MTS Series 505 SilentFlo Hydraulic Power Unit Model 505-180 - Manual (Page 74)

Model 505.60 - 505.180 SilentFlo™ HPU 74
Operating the Model 505.60 HPU Locally or Remotely
Operation
You begin testing using two 7-gpm testing stations. The total hydraulic fluid flow
for the HPU is now 14 gpm. When a third 7-gpm test station starts, the system
flow increases to 21 gpm. This leaves nine gpm of available flow for the HPU.
The available flow is below the 10 gpm set for the Minimum Avail Flow
Trigger, so after 5 seconds at this flow level, the HPU starts the enabled pump
motor with the next lowest number of running hours on it. The total full flow for
the HPU is now 60 gpm and the available, or reserve, flow is 39 gpm. As more
testing stations are started and the available flow once again goes below the 10
gpm minimum level for 5 seconds, the third pump starts.
If tests are halted and the system flow becomes less than 50 gpm for a period of
10 minutes (the Next Stage Off Delay), the HPU will turn off the pump with the
highest number of running hours on it. This cycling of pumps on and off
continues as the flow demand changes.
If it is determined that more (or fewer) pump modules are needed while in ROD
control, pumps can be enabled (or disabled) from the Main Display screen while
the HPU is running.
Additionally, the ROD control mode can be disabled by pressing the Auto
Demand (ROD) button on the Main Display screen (the button turns gray). This
causes all enabled pumps to start and the HPU will be running in manual mode.
The ROD control mode can be re-enabled by pressing the Auto Demand (ROD)
button again (the button turns green).
Operating the Model 505.60 HPU Locally or Remotely
The HPU can be operated locally using the controls on the user interface panel or
remotely using your system controller.
Local operation
1. Make a general inspection of the HPU. Ensure that all cooling water valves
are open. Ensure the Emergency Stop button is released.
2. If not already displayed, press the Main Display button to open the Main
Display screen.
3. Verify that the Remote button is gray. If the button is green, press the button
to change it to gray (indicating local mode).