83
Safe Torque Off (STO)
3ADW000488R0101 DCS880 Service manual e a
After about 300 ms the value of 31.98 STO
actual status must be 0xA.
Shortly after the value of 31.98 STO actual
status must be 0x0.
Compare the values of 31.94 STO time 1
and 31.95 STO time 2. Their values must
be within ±50 ms of 300 ms.
Drive must show fault 5093 Safe off main
contactor XSMCSTO.
It will also show fault 5092 STO overall
fault.
Most likely also fault 3280 Mains low
voltage is displayed.
Relay XSMC:STO (3, 4) on the SDCS-
CON-H01 must have been opened.
The load switching element e.g. a mains contactor (MC), an air circuit breaker (ACB), a DC breaker
(DCB) or a high speed DC breaker (HSDCB) connected to XSMC:STO must have been opened.
The control board must be rebooted (cycle auxiliary power) afterwards, as relay XSMC:STO is only
closed once during the boot of the drive.
Test the function of connector XSMC when the motor is stopped.
− Give a stop command for the drive (if running) and wait until the motor shaft is at a standstill.
− Ensure that the drive operates as follows:
− Unplug connector XSMC.
− Give a start command. The motor should not generate torque. The used load switching
device, e.g. a mains contactor (MC), an air circuit breaker (ACB), a DC breaker (DCB) or a
high speed DC breaker (HSDCB) must not close.
− Re-plug connector XSMC.
Reset any active faults. Restart the drive and check that the motor runs normally.
Document and sign the repetitive function test which verifies that the fault shutdown path of the safety
function is safe and accepted for operation in the machine log book.
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