Siemens Simotics - Page 54

Faults and their rectification
Planetary gearboxes for servomotors
52 Operating Instructions, 09/2020, A5E50494253B AA
Table 7- 1 Possible faults
Fault
Fault cause (see "Fault causes and remedial measures"
key table)
Geared motor fails to start
A
B
T
Geared motor only starts slowly with
difficulty
A
C
F
T
Humming sound when starting
C
F
Humming sound in operation
A
C
F
High temperature rise under no-load
operation
D
I
High temperature rise under load
A
C
I
High temperature rise of individual
winding sections
F
Uneven running
J
K
R
Grinding sound, running noise
L
R
Radial vibrations
M
N
O
P
R
Axial vibrations
O
Q
R
Temperature too low
S