D860MGB rev04
13/32
Follow the procedures in the manual of the inverter to not risk serious injury, to avoid the risk of
damage the inverter and the correctly connect the power circuit.
Do not power up the inverter without first making the connection to earth
5 OIL FOR LIFTS - CIRCUIT FILLING AND AIR PURGING
5.1
CHARACTERISTICS
The hydraulic oil is a very important part of the hydraulic installation.
In particular, in case of installations having medium or high traffic, "THE CHOICE OF GOOD QUALITY OIL
INCREASES THE TEMPERATURE RANGE WITHIN WHICH THE LIFT WORKS IN A COMFORTABLE
WAY AND INCREASES THE DURATION OF ITS HYDRAULIC COMPONENTS".
A good quality oil for lifts has to have the following main characteristics:
1) Viscosity at 40°C:
= 46 cSt, oil suitable for low temperatures, in particular for the first starts in the morning.
= 68 cSt, oil suitable for high temperatures, in particular caused by high traffic.
2) Viscosity index:
≥150, oil suitable for low and medium traffic.
≥180, oil suitable for medium/high and high traffic.
3) Flash point:
> 190°C
4) Pour point:
< -35°C
5) Specific weight a 50°C:
= 0,88 kg/dm³
6) Air release a 50°C:
< 6
For a quick separation of the air and the elimination of the oil foam.
7) Further characteristics:
-
Anti-oxidant: It prevents the creating of dirt and dregs.
-
Anti-
corrosion: It doesn’t corrode metals, copper, seals etc.
-
Anti-wear: It assures the duration of the moving parts.
-
Anti-rust: It protects and conserves the metallic components.
-
Anti-emulsion: It makes the spontaneous separation of water from oil easy.
5.2
CHOICE OF THE OIL
The oil has to be chosen focusing on the installation characteristics (temperature and ventilation of
the machine room, installation traffic) as well as on the temperature-viscosity characteristics of the oil..
In particular it should be noted that the names of the hydraulic fluid:
-
The number which follows the type or the name of the oil shows only the oil viscosity when its
temperature is 40°C. (es. 32/46/68 cSt ecc.).
-
The viscosity index shows the oil stability when the temperature changes. The oil viscosity increases
when the oil cools and decreases when the oil heats. These variations are important if the viscosity
index is low, consequently "IT IS RECOMMANDED TO USE OILS WITH A HIGH VISCOSITY
INDEX, 150/180/190 according to the situations".
Oils with a low viscosity index, such as 98/110/120, have to be used in installations with an almost
constant room temperature and a number of travel per hour not higher than 8/10. The installation works
well if the viscosity variation is between 250 and 40 cSt about. This can be obtained with an oil having a
high viscosity index, when the temperatures go from 8/15°C to 50/60°C. Oil can be heated or cooled with
proper resistances or heat exchangers to keep the temperature back within the right levels or optimize
the installation working.
Oil has to be heated (optional) when the machine room temperature reaches low values which could
jeopardize the installation working during the first travels in the morning. The car has to be drawn
