30
Operating Instructions – Explosion-Proof AC Motors – DRS/DRE/DRP 315
7
Reinforced bearing
Inspection/Maintenance
Relubrication
period
The relubrication intervals for the bearing correspond to the following table for the fol-
lowing conditions:
• -20 °C to + 40 °C ambient temperature
• a 4-pole speed
• and a normal load
At greater speeds, higher loads or higher ambient temperatures, the relubrication in-
tervals are shorter.
7.3
Reinforced bearing
The reinforced bearing is only offered with the /NS (relubrication) option so as to facili-
tate optimal lubrication of the bearing. Please observe the notes on bearing lubrication
in section "Bearing lubrication of the DR.315" (see page 29) .
Horizontal mounting position
Vertical mounting position
Motor type
Duration
Quantity
Duration
Quantity
DR.315 /NS
5000 h
50 g
3000 h
70 g
DR.315 /ERF /NS
3000 h
50 g
2000 h
70 g
STOP
In the /ERF (reinforced bearing) option, cylindrical roller bearings are installed on the A
side. These must not be operated without an overhung load, otherwise you risk dam-
aging the bearings.
