Moog DM2020 Series User Manual

2.6 STO Safety Feature
2.6.1 Descri
ption
The
D
M
2020
drives
include
the
STO
(Safe
Torque
Off)
function
as
a
standard feature to ensure
p
r
o
t
e
ction for personnel and equipment against accidental restart and re-enabling of the drive.
The STO function acts as an interlock against accidental motor rotations.
The STO function can be used as a power turn-off command to prevent accidental starts.
The function disables the power control voltage of the semiconductors of the converter output stage,
preventing the drive from generating the voltage required to rotate the motor.
Using this feature, you can perform short-term operations and/or maintenance work only on non-
electrical parts of the machine without switching off the mains. This function must be enabled from a
safe external control (mechanical or semiconductor) or by a specific external security board.
2.6.2 Directives on Safety
WARNING: Electrical hazard - AVERTISSEMENT: risque électrique
High voltage may be present, which can result in death or serious injury to
personnel, or damage to equipment.
Ø Follow these safety instructions.
WARNING: Mechanical hazard - AVERTISSEMENT: risque mécanique
Large motors can generate very high torque and impact or trapping hazards, which
can result in death or serious injury to personnel, or damage to equipment.
Ø Follow these safety instructions.
Suspended loads must always be securely mechanically locked. The STO function, if activated, does
not ensure against movement of suspended loads.
The interruption of the 24 VDC supply of the STO circuit causes an uncontrolled arrest of the motor.
The STO function does not guarantee an electrical disconnection from the power output to the motor. If
the motor power cable requires service, always disconnect and lock out the mains power supply, wait
for eight minutes for the complete discharge of the intermediate circuit, and then check for residual
voltages at any contact point.
When using the STO function, it is necessary to perform the following sequence of operations.
1.
Stop the movement in a controlled manner, placing the nominal speed value to zero.
2.
Upon reaching the zero speed, and in the case of suspended loads, mechanically lock the load.
3.
Disable the drive and at this point turn on the STO function via supply command
PN: L-MAM2-E-201
Moog Casella DM2020 Installation and Startup Guide
2.6 STO Safety Feature
18

Moog DM2020 Series Specifications

General

Brand	Moog
Model	DM2020 Series
Category	DC Drives
Language	English