Sources Of Electrical Interference And Countermeasures; Dust Proof Cover - Honeywell DCP551 Mark ΙΙ User Manual

Chapter 3. INSTALLATION AND MOUNTING

Sources of electrical interference and countermeasures

HANDLING PRECAUTIONS

Dust proof cover

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• The following noise generation sources are generally presumable.
(1) Relays and contacts
(2) Solenoid coils and valves
(3) Power lines (especially those carrying more than 90VAC)
(4) Inductive loads
(5) Inverters
(6) Motor rectifiers
(7) Phase angle control SCR
(8) Wireless communications equipment
(9) Welding machines
(10) High voltage ignition devices
• If the source of noise cannot be removed, take the following measures.
• Use a CR filter to suppress fast-rising noise.
Recommended CR filter: No. 81446365-001
• Use a varistor to suppress high-amplitude interference.
Recommended varistors:
No. 81446366-001 (for 110 to 120V)
81446367-001 (for 200 to 240V)
Varistors must be handled carefully as they become defective if they are short-
circuited.
Use the soft dust proof cover when the DCP551 is used in locations where there is a lot
of dust.