Mts Series 505G2 SilentFlo Hydraulic Power Unit Model Manuel d'utilisateur télécharger pdf (Page 47)

Adjusting the HPU Output Pressure Level

Model 505G2.07/.11 SilentFlo™ HPU

Adjusting the HPU Output Pressure Level

1. Turn on high hydraulic pressure. Ensure that there are no flow demands by

the system.

2. Loosen the nut securing the output pressure control.

3. Monitor the hydraulic pressure gage located on the control manifold. Adjust

the output pressure as follows until the desired pressure is displayed.

• Turn the output pressure control clockwise to increase the pressure.

• Turn the output pressure control counterclockwise to decrease the

pressure.

Note If this pressure level is to be used for longer than 10 minutes, proceed to

“Adjusting the auto-cooling level” procedure.

4. Hold the output pressure control to prevent it from moving and tighten the

nut to secure it.

5. Check the hydraulic pressure gage to ensure that the desired hydraulic

pressure is being maintained.

Adjusting the Auto-Cooling Level

The auto-cooling function is integrated into the control manifold. During periods

of low flow demand from the external hydraulic circuit, this feature provides two

important benefits: a re-circulating flow that ensures hydraulic fluid filtering

whenever the unit is on, and safeguarding against hydraulic fluid over-

temperature. It functions by opening a hydraulic flow path through the fluid

conditioning circuit when external hydraulic demand for flow is low. When the

external demand increases, this feature closes the path to provide the full flow of

the HPU to the external demand.

The effective operating range of the auto-cooling circuit is between system

pressures of 14 MPa (2000 psi) to 21 MPa (3000 psi). In order for the Auto-

Cooling Valve to function properly, it must be re-adjusted anytime the output

pressure will be changed for longer than 10 minutes.

Note If the test condition requires a maximum pressure level of less than 14

MPa (2000 psi), consult MTS.

An incorrect adjustment may cause one of two conditions:

• An over-temperature interlock as indicated by the front panel indicator. A

mis-adjustment of the Auto-Cooling Valve may prohibit the flow of

hydraulic fluid across the heat exchanger

• Unexpectedly reduced system performance. A mis-adjustment of the Auto-

Cooling Valve may reduce the full flow of the pump to the external circuit

The Auto-Cooling Valve is factory set for an output pressure setting of 21 MPa

(3,000 psi). If the HPU will be operated with a 0.2 MPa (25 psi) or larger

decrease (or increase from a lower set pressure) for a period exceeding 10

minutes, an adjustment to this valve will ensure that neither of these conditions

occurs. The Auto-Cooling Valve is located on the control manifold.

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Mts Series 505G2 SilentFlo Hydraulic Power Unit Model Manuel d'utilisateur Page 47

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