NORD Drivesystems B2000 - Manual (Page 30)

4. Commissioning
-30- B2000-GB-0413 www.nord.com
 The measured temperature of the surface of the gear unit housing plus the difference
between the highest permissible air temperature Tu stated on the rating plate and the
measured air temperature must be at least 15°C lower than the maximum permissible
surface temperature, i.e.:
ATEX labelling: II 2G c T4 / II 3G T4: Tgm + Tu – Tum < 135°C – 15°C
ATEX labelling: II 2D c Tmax / II 3D Tmax: Tgm + Tu – Tum < Tmax – 15°C
Tgm: measured temperature of the surface of the gear unit housing in °C
Tum: measured air temperature in °C
Tmax: maximum surface temperature according to gear unit rating plate (ATEX labelling) in °C
Tu:
upper value of the permissible ambient temperature range according to the rating plate in °C
Centre dot is white: Centre is black:
OK Temperature was too high
Figure 4-3: Temperature sticker
4.4 Operation with lubricant cooling
The drive may only be commissioned after the cooling spiral has been connected to the cooling
circuit, and the cooling circuit has been put into operation.
The coolant must have a similar thermal capacity as water (specific thermal capacity at 20°C
c=4.18 kJ/kgK). Industrial water without any air bubbles or sediments is recommended as a
coolant. The water hardness must be between 1° dH and 15° dH, and the pH value must be
between pH 7.4 and pH 9.5. No aggressive liquids should be added to the coolant!
The coolant pressure must not exceed 8 bar. The required quantity of coolant is 10
litres/minute, and the coolant inlet temperature should not exceed 40°C; we recommend
10°C.
We also recommend fitting a pressure reducer at the coolant inlet to avoid any damage due to
excessive pressure.
If there is a danger of frost the operator should add a suitable anti-freeze solution to the cooling
water.
Danger!
The temperature of the cooling water and the cooling water flow rate must be
supervised and ensured by the operator.
The ATEX approval is void if these instructions are not observed!