Danfoss VLT HVAC Drive FC 100 Series Design Manual page 49

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VLT HVAC Drive Design Guide
2.14.2. Safe Stop Installation
To carry out an installation of a Category 0 Stop (EN60204) in conformity with Safety Category 3 (EN954-1), follow these instructions:
1. The bridge (jumper) between Terminal 37 and 24 V DC must be removed. Cutting or breaking the jumper is not sufficient. Remove it entirely
to avoid short-circuiting. See jumper on illustration.
2. Connect terminal 37 to 24 V DC by a short-circuit protected cable. The 24 V DC voltage supply must be interruptible by an EN954-1 Category 3
circuit interrupt device. If the interrupt device and the frequency converter are placed in the same installation panel, you can use an unscreened
cable instead of a screened one.
MG.11.B7.02 - VLT ® is a registered Danfoss trademark
2. Introduction to VLT HVAC Drive
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