3
BML-S1G0-_7_ _-M5E_-_0-_ _
Absolute Magnetically Coded Position Measuring System
Cable routing
Do not route the cable between the position measuring
system, controller, and power supply near high voltage
cables (inductive stray noise is possible).
The cable must be routed tension-free.
Bending radius for fixed cable
The bending radius for a fixed cable must be at least 7.5
times the cable diameter; with moved routing, it must be
15 times the diameter.
Cable length
Max. cable length 20 m. Longer cables may be used if
their construction, shielding and routing prevent noise
interference.
Startup
DANGER
Uncontrolled system movement
When starting up, if the linear encoder system is part of a
closed loop system whose parameters have not yet been
set, the system may perform uncontrolled movements.
This could result in personal injury and equipment
damage.
►
Persons must keep away from the system’s
hazardous zones.
►
Startup must be performed only by trained technical
personnel.
►
Observe the safety instructions of the equipment or
system manufacturer.
1.
Check connections for tightness and correct polarity.
Replace damaged connections or devices.
2.
Turn on the system.
3.
Check measured values in the controller and reset if
necessary.
The BML is an absolute measuring system.
When the supply voltage is switched on, the
absolute position is immediately available
without the need for a reference run. The sensor
head may not be removed from and replaced
on the magnetic tape during operation. If the
sensor head is returned, a valid signal is not
output until a movement of approx. 30 mm in
direction X has occurred or after 2 seconds.
Leaving and approaching the magnetic tape in
the direction of travel is, however, permissible.
Preset
The magnetic tape has an absolute coding over 48 m.
For shorter travel lengths the position of the sensor head
can be permanently set at the start value of 10 mm at any
desired position (Preset). This is recommended especially
for SSI interfaces with a low bit count. To do so, a voltage
between 5 V and 28 V is applied to the line of pin 11,
GY PK for > 0.5 s. The current position is then 10±1 mm.
Construction and function (continued)
Shielding and cable routing (continued)
Nr
. 894609 EN
.
K19; subject to modification. Replaces E19.
Insulator BAM TO-ML-014-01
(Not included in scope of delivery, accessories,
order code: BAM02YC)
With increased EMC requirements, the sensor head can
be assembled in a way to insulate it completely from the
machine using two insulators. This requires two M3
threaded holes on the machine part.
►
Insert the two insulators into the 4.3 mm holes on the
sensor head to the left and right.
Assembling the sensor head
►
Fasten the right or left side of the sensor head to the
machine part whose position is to be determined.
To function correctly, the bottom of the sensor
head must always be above the magnetic tape
(see distances and angles).
Assembling the magnetic tape
NOTICE!
Damage to the magnetic tape
Hard tools may cause damage to the magnetic surface
of the tape. Even damage that appears slight (e.g.
scratches, dents) can affect the function and linearity.
►
Do not use hard tools to install the magnetic tape!
►
Replace damaged magnetic tapes.
For a complete technical description and
assembly instructions for magnetic tapes,
please see the magnetic tape user’s guide in
the Internet at
www.balluff.com
.
Magnetic tapes with an adhesive layer can be
attached using an installation aid (accessory)
(see user’s guide).
Shielding and cable routing
Defined ground!
The linear encoder system and the control
cabinet must be at the same ground potential.
Shielding
To ensure electromagnetic compatibility (EMC), observe
the following:
– The cable shield must be grounded on the controller
side, e.g. connected to the protective earth conductor.
– When ducting the cable between the sensor, controller,
and power supply, it is important to avoid going near
high voltage cables due to interferences.
Stray noise from AC harmonics (e.g. from phase angle
controls or frequency converters) are especially critical
and the cable shield offers very little protection against
this.
Magnetic fields
The position measuring system is a magnetically coded
system. It is important to maintain adequate distance
between the position measuring system and strong,
external magnetic fields.
english
www.balluff.com
