[5. Precautions For Use] - Daikin SUT Series Operation Manual

SE-04753

[5. Precautions for Use]

(1) The motor pump of this hydraulic unit is mounted via vibration suppressing rubber that prevents motor pump
vibration from being conveyed to the unit.
The pump should be connected to the unit with a hose.
(2) This hydraulic unit is equipped with a fan motor to cool the hydraulic oil and the motor.
To ensure spaces for air intake and exhaust, do not place an obstacle at 10 cm or shorter distance from the fan
motor air intake and exhaust planes.
(3) This hydraulic unit incorporates a check valve that provides an orifice in the discharge line. If high response is
required for machine pressure release or other purpose, the machine must be provided with an additional pressure
release circuit.
If the load volume is large, you may hear a fluid flow sound from this orifice when the unit is stopped. However,
this phenomenon does not indicate abnormality.
(4) This hydraulic unit uses an IPM motor, which generates counter-electromotive force during changeover
(regenerative operation). If the motor is frequently turned ON/OFF in the operating condition that easily generate
counter-electromotive force, it causes regenerative overload, resulting in unit stop.
(5) This hydraulic unit is equipped with a safety valve.
This safety valve has been set to a specified pressure before shipment. However, the set pressure of the safety
valve may decrease while the machine is repeatedly used for a long period, or due to contaminants in the hydraulic
oil.
If this unit is continuously used with the safety valve activated, it may output an alarm due to a temperature rise
and so on.
In this case, re-adjust the safety valve pressure setting according to "Attachment: Safety Valve Adjusting
Procedure" on p. 41.
For protection of peripheral equipment (actuator, pressure gauge, etc.) of the master machine, it is recommended
that the safety valve pressure setting should be "Unit pressure setting + 0.5 MPa" in order to suppress surge
pressure.
[Operation Manual]
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