What causes KUKA Robot alarm KRC0442?

KUKA smartPAD battery depletion or power loss during active teach pendant use in T1/T2 mode. Wireless connection dropout between teach pendant and KRC4 controller during traversing key command execution. Operator released enabling switch (safety button) while holding start or traversing key during BCO. Connector cable disconnection or loose coupling on teach pendant communication interface. Control unit powered down or reset initiated during active motion command or block commissioning sequence.

How do I fix KUKA Robot alarm KRC0442?

1. Check KUKA smartPAD power level and charge the teach pendant if battery is low or depleted 2. Verify physical cable connections between teach pendant and KRC4 controller are fully seated and undamaged 3. Inspect the connector pins for corrosion or debris using proper cleaning procedures outlined in KUKA maintenance manual 4. Reset the control unit connection by powering down the KUKA smartPAD and restarting the wireless or wired connection sequence 5. Perform a test run in T1 mode with continuous operator supervision holding the enable switch to confirm stable control input 6. If wireless pendant continues dropping, check WiFi/RF interference sources and validate signal strength from the KRC4 diagnostics menu

KUKA Robot codes

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KUKA Robot Controller

System · Advanced

Alarm KRC0442

KUKA Robot KRC0442 - STOP DUE TO UNIT PASSIVE

The operator control unit (KUKA smartPAD or teach pendant) was deactivated or disconnected while actively executing a start key press or traversing key input in T1/T2 mode, or during a block commissioning operation (BCO). This alarm indicates a loss of control input during critical motion commands. The robot stops motion immediately to prevent unsafe uncontrolled operation.

KUKA RobotSystemAdvanced

KRC0442

KUKA Robot KRC0442 - STOP DUE TO UNIT PASSIVE

STOP DUE TO UNIT PASSIVE

Common Causes

KUKA smartPAD battery depletion or power loss during active teach pendant use in T1/T2 mode
Wireless connection dropout between teach pendant and KRC4 controller during traversing key command execution
Operator released enabling switch (safety button) while holding start or traversing key during BCO
Connector cable disconnection or loose coupling on teach pendant communication interface
Control unit powered down or reset initiated during active motion command or block commissioning sequence

Troubleshooting Steps

1Check KUKA smartPAD power level and charge the teach pendant if battery is low or depleted
2Verify physical cable connections between teach pendant and KRC4 controller are fully seated and undamaged
3Inspect the connector pins for corrosion or debris using proper cleaning procedures outlined in KUKA maintenance manual
4Reset the control unit connection by powering down the KUKA smartPAD and restarting the wireless or wired connection sequence
5Perform a test run in T1 mode with continuous operator supervision holding the enable switch to confirm stable control input
6If wireless pendant continues dropping, check WiFi/RF interference sources and validate signal strength from the KRC4 diagnostics menu

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