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% 3. Operation
% When you connect a 12 to 14 V DC power supply to the external power socket these things happen:
%) Current can flow from the small positive pin to the solenoid, the solenoid operates and closes the % relay. %) Current can flow from the large positive pin through the external power relay to the main bus
% system %) The large negative pin is connected to ground. % If the polarity of the power supply is incorrect, then the diode will prevent current from flowing through
% the solenoid. The solenoid will not operate and current cannot flow through the external power relay % to the bus system.
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% % Trouble-Shooting % 1. General
% The table below lists the defects you could have with the external power system. If you have the % trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair % given in the Repair column.
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Trouble Possible Cause Repair
External power will not come on line. No external power. Make sure that the external power plug is securely in the socket. Make sure that the external power is operating correctly.
External power relay is defective. Do a test of the external power relay, if necessary, replace the external power relay.
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% Maintenance Practices % 1. General
% This Section tells you how to remove/install the external power relay. Refer to the component % manufacturers manuals for more data and shop data.
% 2. Electrical Safety
% The DA 40 has a low voltage DC electrical system. When correctly maintained it is safe to work on. % The battery can supply heavy current through low resistance circuits (for example, if you ground the % positive output with a wrench by accident).
% Always follow the usual safety practices for working on electrical equipment. Allow only qualified % persons to maintain the electrical system.
% CAUTION: DISCONNECT THE BATTERY BEFORE DOING MAINTENANCE ON % THE ELECTRICAL SYSTEM. MAKE SURE THAT YOU DISCONNECT % THE NEGATIVE LEAD FIRST.
% CAUTION: AFTER DOING ELECTRICAL MAINTENANCE ALWAYS DO A % CONFIDENCE TEST OF THE SYSTEM WITH A 12 VOLT POWER % SUPPLY THAT HAS OVER-CURRENT PROTECTION. DO THIS % BEFORE CONNECTING THE BATTERY
% CAUTION: USE ONLY DA 40 SPARE PARTS APPROVED BY THE % MANUFACTURER.
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% 3. Remove/Install the External Power Relay
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% A. Remove the External Power Relay %
Detail Steps/Work Items Key Items/References 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：钻石40飞机维护手册 DA 40 SERIES AMM 2(65)
