MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-11 - Manual (Page 39)

505.07/.11 HPU Controls
Model 505.07/.11 SilentFlo™ HPU Operation 39
C ONTROL /I NDICATOR F UNCTION
Power On Indicates when power is applied to the HPU from the main electrical circuit.
Low Level Indicates when the hydraulic fluid falls below a preset level. A low fluid level
will cause an interlock and turn the HPU off. The interlock signal can be
monitored by your system controller.
After adding hydraulic fluid to the reservoir, press the Reset button to clear the
interlock and turn the indicator off.
Overtemperature Indicates when the temperature of the hydraulic fluid exceeds 55°C (131°F).
Overtemperature will cause an interlock and turn the HPU off. The interlock
signal can be monitored by your system controller.
Dirty Filter Indicates when the filter needs replacement. A dirty filter condition will
prevent the HPU from being started, but it will not stop the HPU while it is
running. The signal can be monitored by your system controller.
After replacing the filter, press the Reset switch to clear the interlock and turn
the indicator off.
Stop Turns the pump motor off. The Stop button is a latching switch. Once it is
pressed, it remains pressed until it is reset. Pull the button out to reset the Stop
button.
Reset Clears any interlocks caused by the HPU. This switch operates independently
from any other reset functions in your control system.
High/Low/Start Starts the pump motor and selects the pressure setting. Turn the start switch to
the Start position and hold it until the pump motor runs. Releasing the switch
returns it to the Low position, which indicates the HPU is running in the low
pressure mode. Turn the switch to the High position to permit high pressure
output.
Hour Meter Records how long the pump has been running. Use the hour meter to schedule
maintenance.
Main disconnect switch Allows access to the electrical enclosure to perform maintenance.
The main disconnect switch is located on the upper right corner of the electrical
enclosure door. The red switch on a yellow background has two functions:
• Disconnects electrical power from the electrical enclosure when the
switch is off (O).
• Contains a mechanical release so the door of the electrical enclosure
cannot be opened when the switch is on (|).
Turn the switch counterclockwise to disconnect electrical power and release
the front panel (additional screws help secure the front panel).