Jetter JM-35 S1 Series, Manual, Page: 47 / 124

2 Function description
2.1 Introduction
Servo amplifier malfunctions must be detected by the superimposed
monitoring of the movement or by other measures in the application. The
detection and the reaction are the responsibility of the user. The safety
system provides the safety functions STO and SBC that the user can use
as a reaction to servo amplifier malfunctions in the application.
NOTICE
DAMAGE TO THE DEVICE DUE TO INCORRECT IN-
STALLATION
The servo amplifier must be installed in an electric cabinet with degree of
protection IP54.
2.2 STO (Safe Torque Off)
The servo amplifiers support the safety function STO (Safe Torque Off) in
accordance with the requirements of EN 61800-5-2, EN ISO 13849-1
“PL e” and EN 61508 / EN 62061 “SIL 3”. You will find the safety-related
characteristics in chapter „5.4 Safety-related characteristics“. The STO
shutdown takes place within 2.5 ms.
The safety-related parts must be designed such that:
y
a single failure in any of these parts does not result in the loss of the safety
function, and
y
the single failure is detected on or before the next demand upon the safety
function.
For the function STO the servo amplifierss are equipped with additional
logic circuits. The logic interrupts the supply voltage for the pulse amplifier
for the operation of the power stage. By means of two inputs the motor is
prevented from generating torque using a two-channel process.
DANGER! ELECTRICAL HAZARD DUE TO HIGH VOLTAGE
THIS HAZARD WILL RESULT IN DEAD OR SERIOUS INJURY
IF NOT AVOIDED.
ƒ
If the servo amplifier is in the state STO, the motor and mains cable,
braking resistor and DC link cable will carry dangerous voltages in relati-
on to the PE conductor.
ƒ
Without additional measures it is not possible to implement “shutdown of
the power supply in an emergency” using the function STO. There is no
electrical isolation between motor and servo amplifier! As such there is
a risk due to electric shock and other risks of an electrical origin.
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JetMove 3000 Function description