Electromagnetic/induction noise
Manual b maXX
®
BM1000
Document No. 5.07003.04 Baumüller Nürnberg GmbH
98
of 174
8.7
8.7 Electromagnetic/induction noise
Many sources of noise surround the device and penetrate it by radiation or conduction. It may
cause malfunctioning of the control circuits and even damage the device. Of course, there are
solutions to increase the noise tolerance of the device. But this has its limits. Therefore it will be
the best to solve it from the outside as follows.
m Add surge suppressor on the relays and contacts to suppress switching surges.
m Shorten the wiring length of the control circuit or serial communication and keep them sepa-
rated from the power circuit wiring.
m Comply with the wiring regulations by using shielded wires and isolation amplifiers for long
length.
m The grounding terminal should comply with the local regulations and be grounded indepen-
dently, i.e. not to have common ground with electric welding machines and other power
equipment.
m Connect a noise filter at the mains input terminal of the device to filter noise from the power
circuit. b
maXX
®
1000 can have a built-in filter as option.
In short, solutions for electromagnetic noise exist of „no product“ (disconnect disturbing equip-
ment), „no spread“ (limit emission for disturbing equipment) and „no receive“ (enhance immuni-
ty).
8.8 Environmental condition
Since the b maXX
®
1000 is an electronic device, you should comply with the environmental con-
ditions as stated in ZD.1 Required environmental conditions– from page 142. Here are some
remedial measures if necessary.
m To prevent vibration, the use of anti-vibration dampers is the last choice. Vibrations must be
within the specification. Vibration causes mechanical stress and it should not occur frequent
-
ly, continuously or repeatedly to prevent damage to the device.
m Store the device in a clean and dry location, free from corrosive fumes/dust to prevent corro-
sion and poor contacts. Poor insulation in a humid location can cause short-circuits. If neces-
sary, install the device in a dust-proof and painted enclosure and in particular situations, use
a completely sealed enclosure.
m The ambient temperature should be within the specification. Too high or too low temperature
will affect the lifetime and reliability. For semiconductor components, damage will occur once
any specification is out of range. Therefore, it is necessary to periodically check air quality
and the cooling fan and provide extra cooling of necessary. In addition, the microcomputer
may not work in extremely low temperatures, making cabinet heating necessary.
m Store within a relative humidity range of 0 % to 90 % and non-condensing environment. Use
an air conditioner and/or exsiccator.
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