[8-4 Checking Transmission Waveform and for Electrical Noise Interference ]
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HWE1314A
GB
8-4
Checking Transmission Waveform and for Electrical Noise
Interference
8-4-1
M-NET
Control is performed by exchanging signals between the outdoor unit and the indoor unit (ME remote controller) through M-
NET transmission. Noise interference on the transmission line will interrupt the normal transmission, leading to erroneous op-
eration.
(1) Symptoms caused by noise interference on the transmission line
(2) Wave shape check
Wave shape check
Check the wave pattern of the transmission line with an oscilloscope. The following conditions must be met.
1) Small wave pattern (noise) must not exist on the transmission signal. (Minute noise (approximately 1V) can be generated by
DC-DC converter or the inverter operation; however, such noise is not a problem when the shield of the transmission line is
grounded.)
2) The sectional voltage level of transmission signal should be as follows.
Cause
Erroneous operation
Error code
Error code definition
Noise interference on
the transmission line
Signal is transformed and will be misjudged as the
signal of another address.
6600
Address overlap
Transmission wave pattern is transformed due to
the noise creating a new signal
6602
Transmission pro-
cessor hardware er-
ror
Transmission wave pattern is transformed due to
the noise, and will not be received normally leading
to no acknowledgement (ACK).
6607
No ACK error
Transmission cannot be performed due to the fine
noise.
6603
Transmission line
bus busy error
Transmission is successful; however, the acknowl-
edgement (ACK) or the response cannot be re-
ceived normally due to the noise.
6607
6608
No ACK error
No response error
Logic
Voltage level of the transmission line
0
V
HL
= 2.5V or higher
1
V
BN
= 1.3V or below
[With transmission]
[Without transmission]
No fine noise allowed
No fine noise
allowed
52 52 52 52
52
V
BN
V
HL
Logic "0"
Logic "1"
Содержание PURY-EP200YLM-A
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Страница 29: ... 1 5 Cautionary notes on installation environment and maintenance 18 HWE1314A GB ...
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Страница 44: ... 2 6 System Connection Example 33 HWE1314A GB 2 Restrictions ...
Страница 58: ... 2 7 Example System with an MA Remote Controller 47 47 HWE1314A GB 2 Restrictions ...
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Страница 125: ... 4 6 BC Controller Circuit Board Components 114 HWE1314A GB 4 6 2 Four Relay Board 4 6 3 Ten Relay Board ...
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Страница 227: ... 6 11 Standard Operation Data Reference Data 216 HWE1314A GB ...
Страница 230: ... 219 HWE1314A GB 7 9 9 Error Code 7113 292 7 9 10 Error Code 7117 293 7 9 11 Error Code 7130 294 ...
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Страница 393: ... 8 16 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit 382 HWE1314A GB ...
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