Thermistor function (ATEX) vacon • 41
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
8
8. 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 OPTBJ board also contains the Safe Torque Off (STO) safety function. When STO is not
intended to be used, inputs STO1+
(OPTBJ:1), STO2+(OPTBJ:3) are to be connected to +24V (for ex-
ample, pin 6 in VACON
®
100 family control board). STO1-(OPTBJ:2). STO2- (OPTBJ:4) are to be con-
nected to GND (for example, pin 7 or 13 on VACON
®
100 family control board).
NOTE! Safety devices like the OPTBJ board must be correctly incorporated into the entire system.
The functionality of the OPTBJ board is not necessarily suitable for all systems. The entire system
must be designed in compliance with all relevant standards within the field of industry.
NOTE!
The 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. For example, in the
Exe- and ExnA- motors, the PTC sensors must be certified together with the motor according to the require-
ments of the type of protection. The allowed ambient temperature range for the drive is -10ºC…+50ºC.
0537 II (2) GD
CAUTION! The information in this manual provides guidance on the use of therm-
istor function for protecting overheating of motors in explosive atmosphere. How-
ever, 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 OPTBJ
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 OPTBJ board with VACON
®
100 family con-
trol is used to protect the overheating of motors in explosive atmosphere. The
drive itself including OPTBJ board can not be installed in explosive atmosphere.
To Next Page
Loading...
Need help?
General
