PACMotion™ PSD
Installation and User Manual
Section 4
GFK-3168A
September 2020
Technical Description and Data
37
CAUTION
High electrical voltage!
Risk of electrical shock! The STO function does not provide an electrical separation from the power
output. If access to the motor power terminals is necessary, disconnect the drive from mains
supply, consider the discharging time of the DC-Bus link.
Note:
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. The monitoring can be used to prevent a faulty output from unintentionally activating
the STO function. If the STO function is a single-channel system, erroneous engaging will not be
recognized.
Note: It is not possible to perform a controlled brake if the drive controlled STO-Enable is off. If
controlled braking before the use of the STO function is necessary, the drive must be braked and
the input STO must be separated time-delayed from +24 V .
Note: In case of a specific double fault within a very short time (
# 54) a single movement of a
maximum angle of 120° (electrical) can happen. This effect can only happen if the drive is in the
function STO. Even if the STO function will be issued for a whole year, this event will only happen
every 100 Billion years.
4.16.4
Use as directed
The STO function is exclusively intended to provide a functional safe stop of the motion system. To
achieve this functional safety, the wiring of the safety circuits must meet the safety requirements of
IEC 60204, ISO 12100 and ISO 13849.
Note: Use the following functional sequence when the STO function is used:
1.
Decelerate the axis in a controlled manner (speed setpoint = 0 V, controlled stop command
via digital input or fieldbus).
2.
When speed = 0 rpm, disable the drive (enable = 0 V).
3.
If a suspended load is present, block the drive mechanically.
4.
Activate the STO function.
4.16.5
Prohibited use
The STO function must not be used if the drive is to be made inactive for:
•
Cleaning, maintenance and repair operations, long inoperative periods. In such cases, the
entire system should be disconnected from the supply and secured (main switch).
•
Emergency-Off situations. In an Emergency-Off situation, the main contactor is switched
off (by the Emergency-Off button).
