Kollmorgen S700

5.9.4 Important notes
WARNING
The function STO does not provide an electrical separation from the
power output. Risk of electric shock! If access to the motor power
terminals is necessary, the S700 must be disconnected from mains
supply considering the discharging time of the intermediate circuit.
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
single-channel system, erroneous engaging will not be recognized.
Controlled braking
When 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. Risk from
uncontrolled movement!
If a controlled braking before the use of STO is necessary, the drive must be braked and
the inputs STO1-ENABLE and STO2-Enable have to be separated from +24 VDC
time-delayed.
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)
5.9.5 Use as directed STO
The STO function is exclusively intended to provide functional safety, by preventing the
restart of a system. To achieve this functional safety, the wiring of the safety circuits must
meet the safety requirements of IEC 60204, ISO 12100, IEC 62061 respectively ISO
13849-1.
In case of single channel control: if STO is automatically activated by a control system,
then make sure that the output of the control is monitored for possible malfunction.
To achieve PL e or SIL CL3, the safe switching of the pulse inhibitor must be tested peri-
odically by analyzing the feedback signal from the safety control (ð p. 50).
5.9.6 Prohibited Use STO
The STO function must not be used if the drive is to be made inactive for the following
reasons :
1. Cleaning, maintenance and repair operations, long inoperative periods:
In such cases, the entire system should be disconnected from the supply by the
personnel, and secured (main switch).
2. Emergency-Off situations: the mains contactor must be switched off (by the
emergency-Off button).
42 S701x2-S724x2 Instructions Manual
Technical description 07/2014 Kollmorgen