Startup; Starting Up The System; Preset; Check System Function - Balluff BML-S1G0-7-M5E-0 Serie Manual De Instrucciones

BML-S1G0-_7_ _-M5E_-_0-_ _
Absolute Magnetically Coded Position Measuring System
5

Startup

5.1

Starting up the system

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.
For ring applications note that the measured
angle position is ambiguous (e.g. an angle of
+350° is also equivalent to –10°). However, after
a power on, the position is always displayed
positive.
The sensor head must be calibrated to the
magnet ring using the BML Configuration Tool
(see Accessories on page 30).
SSI/BiSS C interface
Only send clock impulses if there is power in the
position measuring system.
5.2

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.
If the sensor head is moved backwards more than 10 mm,
the position decreases to zero and then becomes negative
(two's complement). If these values are not useful to the
controller, the Preset function has to be used at the
beginning of the range of movement. The transmitted
position can never be negative then. If the magnetic tape is
exchanged, the Preset function must be repeated at the
start position. The BML Configuration Tool (see
section 10.5) can be used to carry out the Function Preset
at any desired position value.
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5.3

Check system function

Check all functions as follows after assembling the linear
encoder system or exchanging the sensor head:
1. Switch on the sensor supply voltage.
2. Evaluate the position data.
3. Move the sensor head along the entire measuring
range. Heed the error and warning bits in the data set
as well as the LED errors and warning sequences.
4. Check that the count direction of all interfaces
(SSI/BiSS 1 Vpp or A/B) corresponds with the direction
of travel.
5.4

Operating notes

– Check and record the function of the linear encoder
system and all associated components on a regular
basis.
– If there are malfunctions in the linear encoder system,
take it out of service and secure it against unauthorized
operation (see also Troubleshooting on page 32).
– Secure the system against unauthorized use.
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 in direction Z or Y
from and replaced on the magnetic tape during
operation. An error message is output
immediately if lifted. 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 with a speed of 1 mm/s to 10 m/s is,
however, permissible, where the maximum
speed depends on the resolution or edge
separation (see Tab. 6-4 on page 16 and
Tab. 6-13 on page 19). After the active
surface is located above the measuring tape,
the error signal disappears after 2 ms and a
valid position value is output.
In the document Interfaces for BML
Magnetically Coded Position Measuring
System (Doc. No. 929191) there is a checklist
for all relevant activities related to installation
and service.
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