nord 6052902/0213, Manual With Installation Instructions, Page: 66 / 128

Industrial gear units – Manual with installation instructions
66 B 1050 en-3921
4.8 External cooling system (Option: CS1-X, CS2-X)
NOTICE
Gear unit overheating
• Only start commissioning the drive after the cooling unit has been connected and commissioned.
• The standard painting / coating is only suitable for the range C1/C2 according to DIN EN
ISO 12944.
NOTICE
Damage due to high line pressure
• In case of cold starting, ensure that the maximum permissible viscosity of the lubricant is not
exceeded, in order to prevent excess pressure in the pump and the lubricant lines.
The main components of the external cooling system are the motor pump, filter and heat exchanger.
Usually, the cooling system is equipped with a pressure switch to monitor the pump and therefore the
cooling.
Unless otherwise stated by the manufacturer, the following applies for external cooling systems:
• A value of -0.4 bar must not be undershot on the suction side.
• The viscosity must not exceed 1000 - 1500 cSt at 1500 rpm.
Information about the cooling system and control information should be obtained from the operating
instructions of the cooling system. The manufacturer’s specifications are definitive.
Information
Temperature regulation is provided by means of a resistance thermometer (PT100), which is installed
in the oil sump of the gear unit.
It is recommended that the cooling unit is only switched on above an oil temperature of 60 °C and
switched off below an oil temperature of 45 °C.
4.8.1 Oil / water cooler (Option: CS1-X)
For oil/water coolers, the temperature and flow volume of the cooling water must be monitored and
ensured. The maximum permissible cooling water inlet temperature is defined during the planning
phase and can be found in the order data. The maximum ambient temperature is 40 °C. If higher
ambient temperatures may occur, verification must be made by Getriebebau NORD prior to
commissioning.
The permissible lubricant temperature range is 10 °C to 80 °C.
If there is a danger of frost, a suitable anti-freeze solution must be added to the cooling water in due
time.
The permissible contamination for oil/water coolers is a suspended particle quantity of less than
10 mg/l and a particle size of less than 0.6 mm (spherical). Fibrous substances result in a large
increase in pressure losses.