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Table 7.3b Measures Against Noises
Noise Path
Measures
(1), (2), (3)
If devices or signal cables that handle weak signals and are susceptible to noise (gauges, receivers, sensors,
etc.) are housed together with the AMSE controller or installed near the controller, they may malfunction due to
noise. Thus, the following measures must be taken.
1) Design the system so that noise-susceptible devices are away from the AMSE controller as far as possible.
2) Install noise-susceptible signal cables away from the AMSE controller and its I/O cable as far as possible.
3) Avoid running the signal cables and power cable (AMSE controller’s I/O cable) in parallel or bundling them.
4) Turn “
on
” the EMC filter on/off connector of the AMSE controller.
5) Provide a line noise filter for output to suppress radiation noises from wires.
6) The use of shielded wires for signal and power cables or the housing of such cables in separate metal ducts
is effective.
(4), (5), (6)
If a signal cable is run in parallel to the power cable or bundled with the power cable, electromagnetic or
electrostatic noise may propagate through the signal cable, causing malfunction. Thus, the following
measures must be taken.
1) Design the system so that noise-susceptible devices are away from the AMSE controller as far as possible.
2) Install noise-susceptible signal cables away from the AMSE controller and its I/O cable as far as possible.
3) Avoid running the signal cables and power cable (AMSE controller’s I/O cable) in parallel or bundling them.
4) The use of shielded wires for signal and power cables or the housing of such cables in separate metal ducts
is effective.
(7)
If peripheral devices are connected to the same power line as for the AMSE controller, noise generated by the
AMSE controller propagates through the power cable, causing malfunction of the devices. Thus, the following
measures must be taken.
1) Turn
“
on
” the EMC filter on/off connector of the AMSE controller.
2) Provide a line noise filter for the power cable (output cable) of the AMSE controller.
(8)
If peripheral devices are wired to the AMSE controller to form a closed-loop circuit, leak current may flow
through the ground wire of the AMSE controller, causing malfunction of the devices.
In such cases, remove the ground wire of the devices to prevent malfunction.
Note) Turning “
on
” the EMC filter may cause the earth leakage circuit breaker to malfunction.
Therefore, an earth leakage circuit breaker for high frequencies range must be used.
EMC Filter “
OFF <=>
ON
” Connector
ON
OFF
ON
OFF
⇔
Fig. 7.3b EMC Filter Switch
Fig. 7.3c Line Noise Filter
Line Noise FiltererNote that each
cable should pass through the filter
up to “four” times.
Recommended:
FR-BLF, Mitsubishi Electric Co.
Yuken Order No.: TK290424-1
AMSE
Controller
M
