Vacon OPTAF, User Manual

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THERMISTOR FUNCTION (ATEX) vacon • 37
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4. THERMISTOR FUNCTION (ATEX)
The thermistor overtemperature supervision is designed in accordance with ATEX directive 94/9/
EC. It is approved by VTT Finland for group II (certificate nr. VTT 06 ATEX 048X), category (2) in the
G area (area in which potentially explosive gas, vapor, mist or air mixtures are present) and D area
(area with combustible dust). The "X" in the certificate number refers to special conditions for safe
use. See the conditions in the last note in this page.
It can be used as an overtemperature tripping device for motors in explosive area (EX motors).
NOTE! The OPTAF board also contains the Safe Torque Off (STO) safety function. When STO is not
intended to be used, inputs SD1+(OPTAF: 1), SD2+(OPTAF:3) are to be connected to +24 V (e.g. OPT-
A1:6) & SD1-(OPTAF:2). SD2- (OPTAF:4) are to be connected to GND (for e.g. OPT-A1:7).
Note: Changes in this chapter are only allowed with the permission of certification body.
NOTE!
Safety devices like the OPTAF board must be correctly incorporated into the entire
system. The functionality of the OPTAF board is not necessarily suitable for all sys-
tems. The entire system must be designed in compliance with all relevant standards
within the field of industry. Maximum SIL capability of this function in the drive is
SIL1.
CAUTION! The information in this manual provides guidance on the use of thermis-
tor function for protecting overheating of motors in explosive atmosphere. This
information is ensured to be correct and in compliance with accepted practice and
regulations at the time of writing. However, the end product/system designer is
responsible for ensuring that the system is safe and in compliance with relevant
regulations.
CAUTION! During maintenance breaks, or in case of service/repair the OPTAF board
might have to be removed from its slot. After reconnecting the board ALWAYS make
sure that the thermistor function is working correctly by testing it.
CAUTION! The thermistor function on OPTAF board with VACON
®
NXP control is
used to protect the overheating of motors in explosive atmosphere. The drive itself
including OPTAF board can not be installed in explosive atmosphere.
NOTE! Special conditions required for safe use (X in the certificate number):
This function can be used with Exe-, Exd-, and ExnA- type of motors. In case of
Exe-, and ExnA- motors, the end user has to confirm that the installation of the
measurement circuit is done according to area classification. E.g. in Exe- and ExnA-
motors PTC sensors shall be certified together with the motor according to the
requirements of the type of protection.
The allowed ambient temperature range for the drive is -10 ºC…+50 ºC.
0537
II (2) GD
11070.emf