Example:
Illustration 37: Serial Communication Wiring Diagram
5.11.9 Safe Torque Off (STO) Wiring
The Safe Torque Off (STO) function is a component in a safety control system. STO prevents the unit from generating the voltage
required to rotate the motor. To run the STO function, more wiring for the drive is required. Refer to the VLT
®
FC Series - Safe Torque Off
Operating Guide.
5.11.10 Space Heater Wiring
The space heater is an option used to prevent condensation from forming inside the enclosure when the unit is turned off. It is field
wired and controlled by an HVAC management system.
Specifications:
• Nominal voltage: 100–240
• Wire size: 12–24 AWG (4–0.25 mm
2
)
5.11.11 Auxiliary Contact Wiring for Disconnects
The disconnect is an option that is installed at the factory. The auxiliary contacts, which are signal accessories used with the disconnect,
are not installed at the factory to allow more flexibility during installation. The contacts snap into place without the need for tools.
Contacts must be installed in specific locations on the disconnect depending on their functions. Refer to the datasheet included in the
accessory bag that comes with the drive.
Specifications:
Electrical Installation
Operating Guide | VLT® Refrigeration Drive FC 103
AQ275652766279en-000101 / 130R0707
62 | Danfoss A/S © 2020.01
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