8
PIM00504
1.4 Precaution
(1) Regarding the hydraulic connections to this hydraulic unit, use hoses to prevent transmission of
the vibration of the motor pump to the machine.
(2) This hydraulic unit is equipped with a fan to cool the hydraulic oil, controller and motor. To assure
the air intake and exhaust for the fan, do not place any obstruction within 10 cm from the unit. In
addition, install the unit at a location with good ventilation so that hot air does not remain.
(3) Turning the power ON/OFF frequently significantly shortens the life of the controller. Run and
stop this hydraulic unit by using start/stop digital inputs. Leave an interval of at least 8 minutes
between stopping and running of the unit by turning the power ON/OFF. When stopping and
running of the unit with start/stop signals, leave an interval of at least 0.5 seconds between the
stop command and restarting.
(4) This hydraulic unit is equipped with a safety valve. The high-pressure safety valve is set at 1.5
MPa as factory default. Readjust the set pressure of the high-pressure safety valve according to
your usage by following “13.8 High-pressure Safety Valve Adjustment Instructions”.
Note also that the set pressure of the high-pressure safety valve may drop due to repeated
protracted operation of the machine or contamination in the hydraulic oil. If the product is used
continuously with the safety valve actuated, an alarm may occur due to temperature rise for
example. In this case too, carry out readjustment.
(5) Restrict continuous use at the maximum pressure to 5 L/min or less.
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