from
+24 VDC time-delayed.
In case of single channel control:
If the safety function STO is automatically activated by a control system, then make sure
that the output of the control is monitored for possible malfunction. This can be used to
prevent a faulty output from unintentionally activating the safety function STO. Since the
restart lock is a single-channel system, erroneous engaging will not be recognized.
Controlled braking:
Keep to the following functional sequence when the restart lock STO is used :
1. Brake the drive in a controlled manner (speed setpoint = 0V)
2. When speed = 0 rpm, disable the servo amplifier (enable = 0V)
3. If there is a suspended load, block the drive mechanically
4. Activate the restart lock STO
38 S300 Instructions Manual
Technical description 02/2017 Kollmorgen
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