ATEX - VISBrake

by Coel Motori S.r.l.

General information

The spring-applied brake VIS is a single-disk brake with two friction surfaces. The compression springs create the braking torque by friction locking. The brake is released electromagnetically. The spring-applied brake is designed for the conversion of mechanical work and kinetic energy in heating. For operation characteristics see related paragraph.

Features

  • Modular
  • ATEX Certified Zones 1,2,21,22, Group I M2
  • From 5 to 2000 Nm
  • IP66
  • Patent pending design
  • Heavy duty design

Main Characteristics and Standards

The VIS Series brake are a Patented (pending) design and concept system for quick and easy installation with only 4 bolts.  No machining, fitting and redesign of existing motor required, regardless of manufacturer.  The VIS Series brakes are designed following the ATEX directive ATEX 94/9/CE-ATEX 95, Group II, 2GD category, in compliance with the norms norme EN 60079-0:2006, EN 60079-1:2004, EN 61241-0:2006 and EN 61241-0:2004.  VIS brakes are certified with certificate INERIS 06 ATEX 0047 with addition 01 and 02.

VIS brakes ATEX approved are available in the following versions:

Category 2G / 2D / 2GD
Protection Type EX d / EX tD A21
Enclosure Group IIB / IIC
Temperature Class T3 / T4 / T5
Max Surface Termperature T200 °C / T135 °C / T100 °C
Protection Class IP66
Ambient Temperature -50 °C, +55 °C (available as option on frames 63 to 225)
or
-20 °C, +55 °C (standard for frames 63 to 280)

Manual release

The manual release is an option available, it gives the possibility to release the brake in absence of current. It is a mechanical lever mounted on 2 fulcrums points moving the mobile anchor.

Note: Manual release not applicable for frames 250 and 280

Microswitch

The VIS brakes can be equipped with a microswitch for air-gap or wear monitoring or for hand relase opening monitoring. The user must provide the corresponding electrical connection.

Thermistors

All the VIS brakes are equipped with a PTO thermal protection with temperature limit related to the temperature class of the brake required. It must always be connected when operating in order to prevent extra heating in hazardous areas. In alternative, we can apply a PTC thermistor to have a constant monitoring of the brake temperature through an external PLC.

General Performance Data

TYPE VISVA (AC 3ph)W (DC)Nm MaxNm MedNm Min
63/71 NA 40 8 9 3
90/90 100 50 22 18 12
100 240 115 40 30 20
112 240 115 60 40 30
132 320 140 150 100 70
160 320 140 180 120 100
180 NA 155 335 250 180
200/225 NA 155 460 390 300
250 NA 210 1000 / 700
280 NA 210 1200* / 800
*2000 Nm available in S2 30 min. or S3 40% duty for T4 and T5 temperature class, S1 for T3 temperature class
W - VA = input power
Nm Max = maximum brake moment
Nm Med = medium brake moment
Nm Min = minimum brake moment

Note: special torque values between maximum and minimum values are available on request.

Operating Time

FrameEngagement Time (ms)Braking Time (ms)
AC 3 PH. TypeDC TypeDC BrakeAC3 Phase
DC SwitchingAC Switching
71 / 12 20 120 /
80-90 18 20* 40 240 8
100-112 18 25* 90 540 9
132-160 23 30* 180 1080 12
180-225 / 90* 230 2300 /
250-280 / 160* 360 3800 /
* Value obtained with rectifier type WR2008/2

The VIS Brakes can be AC three phase (frame 80 to 160 only) or DC supplied with rectifier (standard for frames 63,71, 180, 200, 225, 250, 280 option on frames 80 to 160).

When choosing the VIS brakes, please consider the operating times as relevant parameter in the brake choice.

Speed and Torque

FrameMaximum SpeedStarts / Hour Max
Duty S1Duty S3 40%Dynamic*
71 3600 4320 1800
80-90 3600 4320 1800
100-112 3600 4000 1300
132-160 3600 4000 900
180-225 2800 3600 600
250-280 1800 2200 600
* Values are calculated in dynamic application with an inertia applied to the brake so to create a sliding of the disk of 0,5 seconds maximum. In case of longer time of sliding of the disk calculation, please contact us.

The VIS brakes are designed to operate in heavy duty condition.

Using the VIS brake, pay attention to the values of maximum speed allowed, duty cycles and brake torque in relation to the inertia applied.

Options

  • Hand release (not available for frames 250 and 280)
  • Ready for hand release kit
  • PTC thermistors
  • Anti condensation heaters
  • Switch on brake opening or on hand release
  • Special flange coupling 
 

Certified: NEC 500, ATEX, IECeX, INMETRO