20F5A1H-34DF KEB Combivert F5 Compact 52kVA AC/DC Drive

Product Overview

The 20F5A1H-34DF is a high-power frequency inverter from the KEB Combivert F5 series.

This compact drive delivers efficient speed and torque control for 37 kW three-phase AC induction motors.

It integrates dual TTL encoder channels (Channel 1 TTL-IN, Channel 2 TTL-OUT) for precise pulse feedback handling.

Plant engineers utilize this unit for demanding automated machinery requiring integrated GTR7 dynamic braking transistors.

Configuration & Architecture Breakdown

• 20F5A1H-34DF (KEB Combivert F5 Modular Platform)
  • 20 (Power Housing Size Identifier)
    • 37 kW motor shaft rating (52 kVA continuous power delivery).
  • F5 (Product Series Generation)
    • Advanced modular open and closed-loop frequency converter family.
  • A (Compact Series Variant)
    • Universal functional drive design tailored for standard high-power industrial machinery.
    • Integrated internal air-cooler heat sink and GTR7 braking chopper circuit.
  • 1H-34DF (Hardware & Filter Options)
    • Integrated EMC C1 noise suppression filter for strict industrial emission compliance.
    • Dual TTL feedback card setup for master/slave velocity synchronization.

Technical Specifications

Suitable Machinery & Application Scenarios

• Heavy Industrial Extruders: Maintains constant output torque across variable material viscosity profiles.
• Large Centrifugal Compressors: Controls high-power fans and blowers while eliminating severe mechanical start stress.
• Overhead Crane Hoists: Utilizes GTR7 dynamic braking to safely control heavy lowering loads without overvoltage trips.
• Industrial Mixing Vessels: Drives high-capacity Agitators demanding 75A continuous current supply.

Diagnostic Capabilities & System Safety

• Overcurrent Supervision: Triggers instantaneous protection when load spikes cross the 112.0A limit curve.
• DC Bus Voltage Monitoring: Manages internal bus levels during deceleration to prevent dynamic regeneration faults.
• Encoder Pulse Evaluation: Verifies incoming Channel 1 TTL-IN quadrature signals to detect signal dropouts.
• Thermal Overload Tracking: Evaluates air-cooler heat sink temperatures continuously to prevent power module burnout.

System Interoperability

• Operates off 3-Phase AC main grid inputs or direct intermediate DC bus supply lines.
• Channel 2 TTL-OUT allows electronic pulse repeating to slave drives or external counting controllers.
• Integrated EMC C1 line filter eliminates the need for external footprint line filters in standard installations.

Installation & Airflow Recommendations

• Mount the drive vertically on metallic backplates to optimize forced-air heat dissipation paths.
• Leave at least 150 mm top and bottom cabinet clearance for uninhibited intake and exhaust airflow.
• Connect dedicated external braking resistors directly across the GTR7 chopper terminals for high-duty braking.
• Ensure power supply cables comply with 75A continuous current load cross-sectional standards.

Global PLC Spare HUB's Insight

High-power drives like the 20F5A1H-34DF experience severe thermal stress when operated in dirty environments.

Air-cooler heat sink fins clogged with dust frequently cause nuisance heat sink over-temperature fault trips.

Our engineers recommend inspecting internal cooling fan rotation and blowing out heat sink channels semi-annually.

In a plastics manufacturing plant, cleaning the clogged heatsink restored full 75A rated output without thermal derating.

Selection & Purchasing Guidance

• Confirm your motor full-load running current stays below the 75.0A continuous output rating.
• Verify that your feedback encoders utilize 5V TTL square-wave signal output protocols.
• Ensure your cabinet depth accommodates the 255 mm unit depth plus additional wiring clearance.
• Select an appropriately sized external dynamic braking resistor matching the GTR7 chopper specification.

Package Contents, Logistics & Warranty Terms

• Package Includes: 1 x 20F5A1H-34DF Frequency Inverter Drive.
• Warranty Terms: Covered by a comprehensive 12-month industrial performance warranty.
• Dispatch Schedule: Orders processed and shipped within 24 to 48 hours following confirmation.
• Global Delivery: Fast express shipping managed via FedEx, UPS, and DHL worldwide.

Frequently Asked Questions

What role does the TTL-OUT channel play in multi-drive system architectures?

Channel 2 buffered TTL-OUT repeats Channel 1 encoder signals to synchronize secondary slave drives smoothly.

What causes a drive to trip on overvoltage during rapid deceleration cycles?

High load inertia regenerates energy into the DC bus exceeding limits when external braking resistors are undersized.

How can engineers verify that internal GTR7 braking chopper circuit switching works properly?

Measure DC bus voltage during deceleration and verify current flow across the braking resistor terminals using a clamp meter.

Does this unit support direct DC voltage input power hookups?

Yes, the internal intermediate circuit supports direct DC bus power connections across specified voltage ranges.

What maintenance action extends the operational lifetime of internal cooling fans?

Regularly remove ambient particulate buildup from fan blades to maintain balanced rotation and prevent bearing wear.

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