Avoid Unintended Start; Safe Stop Installation - Danfoss VLT AQUA High Power Operation Instructions Manual

VLT AQUA High Power Operation Instructions
2.1.5 Caution
The frequency converter's DC link capacitors remain charged after power has been disconnected. To avoid an electrical shock hazard,
disconnect the frequency converter from the mains before carrying out maintenance. Before doing service on the frequency converter,
wait at least the amount of time indicated below:
Voltage
380 - 480 V
525 - 690 V
Be aware that there may be high voltage on the DC link even when the LEDs are turned off.

2.1.6 Avoid unintended start

While the frequency converter is connected to mains, the motor can be started/stopped using digital commands, bus commands,
references or via the Local Control Panel.
• Disconnect the frequency converter from mains whenever personal safety considerations make it necessary to avoid unintended start.
• To avoid unintended start, always activate the [OFF] key before changing parameters.
• Unless terminal 37 is turned off, an electronic fault, temporary overload, a fault in the mains supply, or lost motor connection may cause a
stopped motor to start.

2.1.7 Safe Stop Installation

To carry out an installation of a Category 0 Stop (EN60204) in
conformity with Safety Category 3 (EN954-1), follow these in-
structions:
1. The bridge (jumper) between Terminal 37 and 24 V DC must be
removed. Cutting or breaking the jumper is not sufficient. Re-
move it entirely to avoid short-circuiting. See jumper on illus-
tration.
2. Connect terminal 37 to 24 V DC by a short-circuit protected ca-
ble. The 24 V DC voltage supply must be interruptible by an
EN954-1 Category 3 circuit interrupt device. If the interrupt de-
vice and the frequency converter are placed in the same instal-
lation panel, you can use an unscreened cable instead of a
screened one.
The illustration below 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.
Power size
110 - 250 kW
315 - 1000 kW
45 - 400 kW
450- 1200 kW
Illustration 2.1: Bridge jumper between terminal 37 and 24
VDC
®
MG.20.P3.02 - VLT is a registered Danfoss trademark
2 Safety
Min. Waiting Time
20 minutes
40 minutes
20 minutes
30 minutes
2
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