4
Mechanical installation
Gear units/gearmotors in explosion-proof design II2GD and II3GD
Assembly and Operating Instructions – Explosion-Proof Gear Units
30
4.2
Gear units/gearmotors in explosion-proof design II2GD and II3GD
INFORMATION
•
Explosion-proof gear units and gearmotors of the R..7, F..7, K..7, K..9, S..7, and
SPIROPLAN
®
W series comply with the design requirements for equipment group
II, categories 2G (potentially explosive gas atmosphere) and 2D (potentially ex-
plosive dust atmosphere). These units are intended for use in zones 1 and 21.
•
The explosion-proof gear units of the R..7, F..7, K..7, K9, and S..7 series with AR
adapter (adapter with slip clutch) comply with equipment group II, categories 3G
(potentially explosive gas atmosphere) and 3D (potentially explosive dust atmo-
sphere). These units are intended for use in zones 2 and 22.
4.2.1
Ambient temperature
If no deviating data is given on the nameplate, gear units in explosion-proof design
may only be used at ambient temperatures in the range from -20 °C – +40 °C.
If an attached component limits this temperature range, the data on the components
nameplate applies.
INFORMATION
Any ambient temperatures deviating from this range are listed on the nameplate.
4.2.2
Temperature class
Mains-operated gear units/gearmotors in category II2G (potentially explosive gas at-
mosphere) are approved for temperature classes T3 to T6 depending on their speed,
reduction ratio and mounting position.
The temperature class of the gear unit is specified on the nameplate.
To define which stand-alone gear units and which 4-pole gearmotors operated with in-
verters can be used in an application, contact SEW‑EURODRIVE.
4.2.3
Surface temperature
The surface temperature of gear units of category II2D is 120 °C or 140 °C depending
on speed, ratio and mounting position. Refer to the nameplate for the maximum sur-
face temperature of the gear unit.
The system operator must guarantee that a possible accumulation of dust will not ex-
ceed a maximum thickness of 5 mm, in accordance with EN 50281-1-2.
4.2.4
Degree of protection
The degree of protection for the gear unit design is IP65 according to EN 60529. Devi-
ating information is specified on the nameplate.
4.2.5
Ambient conditions
The gear unit must be sufficiently ventilated. No external heat generation (e.g. via
couplings, flanges or shafts) must be present.
24804134/EN – 05/2018
