3011 Axis drives disabled.
Sheet 4 Plug 2 Pin-R
This fault is due to the loss of 24 volts from axis drive unit through ALC 2 contactor, wire no. 417, TB1 in the power distribution panel to the control.

a) Check for 24 volts at wire 238 on the ALC 2 contactor. If 24 volts is present and the same error code persists, the fault may be the wire 417 from TB1 to Plug 2 pin-R or a faulty 'Digital Input Board', DI 500 or DI 502. Switch off the control and transpose the 'DI' boards situated in the lower rack to the left. Power-up the machine. If the fault disappears, or a different unrelated error code shows-up, then the 'DI' board is faulty and a replacement is required. If the same error code persists switch off the machine, remove plug 2 and check the continuity from pin-R to terminal 417. There may be a spare wire in the cable loom to utilize if wire 417 appears to be broken. If the wiring is O.K. the fault may be with the 'Watchdog' board (WD 50x) in the control or corruption of the memory. If another control is available the 'Watchdog' boards can be exchanged to test. If the memory is to be reloaded remember to punch-out programme and tool information first (although an up to date back-up tape should always be held).

b) If 24 volts is not present at wire 238, then check for 24 volts at plug X10 pin no. 4, below the Bosch Drive Unit. If 24 volts is not present, then check and replace any faulty fuse in the Bosch Drive.