Owner manual

9. Press Run to start the HPU in low pressure.
10. Press High Pressure to select high pressure mode.
The number of pumps running will be determined by the setting on the ROD Setup screen.
11. To disable run on demand after it is running, without turning off the HPU, pressing the ROD button will
disable it.
12. Pressing the Stop button will turn off the HPU and disable run on demand.
Run On Demand Detailed Example
Run On Demand (ROD) is a system that monitors the output flow of the Hydraulic Power Unit (HPU) and
turns on and off pumping modules as needed to best meet the users demands. The parameters for ROD that
need to be set by the user include:
• On Delay: the period of time that must pass where the criteria are met or exceeded before the next
module(s) will be turned on.
• Off Delay: the period of time that must pass where the criteria are met or exceeded before the next
module(s) will be turned off.
• Module Flow: the flow capability of a single pumping module within the HPU (see table).
• Startup Flow: the minimum flow capacity that should be available when the HPU is on.
• Buffer Flow: the minimum flow that should be available beyond the actual current flow. (6 gpm is added
to this value in order to compensate for the circulation pump within the HPU).
For reference in setting up run on demand, the following table shows the flow capacity of the available pump
modules.
PressureFrequency
34.4 MPa27.5 MPa21 MPa
5000 psi4000 psi3000 psi
50 lpm75 lpm100 lpm50 Hz
13 gpm20 gpm26 gpm
61 lpm85 lpm113 lpm60 Hz
16 gpm22 gpm30 gpm
The following example uses these settings:
• Module Flow is set at 30 gpm.
• Startup Flow is set at 10 gpm.
• Buffer Flow is set at 4 gpm (which means the total actual buffer is 10 gpm), Δton represents the on delay
and Δtoff represents off delay.
Series 505G2 SilentFlo™ Hydraulic Power Unit Product Information 59
Operation