Manual for MVK-MPNIO Modules
V 1.9 11
Grounding
A
short (as short as possible), low-impedance connection between the grounding point and the
reference ground is essential to divert interference voltages running between the device and
reference ground.
The inductivity of standard FE conductors is a high impedance for high-frequency interference
voltages. For this reason, the use of grounding straps is advisable. If this is not possible, a fine-
wire FE conductor should be selected with the largest possible cross section, and the connec-
tion to ground should be kept as short as possible.
Cable Routing
Y
ou can avoid EMC problems by observing elementary basic rules of cable routing:
R
oute data lines as far as possible away from power lines.
Route data lines and power lines at least 10 cm apart.
Intersect data and power lines at right angles only.
Route data and power lines in separate, shielded compartments.
Remember the interference potential of other devices or lines when routing the cables.
Place frequency converters, motor lines, and other devices and lines that emit high-
frequency interference at the greatest possible distance.
Voltage Drops
S
hort-term voltage drops normally do not pose operational problems as the electronics are pro-
tected by capacitors integrated in the power circuits. This does not apply to the power supply of
the sensors and actuators connected to the module. Their high power requirement cannot be
covered by the capacitors integrated in the device. For this reason, even transient interruptions
of the actuator supply can result in undesirable switching operations.
D
ue to the integrated input filter, a change in the input signal of less than 1 ms does not cause a
change of the input state signaled to the Master. Longer interruptions of the sensor supply may
cause changes of the input signal.
Separate Power Supplies
W
ith modules Art. Nos. 55283, 55287, 55288, and 55289 sensors or actuators can be powered
by a common power supply unit. However, it is preferable to use separate power supplies in or-
der to maximize the electromagnetic compatibility of the overall system.
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