Nachi NRP Series Power Package

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Nachi NRP Series Power Package

Japan, Nachi

Made in: Japan
Manufacturer: NACHI
Model: NRP series

Features

Energy-saving
The amount of power consumed is 50W^(*1), approximately 95% down

Low noiz

Produces a sound level of 57dB(A) while operating and makes absolutely no noise when it comes to a stop.

Low heat-generating
The rise of oil temperature to room temperature +7°C^(*1)

Compact
Installation space 35% down (our standard unit ratio)

Leak compensation
At time of accumulator (option) installation
→ Even when stopped, it maintains the pressure, so the energy-saving effect is greater

(*1) This value is the result of a measurement in the machining center inside our company’s factory. It will vary depending on the size and number of hydraulic cylinders installed in the machines and the hydraulic circuits.

Specifications of NRP Series

Example system configuration (machining center cramp)

The unit accumulates pressure in the accumulator and stops the electric motor with the set upper pressure limit of the pressure switch. Using the oil pressure accumulated in the accumulator, the unit maintains the pressure of the circuit and carries out and , and when it reaches the set lower pressure limit of the pressure switch it is re-started. (Start and stop the electric motor at the signal from the pressure switch.)

Hydraulic circuit diagram

The pressure switch, accumulator, filter kit, and reducing valve are options. Select these options according to your application.

Package Specifications

	NRP-10-12-10	NRP-10-24-10	Remarks
Pump capacity	3.0cm³/rev	5.0cm³/rev
Motor output – No. of poles	1.2kW-4P	2.4kW-4P	S3: Repeated operation
Rate of loaded operating time (per minute)	15% (9seconds)	10% (6seconds)
Tank specification	Resin tank (10 liters)
Options
Pressure switch	One output point (open collector)		Fixed pressure type
Accumulator	0.7 liters
Reducing valve	Pressure adjustment range: 1.5 – 7.0MPa
Tank specifications	Steel plate tank (10 liters)		Steel-plate tank has a special design number

Explanation of model number

Dimension Table

Precautions for handling

Precautions when operating (procedures that you must comply with)

The NRP series power package is a hydraulic package for intermittent operations (electric motor ON-OFF). If the load operation time is excessive or a mistaken operational method is used, there is a danger of damage to the device resulting from the heating of the electric motor and hydraulic fluid, so use the unit only after reading the instruction manual carefully.
Load operation hour rate 1.2kW-4P···15% 2.4kW-4P···10%
In order to carry out intermittent operations, it is necessary to set up a pressure switch, etc. inside the circuit and have a circuit that turns the points of contact on the power source side ON and OFF.
When carrying out an overhaul, release the bleeder valve to let out the pressure inside the accumulator first. (At the time of accumulator installation)
The accumulator (optional specifications) is filled with nitrogen gas. When discarding an accumulator, be sure to remove the gas first.
The transportation and installation of accumulators (optional specifications) is subject to regulations so contact our company regarding the details.

Precautions when starting the unit

Operate the unit after confirming with a fluid level gauge whether the hydraulic fluid inside the tank satisfied the prescribed level (the lower limit value or above).
(1) Upper limit: prescribed volume of hydraulic fluid (nominal capacity)
(2) Lower limit: minimum hydraulic fluid level

Connect the electrical wire connections without any mistakes as follows.

Phase sequence of the electric motor side and the power source side	In the case of a mistake with the wire connections
U → (R) V → (S) W → (T)	The electric motor will reverse-rotate and will not discharge the hydraulic fluid from the pump. Confirm that the pressure is rising in the pressure gauge attached to the discharge side.

Hydraulic fluid

General mineral oil type hydraulic fluid equivalent to viscosity grade ISO VG32

Maintenance and Inspection

Oil temperature : use in a range of 560°C.
Timing of hydraulic fluid replacement
At the beginning, replace the fluid after three months of operation.
Subsequently, replace the fluid when it is contaminated or after every one year has passed.
Inspection of the inside of the tank and the strainer: every three months.
Gas sealing of the accumulator (optional specifications) is not possible. Regular replacement will be necessary.