7
Mounting positions
Churning losses and thermal rating
Assembly and Operating Instructions – Explosion-Proof Gear Units
137
7.2
Churning losses and thermal rating
(→
X
)
Churning losses may occur with the following conditions. They must be considered
during thermal check:
•
A mounting position where the first gear unit stage is fully immersed in the lubric-
ant. The respective mounting positions of the gear units are indicated with a * in
chapter Mounting position sheets.
•
A high mean input speed and thus a high circumferential velocity of the gear
wheels of the input gear stage.
If one or both requirements are met, determine the requirements of the application and
the corresponding operating conditions (see chapter
"
Data for calculating the thermal
)) and contact SEW‑EURODRIVE. SEW‑EURODRIVE can calculate
the thermal rating based on the actual operating conditions. The thermal rating of the
gear unit can be increased by appropriate measure e.g. by using a synthetic lubricant
with higher thermal endurance properties.
INFORMATION
To reduce churning losses to a minimum, use gear units preferably in M1 mounting
position.
7.2.1
Data for calculating the thermal rating
The following information is required for calculating the thermal rating:
Gear unit type and design:
•
Gear unit ratio i
•
Mean input speed n
Mot
or mean output speed n
G
in min
-1
•
Effective motor torque M
Mot_eff
in Nm
•
Input motor power P
Mot
in kW
•
Mounting position M1 – M6 or pivoting angle
Installation site:
•
Ambient temperature T
amb
in °C
•
In small, closed rooms or in large rooms (halls) or outdoors
Installation on site:
•
Space-critical or well ventilated
•
Steel or concrete base
7.3
Change of mounting position
INFORMATION
Do not change the mounting position without prior consultation with
SEW‑EURODRIVE.
The information on the nameplate is binding. The ATEX EU declaration of conformity
and the guarantee no longer apply if the mounting position is changed without prior
consultation with SEW‑EURODRIVE. Changes to the mounting position must be pro-
jected and indicated on the nameplate.
24804134/EN – 05/2018
