ULVAC G-20DA (01) PDF DOCUMENT

Upon unpacking your ULVAC G-20DA pump, you should check the following:

(1) Is the pump the correct model you ordered?

(2) Is any part of the pump damaged in transit?

(3) Are the specified accessories included?

For the ULVAC G-20DA, please ensure the following conditions are met during storage, installation, and operation:

(1) Ambient temperature, relative humidity: 7°C – 40°C, 85% RH or less

(2) Height above sea level during storage and installation: 1000 m or less

(3) Minimum required distances from the wall: 100mm or more

(4) Other conditions for storage and operation:

a. Free from corrosive and explosive gases.

b. No condensation.

c. Dust-free environment.

d. Indoors.

e. Do not place pumps on top of each other or place a pump on its side.

f. Not subject to direct sunlight.

g. Far from heat sources.

h. When you keep it for a long period of time, put pump oil into a pump and seal an inlet port with a cap.

i. Don’t keep it where moisture is attracted.

Install the ULVAC G-20DA pump level with the inlet port facing up. The pump should be installed on a level surface in a location with minimal dust, dirt, and humidity. The location should be arranged with consideration for ease of installation, removal, inspection, and cleaning.

To lubricate your ULVAC G-20DA, remove the oil-filling plug, and then fill the oil (one time charge) to the pump or recommended oil (SMR-100) up to the specified quantity through the oil filling port. In the first oil charging, pour the oil up to the maximum scale of the oil gauge. Then, attach the exhaust port.

The oil quantity must be checked or adjusted to keep it always in the range of the oil gauge during pump operation. Improper oil quantity may cause performance deterioration of the pump, and also may cause damage. When the oil quantity is out of the gauge scale, the ultimate pressure becomes higher, and it may cause a bubbling sound like “poko poko”.

For the ULVAC G-20DA, install the shut-off valve (A) and the pump vent valve (B) in between the pump inlet port and the vacuum chamber.

The ULVAC G-20DA has performed beforehand electric wiring by the side of the pump.

(1) If the motor specification is single-phase 100V, the power cord will be a power cord with a plug. Power cords other than single-phase 100V use 3-core loose ends.

(2) Make sure the working power supply voltage is consistent with the motor working voltage.

(3) Connect the power cord of the pump to the power supply.

(4) An overload protector (thermal protector, manual reset type) is provided for this pump.

To start the ULVAC G-20DA pump, close the pump vent valve (B); open the shut-off valve (A) to the inlet port of the pump, then turn on the power switch to start the operation. The pump will begin running.

To shut down the ULVAC G-20DA, first close the shut-off valve (A), then open the pump vent valve (B), and then turn off the power switch of the pump.

If you stop the pump without opening the pump vent valve, the oil will fill the inside of the pump cylinder within several minutes. This may cause back-flowing of oil to the vacuum vessel. For the next operation, restarting the pump will be difficult because of non-smooth rotation, thermal protector operating, or the motor firing due to overloading.

When stopping the pump operation due to an electric stoppage, close the shut-off valve (A) quickly and then open the pump vent valve (B).

The ULVAC G-20DA incorporates an overload protector (Thermal protector, manual reset type). The thermal protector activates when the pump motor is overloaded (e.g., locked rotor, out of range voltage, close ventilation).

When the thermal protector has been actuated, turn off the switch and contact a ULVAC representative. The motor is very hot when the thermal protector has actuated. Never touch it with your hand.

When the cause of the malfunction has been eliminated, check that the motor has cooled down, and restart operation. The use of another protective device (such as an earth leakage breaker) in addition to the overload protector is recommended.

An OMT-050A oil mist trap can be installed on your ULVAC G-20DA to remove oil mist from the pump. To install it, remove the standard outlet port from the outlet port of the pump and install the oil mist trap instead. The oil mist trap not only prevents oil mist generation but also reduces exhaust noise.

The pressure of the vacuum device may increase due to the deterioration of the pump oil in your ULVAC G-20DA. In such a case, close the inlet port of the pump and check that the specified ultimate pressure has been reached. If it has not, replace the oil.

Pump oil replacement procedure:

(1) Unplug the inlet port and operate the pump for 5 seconds. This will discharge the remaining oil inside the pump effectively.

(2) Remove the outlet port and drain plug to discharge the pump oil.

(3) Plug the drain port; charge the recommended new oil as a fixed quantity from the exhaust port.