Machines
Power and control for high-frequency poker vibrators.
A high-frequency converter transforms standard site power into the high-frequency current that drives HF poker vibrators. One converter powers one to four pokers at the same time, giving a concrete crew constant, full compaction output across a whole pour — something ordinary mains power cannot deliver. The HFO and HFO-E ranges span 0.7 kVA to 7.5 kVA of power output, feeding 1–4 poker outlets at 42V/3-phase/200 Hz.
Lievers Holland converters are built around the patented 'syntec' magnet system for reliable, strong output in continuous use. They are available in 230V and 400V electric versions and with a diesel engine for sites without power — in a range of frames from carry-handle units to wheeled cable-reel frames. Electric versions run from the compact HFO 0.7/230 (0.7 kVA, 15 kg) up to the HFO 7.5/400, and the HFO-E carry-frame series covers 1.8–5.3 kVA.
The right converter depends on how many pokers run simultaneously and their combined current draw. Our specialists match converter, cable lengths and pokers into one setup that keeps compacting at full power all shift. As a guide, the HFO-E 5.3 (5.3 kVA) can feed up to 4 outlets simultaneously, while the smaller HFO-E 1.8 (1.8 kVA) covers 2 outlets.
It converts standard 230V/400V site power (or diesel engine power) into high-frequency current for HF poker vibrators. High frequency means smaller, lighter pokers with constant compaction power that doesn't drop under load. Lievers converters output 42V/3-phase/200 Hz current across a 0.7–7.5 kVA range.
Lievers converters power one to four high-frequency pokers simultaneously, depending on the model and the current draw of the pokers. The rule: the sum of the pokers' rated currents must stay within the converter's output. For example, the HFO-E 1.8 (1.8 kVA) feeds 2 outlets while the HFO-E 5.3 (5.3 kVA) feeds up to 4.
Choose 230V for standard site sockets, 400V for heavy multi-poker setups on three-phase power, and the diesel execution for infrastructure or remote sites without reliable electricity. Electric models such as the HFO 0.7/230 through HFO 7.5/400 cover 0.7–7.5 kVA, and diesel executions are available from HFO Diesel 2.5 up to HFO Diesel 6.0.
