5
Startup
Measuring surface and oil temperature
Assembly and Operating Instructions – Explosion-Proof Gear Units
97
5.5
Measuring surface and oil temperature
INFORMATION
The nameplate data on maximum surface temperature is based on measurements at
standard ambient conditions and installation altitudes. Even slight changes of these
conditions (such as limited installation space) can have a tremendous impact on the
temperature.
5.5.1
Measuring the surface temperature
It is absolutely necessary to measure the surface temperature at maximum load dur-
ing startup of the gear unit. A commercially available thermometer is sufficient for this
measurement. Measure the surface temperature at the transition space between gear
unit and motor where the position of the terminal box prevents venting by the motor
fan. The maximum surface temperature will be reached after approximately 3 hours
and
must not exceed a difference value of 70 K
compared to the ambient tempera-
ture.
INFORMATION
Stop the drive immediately if the difference exceeds the given value. Contact
SEW‑EURODRIVE in this case.
For gear units with AM, AQ, AR adapter, or AD input shaft assembly, the surface tem-
perature is measured at the joint between input gear unit flange and customer motor
flange (see following picture).
°C
18669579
5.5.2
Measuring the oil temperature
It is necessary to measure the oil temperature to determine the lubricant change inter-
vals set forth in the chapter
"
Inspection and maintenance" (→
). Measure the
temperature at the bottom of the gear unit. In case of gear units with oil drain plug,
measure the temperature at the oil drain plug. Add 10 K to the measured value. De-
termine the lubricant change interval based on this temperature values, see chapter
"Lubricant change intervals" (→
24804134/EN – 05/2018
