SPECIFICATIONS FOR AMF CONTROLLER. Functional Requirements:- All the functional requirements in Auto mode are to be achieved through microprocessor based AMF Controller. • The logic for starting & stopping shall be:-
i. If the mains fail, or one or more phase of mains is not available.
ii. If any phase voltage of mains is out of preset limits however there should be a provision to set the limits of higher and lower phase voltages as per the site requirement. The mains supply with in this range shall be considered as healthy so as to avoid continuous running of Engine Alternator Set.
iii. The system should measure 48V battery of the telecom equipment. In case the battery voltage is above a settable limit & room temperature as measured in the AC Controllers logic is below a preset max room temperature, the engine should not start unless one of the conditions fails. • As the operating range of the power plant is from 90 V to 300 V (L-N) and that of AC Voltage stabilizer is quite wide, the AMF relay should be able to trigger E/A Set for starting and stopping in accordance with this range. • Switch the load to the engine supply after suitable time delay, after starting the engine on mains failure/phase failure / low voltage / high voltage. • Switch the load back to the mains supply after suitable time delay, when healthy mains supply is restored and stopping the Engine. • Attempt to start the Engine up to three times on failure of earlier attempts with suitable time intervals. • Two level fuel sensor for fuel should be provided at 50% & 25% respectively. • System should provide following settable features :-
a) Mains failure time - to initiate automatic EA start after 0 to 300 seconds of mains failure.
b) Mains restore time - to initiate automatic stop of EA after 0 to 300 seconds of mains in stable conditions.
c) Low oil pressure delay time - 0 to 99 seconds delay of the low pressure oil input alarm from engine start.
d) Stop solenoid time - 10 to 99 seconds enabling time for "stop solenoid".
e) Cranking up time - 0 to 99 seconds enabling time for starter. The timer is reset if the engine starts before the programmed time.
f) Start attempts - 1 to 3 numbers of automatic attempts during automatic start cycle.
g) Attempts interval - 1 to 99 seconds time interval between starting pulse attempts.
h) Cooling down time - 0 to 300 seconds engine cooling time before stopping. During this time the engine runs without load.
i) Generator voltage time - time of stable generator voltage to close EA contacto...
