Mts Series 505G2 SilentFlo Hydraulic Power Unit Model Manuel d'utilisateur télécharger pdf (Page 18)

Model 505G2.07/.11 SilentFlo™ HPU

Auto-Cooling Valve (adjustable)

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 less than 14 MPa

(2000 psi), consult MTS.

Electrical Control

The HPU can be controlled locally using the front panel controls, or remotely

through a controller. A PLC (programmable logic controller) manages the

electrical systems within the HPU. The controls included in the electrical

enclosure include the following:

• A user interface panel that contains a touch screen to program preferences

and operational settings. The screens on the user interface panel provide

quick indication of the unit’s condition, including motors status, running

time displays for each motor, hydraulic fluid level and temperature, and

filter condition.

• Wye-delta starting reduces the initial current rush when the motor starters

are engaged.

• Thermal overloads protect the individual HPU motors from excessive

current draw.

• A latchable Emergency Stop button prevents inadvertent starts.

• Interlocks protect the HPU against low hydraulic fluid level,

overtemperature, and dirty filters.

• A Reset button brings the unit back into operation after a fault has been

detected and corrected.

• A dirty filter signal will not shut the unit down, but will prevent the unit

from starting.

• The power disconnect switch on the door of the main electrical enclosure

ensures that power is removed whenever the door is opened. This device is a

TÜV-certified, lockable, main-disconnect switch.

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Mts Series 505G2 SilentFlo Hydraulic Power Unit Model Manuel d'utilisateur Page 18