MTS Hydraulic Power Unit Model 506-92 - Manual (Page 10)

Operation 2-2
Table 2-1. Controls and Indicators
Control/Indicator Description
Power On indicator* The Power On indicator lights to indicate that electrical power is
applied to the HPU.
Emergency Stop switch This switch operates in both local and remote control and is
used during emergency situations only. When pressed, it
immediately shuts down the HPU (the supercharge pump may
continue to run briefly to supply the main pumps until they
fully stop).
Local Mode switch If the Local Mode switch is activated, you can operate the HPU
with the front panel controls. If it is not activated, use a remote
control device to operate the HPU. Activation lights an LED in
the upper right corner of the switch.
Start switch Pressing Start sequences supercharge and main motors on, then
applies low pressure when in local control.
High Pressure Pressing High Pressure applies high pressure in local control.
Start
must be pressed before applying high pressure. Activation
lights an LED in the upper right corner of the switch. The LED
also lights if high pressure is requested remotely.
Stop switch When Stop is pressed (in either local or remote mode), the HPU
first ramps to low pressure and then goes to zero pressure. The
supercharge pump continues to run for approximately 15
seconds.
Reset switch This switch resets the interlock circuit if the condition causing
the interlock has been corrected.
Low Oil Level indicator When this indicator lights, the hydraulic fluid level has dropped
below a preset value.
Fluid level gage This gage indicates the level of hydraulic fluid in the reservoir.
Over-Temperature
indicator When this indicator lights, hydraulic fluid temperature has
exceeded a preset value.
Temperature gage This gage indicates the temperature of the hydraulic fluid in the
HPU reservoir.
Dirty Filter indicator When this indicator lights, the low-pressure filter needs
replacement. See Subsection 3.1.1.
Pump 1 Select Pressing this switch selects Pump 1 for operation. Activation
lights an LED in the upper right corner of the switch.
Pump 2 Select Pressing this switch selects Pump 2 for operation. Activation
lights an LED in the upper right corner of the switch.
Hour Meter
Pump No. 1 This front panel meter indicates the total operating hours of
pump 1.
Hour Meter
Pump No. 2 This front panel meter indicates the total operating hours of
pump 2.