AKD User Guide | 10 Configuring General Drive Settings
10.12 Emergency Stop
10.13 Safe Torque Off (STO)
Safe torque off (STO) is a restart lock safety feature that prevents a system restart. The STO input provides
direct electrical control of the power stage of the AKD drive; it bypasses the processor and will disable the power
stage irrespective of software or other hardware signals.
STO is controlled by a digital input on the X1 connector (pin 3) that must have 24V applied to it; otherwise, the
drive will not enable.If the STO digital input does not have 24V applied to it and you attempt to enable the drive
(using the hardware and software enables) the drive will generate a 602 “Safe Torque Off” fault. If you see this
fault you need to apply 24V to the STO input and then clear the fault (DRV.CLRFAULTS) before you can enable
the drive. The STO will not generate a fault until you try to enable the drive. You can read the current faults using
DRV.FAULTS.
-->DRV.FAULTS
602: Safe torque off.
-->
Thecurrent stateof theSTO canbe readusing theSTO.STATE parameter(this returns 1 if 24V is being appliedto
this input). WorkBench alsoshows youthe stateof theSTO input in thestatus barat thebottom of the window.
10.14 Under Voltage Fault Behavior
Youcan adjust the conditions for anunder voltagefault using VBUS.UVMODE in theWorkBench terminal screen:
VBUS.UVMODE = 1 (default)
The drive will not report an under voltage fault unless the drive is enabled and VBUS.VALUE falls
below VBUS.UVFTHRESH
VBUS.UVMODE = 0
The drive will report an under voltage condition any time VBUS.VALUE falls below
VBUS.UVFTHRESH.
When an under voltage fault occurs, the drive is disabled and issues the following alerts:
l
WorkBench alert: 502 Bus Under Voltage
l
Drive LED alert: Left LED displays [F], right LED displays [u-V].
l Fault relay output turns on.
110 Kollmorgen | December 2010
To Next Page
Loading...
Need help?
General
