CMG Motors / SGA
/HGA
31
Maintenance instructions
The following maintenance instructions apply to all SGA
/
HGA
motors except for hazardous location motors.
For
SGAE
,
SGAN
and
SGAD
motors maintenance must
be
carried out by an authorized service
agent.
Contact CMG for detailed instructions.
To obtain maximum service life from your electric motor,
it is recommended the following maintenance be
implemented and recorded in a plant log book.
A
. Ensure air intake space is unobstructed.
B
. On a weekly basis use an air hose to ensure all
airways are clear and free of dust.
C
. Do not wash the motor down unless it is
IP66
rated.
D
. On a quarterly basis-
i)
Check motor terminals for tightness and contact.
ii)
If terminal lug/lugs are discolored, re-terminate.
iii) Check operation of starting equipment, ensuring
all terminations are tight.
iv) Check mechanical operation of thermal overload.
v) Check mechanical operation of thermistor relay (if
fitted).
vi) Check operation of space heaters (if fitted).
E
. On a six (6) monthly basis, in addition to the items in
'D' -
i)
Check stator resistance (compare to original and
enter in log book)
ii)
Check supply voltage at motor terminals.
iii) Check bearings for noise/overheating.
F
. On an annual basis, in addition to the items in 'D' and 'E'-
i)
Re-grease bearings in line with chart below.
Note: As indicated in the chart, some bearings may
require more frequent grease replacement.
ii)
Strip motor down and clean thoroughly.
iii) Check bearings for wear/damage - replace as
necessary.
iv) Check all machine bolts for cracks or damage -
replace as necessary.
v) Check all holding bolts for signs of
fatigue/damage - replace as necessary.
vi) After re-assembly, check and record:-
Full
Load
Current
Full
Load
Voltages
Full
Load
Speed
vii) Ensure cooling fan is operational
G
.
Ensure plant log book records commissioning data
and compare maintenance data with original.
Sealed bearings
The required replacement interval for sealed bearings is
generally determined by the grease life which is
dependant on operating temperature, operating speed,
the limiting speed of the bearing and the type of grease.
Under normal operating conditions the following
relationship applies:-
n n
log
t
= 6.54 – 2.6
N
– (0.025 – 0.012
N
)
T
Where:
t = Average grease life (hours)
n = Speed (RPM)
N = Bearing limiting speed with grease lubrication (RPM)
T = Operating temperature (°C)
For further information, please contact your nearest
CMG office for advice.
Open (regreasable) bearings
Recommended Grease Replenishment Intervals (Hours)
1)
3000 r/min
1500 r/min
1000 r/min
750 r/min
Bearing
number
Bearing
bore
[mm]
Qty of
grease
[g]
Ball Roller
Ball
Roller
Ball
Roller
Ball
Roller
6312/NU312 60
20
3800
1900
10100 5050
16000 8000 20000 10800
6313/NU313 65
25
3400
1700
9400 4700
15100 7500 20000 10300
6314/NU314 70
30
3000
1500
8800 4400
14300 7150 19500 9750
6315/NU315 75
30
2570
1285
8200 4100
13500 6750 18500 9250
6316/NU316 80
35
2200
1100
7600 3800
12800 6400 17700 8850
6317/NU317 85
40
1800
900
7100 3550
12100 6050 16800 8400
6318/NU318 90
45
1650
825
6600 3300
11500 5750 16000 8000
6319/NU319 95
45
1500
750
5700 2850
9000 4500 14600 7300
6322/NU322 110
60
1200
600
4800 2400
8300 4150 13400 6700
1)
Based on maximum grease service life of 20,000 hours.
It should be noted that for motors fitted with Ball and
Roller bearings, the lubrication intervals for both
bearings should be based on the roller bearing data.
The re-lubrication intervals recommended are calculated
on the basis of normal working conditions.
Note: Air operated grease guns should not be used.
Replenishment of grease media should be by means of
a hand held grease gun whilst motor is running with
relief plate removed.
Recommended lubricant
Use Lithium based grease such as Shell Alvania R3
unless otherwise specified. (
SGAH
,
SGASS
and
SGAHS
require extra high temperature grease,
Magnalube G or equivalent.)
Goodnal STP ST041 Disinfection & Outfall (KSB Service Water Pumps Pu-1030-010/020/030 OM Instructions) Vendor Manual
Q-Pulse Id VM404
Active 29/10/2013
Page 32 of 42
