Danfoss VLT AQUA Drive FC 202 Instruction Manual page 13

Introduction
Safe Stop Installation and Set-up
WARNING
SAFE STOP FUNCTION!
The safe stop function does NOT isolate AC line voltage to
the adjustable frequency drive or auxiliary circuits. Perform
work on electrical parts of the adjustable frequency drive
or the motor only after isolating the AC line voltage supply
and waiting the length of time specified in Table 1.1.
Failure to isolate the AC line voltage supply from the unit
and waiting the time specified could result in death or
serious injury.
•
It is not recommended to stop the adjustable
frequency drive by using the Safe Torque Off
function. If a running adjustable frequency drive
is stopped by using the function, the unit trips
and stops by coasting. If unacceptable or
dangerous, use another stopping mode to stop
the adjustable frequency drive and machinery,
before using this function. Depending on the
application, a mechanical brake can be required.
•
For synchronous and permanent magnet motor
adjustable frequency drives, in a multiple IGBT
power semiconductor failure: In spite of the
activation of the Safe Torque Off function, the
system can produce an alignment torque which
maximally rotates the motor shaft by 180/p
degrees. p denotes the pole pair number.
•
This function is suitable for performing
mechanical work on the system or affected area
of a machine only. It does not provide electrical
safety. Do not use this function as a control for
starting and/or stopping the adjustable frequency
drive.
Follow these steps to perform a safe installation of the
adjustable frequency drive:
1. Remove the jumper wire between control
terminals 37 and 12 or 13. Cutting or breaking
the jumper is not sufficient to avoid short-
circuiting. (See jumper on Figure 1.4.)
2. Connect an external Safety monitoring relay via a
NO safety function to terminal 37 (safe stop) and
either terminal 12 or 13 (24 V DC). Follow the
instructions for the safety device. The Safety
monitoring relay must comply with Category
3 /PL "d" (ISO 13849-1) or SIL 2 (EN 62061).
®
VLT AQUA Drive
Instruction Manual
Figure 1.4 Jumper between Terminal
12/13 (24 V) and 37
Figure 1.5 Installation to Achieve a Stopping Category
0 (EN 60204-1) with Cat. 3 /PL "d" (ISO
13849-1) or SIL 2 (EN 62061).
1
2
3
4
5
Table 1.5 Legend to Figure 1.5
®
MG20M922 - VLT is a registered Danfoss trademark
1
12
37
5
Adjustable frequency drive
[Reset] key
Safety relay (cat. 3, PL d or SIL2
Emergency stop button
Short-circuit protected cable (if not inside installation IP54
cabinet)
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2
3
4
1-7
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