XR4F
1
8 9 0 1 E . P L E A S A N T VA L L E Y R O A D • I N D E P E N D E N C E , O H I O 4 4 1 3 1 - 5 5 0 8
T E L E P H O N E : ( 1 ) 2 1 6 - 6 4 2 - 1 2 3 0 • FA X : ( 1 ) 2 1 6 - 6 4 2 - 6 0 3 7
E - M A I L : t a c h s @ a v t r o n - i a . c o m • W E B : w w w. a v t r o n e n c o d e r s . c o m
Encoder Instructions
XR4F SMARTSafe
™
SOLID SHAFT B10 FLANGE
OR FOOT MOUNT
FOR HAZARDOUS APPLICATIONS
DESCRIPTION
The Avtron Model XR4F, SMARTSafe™ is a
heavy duty
incremental
encoder for hazardous atmosphere applications (also known
as tachometer or rotary pulse generator). Its output is directly
proportional to shaft position (pulse count) or speed (pulse rate). The
XR4F operates down to zero speed and can be used for both control
and instrumentation applications.
CAUTION
The XR4F is designed for use in hazardous applications
which require protection from gas or dust ignition for
safe operation. Proper selection, wiring and installation
procedures are essential to ensuring safe conditions.
The XR4F is designed for mounting on European B10 style flanges
(85mm flange, 100mm bolt circle), or on a foot mount bracket for
coupling. The XR4F is not recommended for pulley or chain drive
applications.
The XR4F utilizes magnetoresistive sensors. This proven technology
is ideal for rugged environments since it is immune to many
contaminants that cause optical encoders to fail. All of the XR4F
electronics are potted, providing full protection against liquids.
The outputs are protected against short circuits and wiring errors.
Each XR4F has a two-phase output (A, B) 90° out of phase, with
complements (A–, B–), (A Quad B Output). A marker pulse with
complement (Z, Z–) is also present.
The XR4F has a diagnostic package that includes Adaptive Electronics
and a Fault-Check output and red/green LED for local indication. With
this package, the XR4F can maintain itself, and provide an alarm if
there is a problem before the problem causes un scheduled downtime.
ADAPTIVE ELECTRONICS
A perfect duty cycle consists of a waveform whose “high” and
“low” conditions are of the same duration (50%/50%). It is possible
over time for the duty cycle and edge separation to change due
to component drift, temperature changes, or mechanical wear.
The Adaptive Electronics extend the life of the XR4F by constantly
monitoring and correcting duty cycle and edge separation over time.
The XR4F has been evaluated to be compliant with IEC60079-0:2007,
IEC60079-11:2011, EN60079-0:2009, EN60079-11:2012,
BSEN 61000-6-4:2007 and BSEN61000-6-2:2005 (Certificates of
conformity: TRAC12ATEX0002X, TRAC12ATEX 0003X, IECEx TRC
12.0009X, and IECEx TRC12.0001X.)
THE XR4F IS CERTIFIED FOR USE IN:
Group II, Category 2 (ATEX Zone 1), Gas Group IIC
potentially
explosive atmospheres when marked CE 0539
Ex
II 2 GD, Ex ib
IIC T4 Gb -40°C < Tamb < 80°C and used with an Avtron isolator
marked CE 0539
Ex
[II 2 GD] [Ex ib IIC Gb] -40°C<Tamb<80°C.
Group II, Category 2 (ATEX Zone 21), Dust Group IIIC
potentially
explosive atmospheres when marked CE 0539
Ex
II 2 GD, Ex ib
IIIC T200°C Db -40°C<Tamb<80°C and used with an Avtron isolator
marked CE 0539
Ex
[II 2 GD] [Ex ib IIIC Db] -40°C<Tamb<80°C .
Group II, Category 3 (ATEX Zone 2), Gas Group II
_* potentially
explosive atmospheres when marked CE
Ex
II 3 GD, Ex ic IIC* Gc
T4 -40°C<Tamb<80°C
*see chart in specification section and used with a power supply
that limits voltage and current per the chart in the specification
section.
Group II, Category 3 (ATEX Zone 22), Dust group IIIC
potentially
explosive atmospheres when marked CE
Ex
II 3 GD, Ex ic IIIC T
200°C Dc -40°C<Tamb<80°C.
See installation section for electrostatic charging hazard instructions
and other limitations.
INSTALLATION
WARNING
Installation should be performed only by qualified
personnel. Safety precautions must be taken to ensure
machinery cannot rotate and all sources of power are
removed during installation.
Equipment Group II, Category 2 (Zone 1), Gas group IIC, Dust
group IIIC (ATEX Zone 21):
Available as a system only including
XR4F with line driver option 5 and an Avtron Isolator module XRB1
(P/N B35134).
System parameters are:
Um= 250V
Uo (open circuit voltage) = 7.14VDC max.
Io (short circuit current) = 420mA max.
Co (system capacitance) = 13.5uF max.
Lo (system inductance) = 0.15mH max.
Encoder parameters are:
Ui (input voltage) = 7.14VDC max.
Ii (fault current) = 420mA max.
Ci (internal capacitance) = 11.9uF max.
Li (internal inductance) = 0mH max.
The isolator XRB1 can be supplied as a separate module for location
in a safe area or in an explosion proof box on a short flexible cable
tethered to the encoder.
Equipment Group II, Category 3 (Zone 2), Gas group IIC, Dust
group IIIC (ATEX Zone 22):
Requires an XR4F with line driver option
7 and a SELV (Energy Limited) or equivalent power supply which limits
voltage and current to the values in the table in the specifications.
If current limit is not inherent in the power supply a separate fuse
between the power supply and encoder can be used to limit current.
