MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-30 - Manual (Page 42)

Model 505.20 - 505.30 SilentFlo™ HPU 42
Recovering from an Interlock
Operation
4. Turn the start switch to the High position to operate the HPU at full
pressure.
Note If the HPU generates an interlock during operation (low fluid level or high
temperature), the HPU will be stopped. Once the cause has been
corrected, press the Reset button before restarting.
5. To stop the HPU, press the red Stop button.
Remote operation
Remote operation can occur at a remote control panel or from your system
controller software. The controller must be connected to the HPU.
Note MTS controllers can issue the off, low, and high signals to the HPU to
control the hydraulic pressure.
This procedure requires the controller be connected to the HPU.
1. Make a general inspection of the HPU. Ensure that all cooling water valves
are open and that the external hydraulic circuit is ready for pressure to be
applied. Ensure the Stop button is released.
2. Start the HPU at your controller.
3. Check the HPU for leaks and unusual sounds. Stop the HPU immediately if
leaks or unusual sounds are noted. Determine the cause and fix the problem
before restarting the HPU.
4. Select high pressure at your controller.
Note If the HPU generates an interlock during operation (low fluid level or high
temperature), the HPU will be stopped. Once the cause has been
corrected, press the Reset button before restarting.
5. Stop the HPU with the controller.
Recovering from an Interlock
This section describes how to reset each type of HPU interlock. If one of the
interlock indicators (Low Level, Overtemperature, Dirty Filter) is lit, the HPU
will not start. You must determine the source of the interlock (which indicator is
lit) and correct the cause before using the HPU.
Low level
The Low Level indicator lights when the hydraulic fluid falls below the setting
of the low level/overtemperature sensor which is mounted to the top of the
reservoir. To correct a low level interlock:
1. Add hydraulic fluid to the reservoir until the fluid level gage indicates the
proper level.
2. Press the Reset button to clear the interlock and turn the indicator off.
Overtemperature
The Overtemperature indicator lights when the temperature exceeds 55°C
(131°F). The temperature is detected by the low level/overtemperature sensor
mounted on the reservoir. The HPU cannot be restarted until the fluid has cooled.
To correct an overtemperature interlock: