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9.0 Wind Turbine Operation
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.
DOC012R02 AOC 15/50 User Manual Nov 2001
77
Table 9.1-6 PLC AC inputs
9.1.7.2 PLC Outputs
The following tables describe the PLC outputs needed to control the AOC 15/50. AC outputs
are used to control interposing relays and contactors for the various wind turbine functions. DC
outputs are used for driving the LED indicators.
Function Description
Dynamic brake contactor Normally closed contacts are used to apply brake on loss of
power.
Parking brake relay Normally open contacts are used to apply brake on loss of
power.
Tip brake relay Normally open contacts are used to apply brake on loss of
power.
Generator contactor Connects generator to utility network.
Condensation heater relay Provides 150 W of heating to the generator and 50 W to the
parking brake to expel condensation.
Transmission heater relay Provides 75 W of heating to the transmission.
Remote start output relay
(optional)
Closure of N.O. contacts causes downstream turbine to start.
Oil heater (optional) Provides power to gearbox oil heater.
Softstart relay (optional) Closure of N.O. contacts bypasses softstart resistor
Table 9.1-7 PLC AC outputs
9.1.8 Control Systems Options
•
Soft-start options – resistor or electronic softstart.
•
Enclosure heater (typically 200 Watt).
•
Drip-proof NEMA 3 and weatherproof enclosures NEMA 4.
•
Tropical, marine (stainless steel) and arctic conditioned enclosures (heater and
insulation).
•
Enhanced display functions and diagnostics.
§
Over/under frequency.
§
G59 compatible grid monitor for UK sites.
§
PLC LCD display.
§
Wind turbine run time meter.
•
Remote communications and data acquisition via RS 422 port.
9.2 Emergency Operation
In case of any emergency, an emergency cutoff switch is provided externally on the control box.
See Section 3.8 for emergency procedures.