MTS Series 793 - Manual (Page 215)

Description Setting
Series 493 Hardware—An interlock occurs if an excitation failure
is detected. Enabled
Series 494 Hardware—The action selected in the Action list occurs
if an excitation failure is detected. If an excitation failure is detected
on an active mode input, the controller application will force an
interlock.
No action occurs if the hardware detects an excitation failure. Disabled
Note:
Do not disable excitation failure checking unless you are
using sensors with either : 1) An external excitation source,
or 2) High-impedance sensors that do not draw enough
current for the excitation failure circuit to function properly.
If the sensor input signal is the active mode input, the “Interlock”
action occurs if an excitation failure is detected. Enable when Active (default)
If this signal is not used as an active mode input, no actions are
taken if an excitation failure is detected.
Excitation Failure Actions (Series 494 Hardware Only)
When the excitation failure mode is set to “Enabled,” you can choose a specific excitation failure from the
Action list. The action selected from the Action list occurs if an excitation failure for that sensor input is detected.
Active mode excitation failure
If an excitation failure is detected on an active mode input, the controller application will force an interlock.
Excitation Failure Action Settings
Description Setting
No action occurs. Disabled
Stops any program command, writes a message to the Message Log,
turns off pressure at the hydraulic service manifold (HSM), and switches
the indicator from green to red. Station Power Off
Note:
A Station Power Off condition must be reset to resume testing.
For single station systems: If the “Last Off” function is enabled in the
.hwi file or equivalent jumpering, the hydraulic power unit (HPU) is
turned off. If the “Last Off” function is disabled, the HPU will remain
on.
For multistation systems: If the “Last Off” function is enabled in the
.hwi file or equivalent jumpering, the hydraulic power unit (HPU) will
be turned off only if the interlock occurs on the last station running. If
the “Last Off” function is disabled, the HPU will remain on.
MTS Series 793 Control Software 215
Station Setup