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Programmatic Comparison · Engineering Brief
Technical duel: ARJES Impaktor 1250 E (VFD electric, 500 kW, 14 t hooklift, no HV cable) vs UNTHA XR mobil-e (quad-shaft electric, ~25 t, HV trailing cable). Infrastructure, torque, downtime, TCO.
| Spec | ARJES Impaktor 1250 E | UNTHA XR mobil-e |
|---|---|---|
| Drive concept | Dual-shaft asynchronous VFD (electric) | Quad-shaft electric (synchronized cutting map) |
| Motor configuration | 2 × 335 HP asynchronous (VFD-controlled) | 132–268 HP (model-dependent) |
| Drive power (kW) | 500 | 132–200 |
| Operating weight (t) | 14 (hooklift-compatible) | ~25 (lowboy + HV cable) |
| Asynchronous torque baseline (Nm) | 160 000 (per-shaft VFD) | ~100 000 (split across 4 shafts) |
| HV cable infrastructure | Not required (VFD soft-start on 20 kV) | Required (~€80k trailing cable install) |
| Transformer station procurement (CAPEX) | Not required (VFD soft-start on existing 20 kV) | Required: dedicated 400/690 V step-down transformer (€45,000–€80,000) |
| Heavy-duty trailing cable + distribution panel | Not required (integrated switchgear) | Required: 4-core 4"² HV cable + DDL panel (~€18,000–€32,000) |
| Grid connection delay (rural yards) | 0 months (plug-and-play on existing industrial feed) | 6–12 months (utility permit + transformer commissioning) |
| Shaft cassette swap / repair (hrs) | 2 (quick-change cassette) | 96 (quad-shaft hardfacing cycle) |
| Service interval (hrs) | 500 | 400 |
| Material | ARJES Impaktor 1250 E | UNTHA XR mobil-e |
|---|---|---|
| RDF / refuse-derived fuel | 39-55 ST/h | 28-39 ST/h |
| Municipal solid waste | 44-61 ST/h | 33-44 ST/h |
| C&D waste | 66-88 ST/h | 33-50 ST/h (RDF-focused machine) |
| Commercial waste | 33-50 ST/h | 22-33 ST/h |
Gate fees, landfill taxes, and electricity prices swing the verdict by ±30%. Run the live TCO model for your region to see real payback.
No. The VFD soft-start capability of the 1250 E ramps the dual 250 kW motors on a programmable torque curve, holding inrush at 1.1× rated current — invisible to standard 20 kV industrial substations. The UNTHA XR mobil-e typically requires a dedicated HV trailing cable installation (~€80,000 capex) and substation breaker upgrades.
The ARJES dual-shaft asynchronous design concentrates 160,000 Nm baseline torque per shaft, with VFD modulation allowing each shaft to slow down independently for clearing obstructions. The UNTHA XR mobil-e splits power across four synchronized shafts — yielding tighter RDF fraction but lower per-shaft torque (~100,000 Nm combined) and no independent reverse capability per shaft.
The ARJES quick-change cassette system allows shaft exchanges in ~2 hours — the operator swaps the worn cassette for a refurbished one and returns the worn unit to the ARJES service center for hardfacing off-site. The UNTHA XR mobil-e and other monolithic-shaft competitors require the full 96-hour in-field hardfacing cycle (welding + multi-pass hardfacing + stress relief + cool-down + grinding).
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