Keba CDF3000, Руководство по эксплуатации

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Operating Instructions CDF3000
3-23
3 Installation
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The "STO" safety function to EN 61800-5-2 describes a safety measure
in the form of an interlocking or controlling function. Category 3 means
that this safety function will remain in place in case a single fault occurs.
The safety-related parts must be designed in such a way that:
• a single fault in any of the said parts does not result in loss of the safety
function and
• whenever feasible in an appropriate manner, the single fault is detected.
For the "STO" function the positioning controllers are equipped with addi-
tional logic circuits and a feedback contact. The logic cuts the power sup-
ply to the pulse amplifiers to activate the power stage. In combination with
the controller enable "ENPO" the system uses two channels to prevent
the motor creating a torque.
This variant offers the following advantages over the solution with a motor
contactor:
• No need for the external motor contactor
• So less wiring
• Space-saving
• Better EMC performance due to the continuous shielding of the motor
cable
• Shorter reaction time
3.10.4 Basic informa-
tion
Always draw up a validation plan. The plan specifies which tests and
analyses were used by you to determine compliance of the solution with
the requirements of the application.
Note:
Cabinet mounting with ingress protection IP54 is essential.
3.10.5 Hazard due to
dangerous
voltage:
• If the positioning controller is in the "STO" state all motor and mains
cables, braking resistors and DC link voltage cables conduct danger-
ous voltages against protective conductors.
• With the "STO" function no "shutdown of voltage in case of emer-
gency" is possible without additional measures. There is no electrical
isolation between the motor and servocontroller! This means there is
a risk of electric shock or other electrical risk.