Danfoss VLT HVAC Design Manual page 17

Introduction to VLT® HVAC D...
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2.6.2 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
24V DC must be removed. Cutting or breaking
the jumper is not sufficient. Remove it entirely to
avoid short-circuiting. See jumper
inIllustration 2.2.
2. Connect terminal 37 to 24V DC by a short-circuit
protected cable. The 24V 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.
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VLT HVAC Drive Design Guide
Illustration 2.2 Bridge jumper between terminal 37 and 24V DC
Illustration 2.3 shows a Stopping Category 0 (EN 60204-1)
with safety Category 3 (EN 954-1). The circuit interrupt is
caused by an opening door contact. The illustration also
shows how to connect a non-safety related hardware
coast.
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MG11BB02 - VLT is a registered Danfoss trademark