1PQ8
Page1/2
MTR 4.2-007
Additional Operating Instructions for
Motors cooled by separately Driven Fans
Note: To be read in conjunction with the 1LA8 Motor manual.
Description
• Application
Electrical machines are fitted with a separate fan unit, when the cooling provided by the fan,
mounted on the rotor NDE extension, is insufficient, particularly at lower speeds. This
happens to machines operating at wide-speed range. In such cases, this fan is driven
through a separate motor called blower motor. The fan fits on an adaptor, which is fixed on
the blower motor extension. The blower unit assures effective cooling irrespective of the
speed of the main machine.
This blower fan unit is fixed to the fan cowl through a fixing plate offering low air resistance.
• General , Connecting Up
Connect up the blower motor, and
optional encoder, as shown in the
connection diagram in the terminal box,
with due regard to the associated
instructions and rating plate data.
• Dismantling, Assembly
1. Fan Cowl with Fan unit
Before the fan cowl is dismantled, the
grease nipple should be removed.
The fan unit needs to be removed only for
repairs.
2. Fan Cowl with Fan unit + Encoder
Before the fan cowl is removed, the
connections from the auxiliary box of fan
unit, encoder & the grease nipple should
be removed. The fan unit needs to be first
removed and the hex. nut fixing the torque
arm to the fan cowl should be removed.
The fan cowl can now be taken out.
During reassembly it should be ensured
that the fan rotates freely inside the cowl.
Connect up the blower motor, and
optional encoder, as given above.
17
Torque arm-optional
16 Encoder- optional
15 Coupling -optional
14 Washer
13 Hex screw
12
Terminal box- for 16
11
Terminal Box- for 2
10 Fan cowl
9 Washer
8 Hex screw
7 Fixing plate
6 Washer
5 Hex screw
4 Fan (plastic/steel)
3 Fan adaptor
2 Blower motor
1 Protection Cover
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