8
Timing chart
z
Excitation timing
Power supply input
0.2 s or less
0.1 s or less
0.2 s or less
0.2 s or less
0.2 s or less
10 s or less
*
OFF
ON
OFF
ON
OFF
ON
Non-excitation
Excitation
ALM output
AWO input
Motor excitation
* Turn on the power supply again after the PWR/ALM LED is turned off.
z
Operation timing
OFF
ON
FWD input
Motor operation
*
*
*
*
*
*
*
* : 2 ms or less
*
*
*
*
OFF
ON
RVS input
OFF
ON
M0 input
Noise measures
The electrical noise is of two types: One is a noise to invade into the driver
from the outside and cause the driver malfunction, and the other is a noise to
emit from the driver and cause peripheral equipments malfunction.
For the noise that is invaded from the outside, take measures to prevent the
driver malfunction. It is needed to take adequate measures because signal
lines are very likely to be affected by the noise.
For the noise that is emitted from the driver, take measures to suppress it.
z
Measures against electrical noise
There are the following three methods mainly to take measures against the
electrical noise.
•
Noise suppression
y
When relays or electromagnetic switches are used together with the
system, use noise filters and CR circuits to suppress surges generated by
them.
y
Cover the driver by a metal plate such as aluminum. This is effective in
shielding the electrical noise emitted from the driver.
•
Prevention of noise propagation
y
Place the power lines, such as the motor and power supply cables, keeping
a distance of 100 mm (3.94 in.) or more from the signal lines, and also do
not bundle them or wire them in parallel. If the power cables and signal
cables have to cross, cross them at a right angle.
y
Use shielded twisted pair cables of AWG22 (0.3 mm
2
) for power lines and
AWG24 to AWG22 (0.2 to 0.3 mm
2
) for signal lines.
y
Keep cables as short as possible without coiling and bundling extra lengths.
y
To ground a shielded cable, use a metal cable clamp that will maintain
contact with the entire circumference of the cable. Ground the cable clamp
near the product.
Cable clamp
Shielded cable
y
When grounding PE terminals of multiple drivers to a grounding point, it
becomes more effective to block the electrical noise since impedance on
the grounding point is decreased. However, ground them so that a potential
difference does not occur among the grounding points. A connection cable
(for signal) that includes a ground wire is provided. Refer to p.11 for details.
•
Suppression of effect by noise propagation
Loop the noise propagated cable around a ferrite core. Doing so will prevent
the propagated noise invades into the driver or emits from the driver. The
frequency band in which an effect by the ferrite core can be seen is generally
1 MHz or more. Check the frequency characteristics of the ferrite core used.
To increase the effect of noise attenuation by the ferrite core, loop the cable a
lot.
z
Noise suppression parts (accessories)
See p.11 for accessories.
•
Connection cable
This cable is a shielded twisted pair cable for good noise immunity to
connect the driver and programmable controller. The ground wires useful
to grounding are provided at both ends of the cable. The EMC measures are
conducted using the Oriental Motor connection cable.
•
Surge suppressor
This product is effective to suppress the surge which occurs in a relay contact
part. Connect it when using a relay or electromagnetic switch. CR circuit for
surge suppression and CR circuit module are provided.
