Maintenance Intervals; Maintenance Tasks; Troubleshooting And Possible Solutions - Wilo EMU KS Serie Instrucciones De Instalación Y Funcionamiento

8.1.2 Filling quantities
Type
KS 8, KS 9, KS, KS
14
KS 12, KS 15
KS 20
KS 24
KS 37, KS 70
KS 220
KS...Ex
8.1.3 Overview of greases
The following can be used as grease in accordance with
DIN 51818/NLGl class 3:
• Esso Unirex N3
• SKF GJN
• NSK EA5, EA6
• Tripol Molub-Alloy-Food Proof 823 FM*

8.2 Maintenance intervals

Overview of the maintenance intervals needed
If used with highly abrasive or corrosive media,
the maintenance intervals should be reduced by
50%!
8.2.1 Before initial start-up or after a longer period of
storage
• Check the insulation resistance
• Functional inspection of safety and control devices
8.2.2 8,000 operating hours or after two years
• Change the lubricant (recommended)
8.2.3 15,000 operating hours or after five years, whichev-
er is earlier
• General overhaul

8.3 Maintenance tasks

8.3.1 Checking the insulation resistance
To check the insulation resistance, the power supply
cable must be disconnected. The resistance can then
be measured with an insulation tester (measuring volt-
age = 1,000 V). The following values may not be
exceeded:
• For the initial start-up: Minimum insulation resis-
tance 20 M:.
• For further measurements: Value must be greater
than 2 M:.
If the insulation resistance is too low, moisture
may have penetrated the cable and/or the motor.
Do not connect the machine, consult manufac-
turer!
8.3.2 Functional inspection of safety and control devices
Monitoring devices are temperature sensors in the
motor, sealing room monitors, motor protection relays,
overvoltage relays, etc.
Installation and operating instructions Wilo-EMU KS.../KS...Ex
Sealing chamber Motor
200 ml 900 ml
140 ml 820 ml
400 ml 1300 ml
350 ml 1350 ml
1400 ml 3000 ml
1000 ml -
550 ml -
Motor protection and overvoltage relays and other trip
elements can generally be triggered manually for test
purposes.
To inspect the sealing room monitor or the tempera-
ture sensor, the unit must be cooled to ambient tem-
perature and the electrical supply cable of the
monitoring device in the switch cabinet must be dis-
connected. The monitoring device is then tested with
an ohmmeter.
The following values should be measured:
• Bi-metal sensor: Value = "0"-throughput
• PTC sensor: A PTC sensor has a cold resistance of
between 20 and 100 ohms.
• For 3 sensors in series, this would result in a value of
between 60 and 300 ohms.
• For 4 sensors in series, this would result in a value of
between 80 and 400 ohms.
• PT 100 sensor: PT 100 sensors have a value of
100 ohms at 32 °F (0 °C). Between 32 °F (0 °C) and
212 °F (100 °C), this value increases by 0.385 ohms per
1°C. This gives a value of 107.7 ohms at an ambient
temperature of 68 °F (20 °C).
• Moisture sensor: This value must go towards infinity. If
there is a low value, there is water in the oil. Also
observe the instructions of the optionally available
evaluation relay.
In the case of larger deviations, please consult
the manufacturer!
8.3.3 General overhaul
During a general overhaul, the bearings, shaft seals,
O rings and power supply cables are inspected and
replaced as required in addition to normal maintenance
work. This work may only be conducted by the manu-
facturer or an authorized service workshop.
8.4 Changing the lubricant
We recommend changing the lubricant on these units
after 8,000 operating hours or two years. If you wish to
change the lubricant, please contact Wilo customer
service. They can then change the lubricant on-site or
provide you with the necessary information.
8.5 Repairs
The following repairs can be carried out on this unit:
• Replacement of the hydraulic part
• Replacement of the impeller
Instructions on replacing the individual parts are
included with the replacement part!

9 Troubleshooting and possible solutions

In order to prevent damage or injury while rectifying
product faults, the following points must be observed
in all cases:
• Only attempt to rectify a fault if you have qualified
staff. This means that each job must be carried out by
trained specialist staff. For example, electrical work
must be performed by a trained electrician.
• Always secure the product against an accidental restart
by disconnecting it from the mains. Take appropriate
safety precautions.
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