MTS Series 505G2 SilentFlo Hydraulic Power Unit Model 505G2-180 - Manual (Page 54)

Description Name and Location
Indicator. Used to indicate the status of the watchdog timer. Watchdog OK/Watchdog Fault
Watchdog OK - gray: Indicates the PLC that controls the HPU
is operating normally.
Watchdog Fault - red: Indicates there is a problem with the
hardware watchdog timer and the PLC is not operating
correctly. A watchdog fault cause the HPU to shutdown.
Pushbutton /Indicator. Used to reset interlocks. Reset
Reset - gray: Indicates no active interlocks.
Reset - blue: Indicates one or more interlocks are active.
Pressing the button in this state will clear the interlock(s)
provided the cause of the interlock(s) has been remedied.
Indicator. Used to indicate whether the safety relay is tripped. Emergency Stop OK/Emergency Stop
Fault
E-Stop OK - gray: Indicates the safety relay has not tripped.
E-Stop Fault - red: Indicates the safety relay has tripped. The
cause of a safety relay trip is either the main panel E-stop
button, an external e-stop button, or the HPU watchdog timer.
Indicator. Used to indicate if the hydraulic fluid level is within
acceptable limits. Oil Level OK/Oil Level Fault
Oil Level OK - gray: Indicates the hydraulic fluid level is within
acceptable limits.
Oil Level Fault - red: Indicates the hydraulic fluid level is not
within acceptable limits and an interlock is active.
Indicator. Used to indicate if the hydraulic fluid temperature is
within acceptable limits. Oil Temp OK/Oil Temp Fault
Oil Temp OK - gray: Indicates the hydraulic fluid temperature
is within acceptable limits.
Oil Temp Fault - red: Indicates the hydraulic fluid temperature
is not within acceptable limits and an interlock is active.
Indicator. Used to indicate if the return filter is within acceptable
limits. Return Filter OK/Return Filter Fault
Return Filter OK - gray: Indicates the contamination in the
return filter is within acceptable limits.
Return Filter Dirty - yellow: Indicates the contamination in the
return filter is not within acceptable limits. This state will not
generate an active interlock, but alerts the user that the filter
requires maintenance.
The HPU cannot be started with an active return filter warning
Indicator. Used to indicate if the pressure filter is within
acceptable limits. Pressure Filter OK/Pressure Filter
Fault (optional)
54 Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information
Operation