PLC Inputs, Function Description

9.0 Wind Turbine Operation

9.1.7.1 PLC Inputs

The following tables list and describe the input signals to the PLC controlling the AOC 15/50.

Function		Description

Anemometer #1	0-5	VDC analog signal corresponds to 0-45 m/s (0-100 mph).

Anemometer #2	0-5	VDC analog signal corresponds to 0-45 m/s (0-100 mph).

Generator speed proximity	Pulse input to F/V converter. 1-5 VDC signal corresponds to 0
switches #1 and #2	to 2,000 rpm.

Watts Transducer Control	0-5	VDC analog signal corresponds to 0-8 kW.

Table 9.1-6 PLC low level analog inputs

	Function		Description

Generator thermal switch			3 series connected switches within the generator.

Grid Voltage monitor			Relay contact indicating loss of phase, phase reversal and under
			or over voltage.

Grid	Frequency	monitor	Relay contact indicating over or under frequency.
(optional)

Master control relay			Used to determine whether or not the turbine has been reset.

Turbine OFF/TEST/ON			Maintained switch parks or starts the turbine. In test position it
			allows special test functions to become active.

Rotor jog switch			Maintained switch releases the brakes and connects the turbine
			to the grid. Available in test mode.

Parking brake release switch			Maintained switch releases the parking brake. Available in test
			mode.

Dynamic brake test switch			Maintained switch used in combination with the rotor jog
			switch to delay operation of the tip and parking brakes to verify
			the effectiveness of the dynamic brake. Available in test mode.

Remote start (optional)			Allows a turbine to be started by another turbine's controller; its
			own anemometers (if equipped) are ignored.

Remote line start (optional)			Causes an across the line start if remote start is true.

NOTICE: Use of the material contained in this document is subject to the warning on page Iv and the disclaimer on page v of this document.

AOC 15/50 User Manual

Nov 2001