Mitsubishi Electric MR-D30, Instruction Manual, Page: 87 / 156

4. SAFETY OBSERVATION FUNCTION
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(6) Noise rejection filter
(a) Summary
The noise rejection filter is a function to set a filtering time to reduce the noise of input signals. Set
the filtering time of the noise rejection filter with [Pr. PSD12 Input device - Noise rejection filtering
time DI1] to [Pr. PSD17 Input device - Noise rejection filtering time DI6].
The longer the noise rejection filtering time, the higher the tolerance to chattering or noise, but the
response to the input signals will be lower. The shorter the noise rejection filtering time, the higher
the response to the input signals, but the tolerance to chattering or noise will be lower.
When the test pulses are in superposition in the input signals, the noise rejection filtering time needs
to be set considering the test pulse off-time. The following shows the specific settings of the noise
rejection filtering time.
Structure Noise rejection filtering time
Using a switch
Executing a test pulse diagnosis
Set 0.888 ms or longer time than set time in [Pr. PSD26 Input
device - Test pulse off time].
Not executing a test pulse diagnosis Set 0.888 ms or longer time.
Using a device
Test pulses are in superposition in the output
signal of the device. Set 0.888 ms or longer time than the test pulse off-time
outputted from the device.
Test pulses are not in superposition in the
output signal of the device.
Set 0.888 ms or longer time.
(b) Parameter setting
With the following parameters, set the noise rejection filtering time to each input device to which
function is assigned with [Pr. PSD02 Input device selection DI1] to [Pr. PSD07 Input device selection
DI6]. In addition, refer to section 4.4.1 (7) because the response time of the input device changes
depending on the noise rejection filtering time.
Parameter Name
PSD12 Input device - Noise rejection filtering time DI1
PSD13 Input device - Noise rejection filtering time DI2
PSD14 Input device - Noise rejection filtering time DI3
PSD15 Input device - Noise rejection filtering time DI4
PSD16 Input device - Noise rejection filtering time DI5
PSD17 Input device - Noise rejection filtering time DI6