Jumper Terminals 12 And - Danfoss VLT FC 103 Instruction Manual

Installation
STO installation and set-up
WARNING
STO FUNCTION!
The STO 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 and
waiting the length of time specified in chapter 1 Safety.
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 will trip
and stop by coasting. If this is not acceptable,
e.g., causes danger, the adjustable frequency
drive and machinery must be stopped using the
appropriate stopping mode before using this
function. Depending on the application, a
mechanical brake may be required.
•
Concerning synchronous and permanent magnet
motor adjustable frequency drives in case of a
multiple IGBT power semiconductor failure: In
spite of the activation of the Safe Torque Off
function, the adjustable frequency drive 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 adjustable frequency
drive system or affected area of a machine only.
It does not provide electrical safety. This function
should not be used as a control for starting
and/or stopping the adjustable frequency drive.
MG16E222
Instruction Manual
The following requirements have to be met to perform a
safe installation of the adjustable frequency drive:
1.
2.
Figure 2.36 Jumper between Terminal 12/13 (24 V) and 37
Danfoss A/S © Rev. 2014-02-10 All rights reserved.
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 in Figure 2.36).
Connect an external safety monitoring relay via a
NO safety function (the instruction for the safety
device must be followed) to terminal 37 (STO)
and either terminal 12 or 13 (24 V DC). The safety
monitoring relay must comply with Category 3
(EN 954-1) / PL "d" (ISO 13849-1).
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