19.P6.H2G-C2ZK KEB
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The 19.P6.H2G-C2ZK is a drive from the P6 Combivert Pitch Drives series by KEB. It features a through-mount mechanical design with Z fan axis and a rated input voltage of 400 V AC. The drive includes an integrated brake resistor rated at 12 ohms and operates with a rated output current of 52 A.
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Product Description:
The 19.P6.H2G-C2ZK is a pitch-drive inverter unit produced by KEB within the P6 Combivert Pitch Drives series. It is used on wind-turbine hub axes to regulate blade angle, converting a fixed AC supply into controlled three-phase power that positions each blade during startup, generation, and emergency feathering. The housing code G and the through-mount, Z-fan mechanical layout allow the drive to sit directly inside a compact nacelle compartment. Sensors on the control board supply speed and current feedback for closed-loop operation, allowing the inverter to adjust its output in response to blade movement and changing aerodynamic loads.
The inverter is designed for a mains connection of 400 V AC, and under continuous conditions, it delivers a rated motor phase current of 52 A. For transient loads, the protection circuit tolerates an overcurrent of 144 A before it shuts down. Semiconductor gating operates at a switching frequency of 2 kHz, balancing acoustic noise with acceptable switching losses. During stall or low-frequency blade positioning, the power stage can supply 83 A for three seconds at 0 Hz. Dynamic adjustments above 6 Hz permit a higher short-term current of 120 A over the same duration. These current limits allow the drive to overcome static friction and aerodynamic forces without exceeding the thermal limits of the IGBTs or connected motor windings.
An integrated brake resistor with a resistance of 12 Ω dissipates regenerated energy when the blades pitch down rapidly. Excess DC-link voltage is clamped below a maximum high-voltage brake level of 450 V. Internal anti-condensation heaters draw 150 W from a dedicated 400 V feed to keep the electronics above the dew point while the turbine is stationary. Compliance with EMC class C2 simplifies nacelle grounding arrangements. A 5 A charge limiter and a 493 V charge ceiling protect the electrolytic capacitors during initial power-up. The control board uses sensor feedback to maintain pitch positioning under the vibration, temperature changes, and load cycling common in onshore and offshore wind installations.
