Voltage Drop In The Supply; Shielding And Cable Routing - Balluff BML-S1F-A/Q-M0-0-KA/KD/KF Serie Manual De Instrucciones

BML-S1F_-A/Q _ _ _ -M_ _ 0- _ 0-...
Incremental Magnetic Linear Encoder
4
Installation and connection (continued)
4.4

Voltage drop in the supply

While operating at 5 V, the operating voltage
must be 5 V ±5%. To compensate for voltage
drops in the supply, we recommend using a
regulated power supply with sense input
(Fig. 4-4).
If this is not possible or desired, integrate the
sense lines of the 12-wire cable (not with 8-wire
cable BML-...-KF...) parallel to the +5 V and
GND lines (Fig. 4-5).
Fig. 4-4: Power supply with sense line
Fig. 4-5: 5-V power supply without sense line
14 english
4.5

Shielding and cable routing

Defined ground!
The position measuring 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, i.e. 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.
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
For information on the permissible bending radius, see
section 7.6 on page 21.
Cable length
Max. cable length 20 m. Longer cables may be used if
their construction, shielding and routing prevent noise
interference.
Observe voltage drop in cable!
The cable has a resistance of approx.
0.4 Ohm/m (back and forth). The nominal
voltage on the BML must not be undercut.