8.6 Installation
Safety relays that have a plus and minus switching output signal can be directly connected to the servo system to activate STO.
The example in
not supplied by Danfoss. The STO is activated by opening STO+ and STO–.
Table 29: Activation of STO Function
STO+
STO–
STO function
24 V
GND
STO deactivated
Open
GND
STO activated
24 V
Open
STO activated
Open
Open
STO activated
CAUTION
-
Do not exceed 30 V at the STO inputs.
-
STO is activated if the plus input is between –3 V and +3 V.
-
STO is deactivated if the plus input is b21.6 V and +26.4 V.
Illustration 113: Safety Relay with Plus and Minus Switching Output
Signals with test pulses must not have test pulses of >1 ms. Longer pulses may lead to reduced availability of the servo system.
8.6.1 Protective Measures
•
Install the MSD 510 system components in a cabinet that is rated at least IP54 as per IEC 60529 or in an equivalent environment. A
higher IP protection may be necessary for certain applications.
•
If external influences can affect the motor axis, for example suspended loads, use additional measures, such as a safety holding
brake, to eliminate hazards.
8.7 Application Example
An example of an application that can be put in Safe Torque Off mode by a safety circuit is shown in
.
Select the safety switch devices in accordance with the requirements of the application.
Functional Safety Concept
Operating Guide | VLT® Multiaxis Servo Drive MSD 510 System
AQ262450196490en-000101 / 175R1170
156 | Danfoss A/S © 2019.10
Summary of Contents for VLT MSD 510
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