Safety Notes - Kollmorgen S700 Series Instruction Manual

S748-772 Instructions Manual | 7 Technical description

7.9.2 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,
Serious injury could result when a suspended load is not properly blocked. The servo amp-
lifier cannot hold a vertical load when STO is active.
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.
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 out-
put from unintentionally activating the function STO. Since STO is used in a single- channel
system, erroneous engaging will not be recognized.
Controlled braking:
Keep to the following functional sequence when the drive must be braked in a controlled
manner:
1. Brake the drive in a controlled manner (velocity 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)
42 Kollmorgen | kdn.kollmorgen.com | July 2019
High electrical voltage!
disconnect the servo amplifier from mains supply,
consider the discharging time of the intermediate circuit.
No Brake Power!
Add a safe mechanical blocking (for instance, a motor-holding brake).
Uncontrolled movement!
Brake the drive in a controlled way first and then separate the STO inputs from +24VDC
time-delayed.