Wrong fixes start by treating A200 EINSCHWENKEN W3 GESPERRT as a general turret failure. On this TRAUB TNS 30/42D, REV1 and REV2 indexed normally, while REV3 did not move after either T1515 in MDI ($1) or the manual sequence F0 > H0 > H2 (REV.3) > H1 (indexed). The valve-plug LED stayed off, and an electrical check found that the command did not reach the valve. That localizes the first fault domain to the REV3 command/interlock/output path, before turret mechanics.
Wrong fixes and their diagnostic limits
Repeated tool calls will not clear a missing permissive or restore an absent output. T1515 reproduces the fault, but repetition adds no diagnostic information after A200 appears and the valve LED remains dark.
Mechanical intervention is also premature. The REV3 tool head had not been used for one year, and the machine had stood for three weeks, so sticking remains possible. However, a stuck mechanism normally still receives an actuation command. With no valve indication, opening the turret or forcing motion bypasses the more immediate electrical finding and can cause damage or injury.
Treating A200 as harmless because the rest of the machine runs is another dead end. The message may permit unrelated operation, but it blocks the requested REV3 swing-in sequence. Its effect must be judged at the failed function, not by whether other axes or revolvers remain available.
Command energy and interlock chain
The motion requires electrical energy at the valve coil, followed by valve actuation and then mechanical movement. The number that matters is the voltage measured across the REV3 coil terminals while the command is active; coil current is the second quantity. A dark connector LED is an indicator, not a complete measurement, but it places the investigation upstream until terminal measurements prove otherwise.
The functional chain is: operator or tool command, REV3 selection, swing-in permissives, control decision, output channel, wiring and connector, valve coil, valve movement, and turret movement. A200 identifies the blocked swing-in request at the control level. It does not by itself identify which permissive, output device, conductor, or load failed.
This is energy and timing, not merely logic. Measure during the interval in which the command should be present. A meter reading taken before the request or after A200 cancels the sequence may miss a short command. If the controller never authorizes the output, the coil receives zero actuation energy regardless of its mechanical condition.
Quantities, limits, and read points
| Item | Observed or required result | Where to read it | Decision |
|---|---|---|---|
| REV3 motion | No motion during T1515 or the manual sequence |
Machine and position feedback | Reproduce the fault under a controlled command |
| Other revolvers |
REV1 and REV2 rotate normally |
Manual operation and feedback | Use working channels as comparison points, not proof that REV3 logic is healthy |
| Valve-plug LED | Off during the REV3 request | REV3 valve connector | Trace command, permissives, output, and wiring before mechanical disassembly |
| Coil voltage | Compare with the documented command voltage; no value is supplied here | Across the coil terminals during the request | Rated voltage with no movement points toward the connector, coil, valve, or mechanics |
| Coil current | Compare with the coil datasheet or electrical drawing | Series measurement or suitable current probe | Voltage with zero current indicates an open load path; abnormal current requires coil and wiring checks |
| Permissive state | All required REV3 swing-in conditions true | Control CHECK/diagnostic screens | A false condition explains why the control withholds the output |
| Output state | Commanded state must correspond to terminal voltage | Control diagnostics, output module, and terminal strip | Separates logic inhibition from a field-circuit fault |
Electrical-first diagnostic procedure
- Record the complete active message set and the machine state immediately before
A200. A second interlock message may identify the missing condition more directly. - Reproduce the failure with one known sequence, either
T1515inMDI ($1)orF0 > H0 > H2 (REV.3) > H1 (indexed). Watch the REV3 valve-plug LED throughout the request. - Open the control CHECK or diagnostic pages and monitor the REV3 request, its swing-in permissives, and the associated output state. Capture every relevant screen before changing parameters.
- If the request is present but a permissive remains false, trace that input to its field device and wiring. Compare the signal sequence with
REV1orREV2only where the machine documentation shows equivalent functions. - If the control output indicates off, resolve the interlock or configuration path before testing the valve mechanically. If the control indicates on, measure at the output channel, terminal strip, connector, and finally across the coil to locate where voltage disappears.
- With power isolated and stored energy controlled, check conductor continuity, connector seating, contact condition, coil continuity, and shorts to the appropriate reference. Use the documented coil rating when interpreting resistance and current.
- If rated command voltage reaches the coil during the request, move the investigation downstream to the valve and turret mechanism. After a year without REV3 operation, inspect for sticking, contamination, loss of actuator force, or a feedback device that never changes state.
REV3 comparison without false substitutions
The two working revolvers provide live reference behavior: command timing, indication sequence, output transition, and feedback order. Compare those stages against REV3 to find the first divergence. The first missing transition is more useful than the final A200 symptom.
Do not transplant parameters, connectors, or output assignments between channels unless the electrical and control documentation identifies them as equivalent. The available documentation lacked the REV3 electrical control schematic, so wire identity and output allocation must come from terminal labels, cabinet records, CHECK screens, or the correct machine-specific drawing rather than inference.
A parameter review is justified when the physical output never becomes commanded despite apparently valid inputs. Preserve the original values and screenshots. A changed enable, option assignment, channel mapping, or interlock state can suppress the valve command, but no specific parameter identifier is established for this machine.
Repair verification and recurring pitfalls
Verification must prove the whole sequence, not merely clear the message. Command REV3 repeatedly from the same mode that originally failed, confirm the valve indication and measured coil voltage appear at the expected stage, observe complete swing-in motion, and verify that indexed feedback changes before the control advances. Then test T1515 and the manual sequence separately.
Recheck REV1 and REV2 after the repair to detect shared wiring or configuration changes. Inspect the repaired connection under normal cabinet and machine movement; an intermittent conductor can pass a stationary continuity test and fail during actuation.
Recurring pitfalls include measuring to an unsuitable reference instead of across the coil, observing the meter outside the command window, trusting the connector LED as proof of coil voltage, clearing messages before recording diagnostics, and changing parameters without a backup. Mechanical freeing may restore movement temporarily while leaving weak actuation or missing feedback unresolved.
FAQ
Why does the TRAUB TNS 30/42D show A200 for REV3?
A200 EINSCHWENKEN W3 GESPERRT appears when the REV3 swing-in request is blocked. Read the CHECK screens to find the first missing permissive or output transition.
Why does REV3 stay still while REV1 and REV2 rotate?
The shared machine functions can remain operational while the REV3-specific command, interlock, output, wiring, valve, or mechanism fails. Compare each stage and stop at the first signal that differs.
Why is the REV3 valve connector LED off?
The output may not be commanded, voltage may be lost between the output and connector, or the indicator circuit may be faulty. Measure across the coil during the command and trace backward if voltage is absent.
Why does T1515 produce A200 but no turret movement?
T1515 requests the function but cannot override a missing swing-in permissive. Monitor the REV3 request, interlocks, output state, and field voltage while the command is active.
Why can a long idle period matter after the electrical signal is restored?
REV3 had been unused for one year, so a valve or mechanical element may also be stuck. Investigate that path only after the documented command voltage reaches the coil and the output timing is correct.
Stop testing if the correct drawing is unavailable, signal identities cannot be verified, the coil draws abnormal current, or controlled actuation could produce unsafe motion. Escalate to official TRAUB support with the machine identification, complete A200 text, CHECK-screen captures, command sequence, coil voltage and current readings, and the first point where REV3 differs from a working channel.