Bosch Rexroth LT353 Manual page 21

3 609 929 B46/2008-09 | LT353/LT354/LT355
Displays and operating elements
The front panel of the servo amplifier contains
two LEDs to display the operating state and
the reset button for resetting the tightening
channel after a fault.
Table 1
LED/but- Display Diagnosis
ton
BTB No power supply or LT is in
Off
download mode
Green Ready for operation
Not ready for operation, but
Green,
no system error; emergency
flashing
OFF has been triggered
Red System error
VM power supply module not
Orange
ready
FG Off No servo amplifier release
Green Servo amplifier release
When pressed, a reset is performed to
Reset
reinitialise the tightening channel
Bosch Rexroth AG
BTB LED function. This LED primarily
serves to signal faults. There are 4 states of
the BTB LED:
• LED with steady green light: No fault, LT
ready for operation
• LED flashing green: No fault, LT not ready
for operation, interruption of NH signal
(emergency OFF)
• LED with steady red light: Fault, LT not
ready for operation
• LED with steady orange light (red and
green steady light alternately): Abort
tightening and switch off the LT (sleep
mode) as VM350 power supply module is
not ready for operation.
• LED flashing red/green alternately: LT not
yet logged in to SE controller.
During tightening: If the emergency OFF
signal is interrupted during tightening, e.g.
due to EMERGENCY OFF, tightening is
actively braked and tightening is aborted with
an error message output to the SE. The BTB
LED has a steady red light. The fault can be
reset in the LT as soon as the emergency
OFF signal is received again and the
contactor has tightened. The BTB LED then
has a steady green light again. A new
tightening can be started only after
acknowledgement via the operating program.
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