Edition: 11/2007
Technical Instructions
Commissioning and Maintenance Guide
TAM 00 526
Page 7 / 18
2 Information about the Product
2.1 Motor Type, Product Number and Technical Data
Refer to the rating plate on the motor for this information.
2.2 Types of Ventilation
Type GNA
With mounted radial fan, direction of cooling air from B to A
Standard ventilation version
A side B-side
2.3 Cooling
Type GNA machines have a radial fan that is either mounted on top or on the side. The cooling air is
taken in here at the fan's suction head and blown diametrically into the motor space, it is then diverted
towards the shaft and blown out through the lateral openings on the end shield opposite.
Type AGN machines have a radial fan that is axially mounted on the B side. The cooling air is taken in at
the fan's suction head and pressed through the machine towards the shaft and blown out through the lat-
eral openings in the A end shield.
If a separate cooling unit is connected, the intake and exhaust openings have a connection option for
pipe connection pieces. This type is identified as fGN in this case. The machine corresponds to protection
type IP 23 in the case of a pipe connnection on one side and a free exhaust opening; in the case of a
pipe connection on both sides and a free exhaust opening, the machine has protection type IPR 44. The
connection option for pipe connection pieces is also available for motors with mounted separately driven
fans.
With force-ventilated motors, the cooling air volume remains constant regardless of the DC motor's
speed. For this reason, you may continuously run these motors at the rated torque right down to the low-
est speed values.
The machine achieves the maximum type rating (GNA rating) when the necessary cooling air volume has
been raised and taken in on the B side.
If the cooling air is contaminated, it is vital to mount a fine dust filter. At the
same time, you should install a heat monitoring relay to protect the motor from
heating up above allowed limits.
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