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Technical description
6.9.2
Safety notes
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,
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Serious injury could result when a suspended load is not properly blocked. The servo
amplifier cannot hold a vertical load when STO is active.
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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.
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NOTICE
In case of single channel control:
If the STO is automatically activated by a control system, then make sure that the output
of the control is supervised for possible malfunction. This can be used to prevent a faulty
output from unintentionally activating the function STO. Since STO is used in a sin-
gle-channel system, erroneous engaging will not be recognized.
NOTICE
Controlled braking:
Keep to the following functional sequence when 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 STO (STO1-Enable and STO2-Enable = 0V
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WARNING
High electrical voltage!
the S748/772 must be disconnected from mains supply,
consider the discharging time of the intermediate circuit.
WARNING
No Brake Power!
Add a safe mechanical blocking (for instance, a motor-holding brake).
CAUTION
Uncontrolled movement!
Brake the drive in a controlled way first and then separate the STO inputs from +24
VDC time-delayed.
11/2018
S748-S772 Instructions Manual
Kollmorgen
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