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Key Technical Specifications
- Manufacturer: KUKA
- Model: KPS-600/20-REL
- Part Number: 00-111-847
- Application: Power supply for KUKA KR C2 robot controller cabinets
- Rated Input Voltage: AC 400/415 V
- Rated Input Current: 15 A
- Rated Output Voltage: DC 565/585 V
- Rated Output Current: 20 A
- Weight: 6.5 lbs (per distributor listing)
- System Role: Powers KSD (KUKA Servo Drive) modules, which are in turn controlled via the DSE-IBS (Digital Servo-Electronics with Interbus interface)
- Compatible Controller Generation: KR C2
⚠️ Several distributor pages attach generic claims to this part number — “≥92% efficiency,” “CE/UL/CSA/TUV,” “-20°C to +50°C,” “5 kg weight” — that read as templated copy repeated verbatim across unrelated products on the same sites, and they conflict with each other (5 kg vs. 6.5 lbs / ~2.95 kg listed elsewhere). Don’t publish those figures without confirming them against the physical nameplate or KUKA’s own KR C2 documentation.
Product Introduction
The KUKA KPS-600/20-REL is the DC bus power supply unit for KUKA’s KR C2 robot controller cabinet, converting AC 400/415 V input into a regulated DC 565/585 V bus at up to 20 A to feed the cabinet’s KSD servo drive modules. It sits at the center of the KRC2 power architecture — the KSDs draw from this bus to drive the robot’s axis motors, with motion and communication handled through the DSE-IBS Interbus interface.
This is a maintenance-critical part for any facility still running KR C2-generation robots — KUKA has moved on to newer controller platforms, so this power supply is sourced almost exclusively as a replacement for a failed unit in an existing cell, not for new robot installations. Because the KPS family includes closely related variants (REL, ESC) with different internal designs, matching the exact suffix to your existing unit matters before ordering a replacement.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Controller won’t power up, no DC bus voltage | Loss of AC input to the KPS unit | ❌ Low | Measure AC 400/415V input terminals with a multimeter | Check upstream breaker/contactor before replacing |
| DC bus present but robot faults on motion enable | Downstream KSD servo drive fault, not the power supply | ❌ Low | Check KSD status LEDs and KRC2 diagnostic messages | Isolate to a specific KSD before condemning the KPS |
| Intermittent bus dropout under load | Aging internal components (common on legacy KPS units) or loose input connection | ✅ High | Retorque input terminals, monitor bus voltage under actual axis load | Aging units are a known factor at this equipment age |
| KRC2 shows power supply fault code | Internal KPS protection trip (overcurrent, overtemp) | ✅ High | Check the specific fault code in the KRC2 diagnostic buffer | Cross-reference the fault code before assuming full replacement is needed |
| Unit runs but cabinet fans/cooling seem inadequate | Cooling system issue unrelated to the KPS itself | ❌ Low | Check cabinet fan operation and filter condition | Rule out cabinet cooling before replacing the power supply |
Most “dead robot” calls on KRC2 cells trace back to a specific KSD fault or a cabinet cooling issue rather than the KPS bus supply itself — check the KRC2 diagnostic buffer for the actual fault code before condemning this unit. If you’re still stuck, contact technical support with the fault code, cabinet ambient temperature, and photos of the unit’s nameplate.
KPS-600/20-REL
Frequently Asked Questions (FAQ)
Is the KPS-600/20-REL still available new from KUKA?
KR C2 is a legacy controller generation, so new-production availability is limited to none through official channels. What’s in the market is used, refurbished, or repaired stock — you’re sourcing this to keep an existing cell running.
Can I substitute a KPS-600/20-ESC for the REL variant?
Don’t assume it. REL and ESC are different suffix variants in the same KPS-600/20 family, and internal design differences between them aren’t something a distributor listing reliably confirms. Check your existing unit’s exact part number and, ideally, confirm compatibility with KUKA documentation or a qualified integrator before swapping.
Why is this cheaper than a factory-new unit — what condition is it in?
Because it’s used, refurbished, or repaired stock, not current KUKA production. Ask your supplier directly what testing was performed — a bench test under simulated axis load is a stronger claim than a simple power-on check for a unit feeding a 565–585V DC bus.
Does it need reconfiguration when swapped into my cabinet?
There’s no field-programmable configuration on the power supply itself — it’s a fixed-output rectifier/supply stage. The system configuration lives in the controller and DSE-IBS setup, not in this unit.
Is it hot-swappable?
No. This is a high-voltage DC bus supply (565–585 Vdc) — de-energize the cabinet and follow proper lockout/tagout procedure before removing or installing it. Treat it with the same respect as any high-voltage servo drive power stage.
What warranty applies to a used or repaired unit?
Terms vary significantly by seller — some list “used” with minimal warranty, others offer 12-month coverage on repaired/reconditioned units. Confirm the specific warranty terms in writing before you buy, given the voltage levels involved.
What’s the biggest install mistake to avoid with this part?
Skipping proper discharge/lockout procedure. This unit outputs 565–585 Vdc to the servo bus — internal capacitors can retain dangerous voltage after power-down. Always follow KUKA’s documented de-energization and discharge procedure before touching internal connections, regardless of how confident you are that the cabinet is “off.”
