Operation
44 Series 505G2 SilentFlo™ Hydraulic Power Unit
Name and Location Description
Watchdog
OK/Watchdog Fault
Indicator. Used to indicate the status of the watchdog timer.
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. See “Watchdog Fault”
on page 48 to attempt to recover from this fault condition.
Reset Pushbutton /Indicator. Used to reset interlocks.
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.
Emergency Stop
OK/Emergency Stop
Fault
Indicator. Used to indicate whether the safety relay is tripped.
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.
Oil Level OK/Oil Level
Fault
Indicator. Used to indicate if the hydraulic fluid level is within
acceptable limits.
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.
Oil Temp OK/Oil Temp
Fault
Indicator. Used to indicate if the hydraulic fluid temperature is within
acceptable limits.
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.
Motor OK/Motor
Overload
Indicator. Used to indicate if the pump motor is in an acceptable
operating condition.
Motor OK - gray: Indicates the pump motor is within an acceptable
operating condition.
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