Grundfos Fire DNF, Инструкция по установке и эксплуатации

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English (GB)
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14. Maintenance
14.1 Maintenance intervals
Fire pump set
Visible check: Every six months.
Tightness of bolts, etc.: Every six months.
Alignment, motor and pump: Every six months.
Pump
Stuffing box: Every six months.
Gaskets: Every six months.
Lubrication of bearing: Every six months.
Replacement of bearings: Every six years.
Motor
Motor cables: Every six months.
Lubrication of bearings: Every six months.
Replacement of bearings: Every six years.
Fan: Every three years.
Coupling
Coupling guard: Once a week
Coupling assembly: Every six months.
Controller
Checking of wire connections: Every six months.
Visible inspection:
Every six months.
14.2 Fire pump set
A test run should be carried out once a week. See section
12.3 Test run
. The test should include the following tests:
• Start the pump with [START] button A2. See section
12.2.1 Manual operation with buttons [START] and [STOP]
.
• Start the pump with emergency start handle A4. See section
12.2.2 Manual operation with emergency start handle
.
• Simulate a phase reversal by pressing the [Alarm Reset]
button for more than 10 seconds, and check indication and
remote alarm.
• Start the pump via a remote signal, if possible.
• Start the pump via the flow switch (option A4).
Check the following:
• bolts for tightness and corrosion
• alignment of motor and pump (see section
9.9 Alignment
)
• any parts for corrosion, damage and wear.
14.3 Pump
Gaskets
Check the gaskets for leakage and wear.
Stuffing box
Check the packing carefully, allowing a slight leakage for
lubrication. Never force the packing into a leak-proof position, as
this will create excessive friction and cause damage to the
packing or shaft sleeve. Maximum packing life can be expected
with a leakage of minimum of 40 to 60 drops per minute.
A reduction of leakage considerably reduces the life of both the
packing and shaft sleeve. If leakage is excessive, tighten the
gland bolts evenly, about 1/6 of a turn at a time. Do not be
confused if the leakage seems to increase when the packing has
been adjusted. The leakage will normally reduce after a period of
time as the packing adjusts itself to its new position. It should be
kept in mind that it takes time for newly installed packing to "run-
in", and that during this initial period, frequent attention and
adjustments are necessary. It sometimes takes several days to
achieve the desired results.
To set the leakage rate of the stuffing box, remove the protecting
guards of the shaft on both sides. This gives access to the setting
screw. See service instructions.
Bearing lubrication
If the pump is provided with lubrication nipples, the bearings
should be relubricated once a year. Use lithium soap base,
worked penetration, meeting NLGI Grade 2 specifications.
Minimum dropping point: 180 °C (355 °F).
Operating temperature range: -23 °C to 116 °C (-10 °F to 240 °F).
The required amount depends on the bearing size. See service
instructions.
14.4 Motor
During the weekly test run, check the current drawn by the motor.
Lubricate the bearings once a year, and replace the bearings
every six years. Clean the fan every three years.
14.5 Coupling
Couplings with elastomeric drive parts do not require lubrication.
Check the coupling every six months and the coupling guard for
correct position once a week.
14.6 Controller
The following maintenance work must be carried out regularly, at
least every six months:
• Check wire connections. All screw connections on the
brackets and all frame connections must be checked to ensure
a secure fit. Any loose connections must be tightened.
Check all cables for visible damage and replace, if necessary.
This applies also for the cables at the motor and the signal
cables.
• Check that the controller is clean.
• Check the controller for corrosion outside and inside.
• Check for leaks in pressure sensor and pipework.
• Check the door and locks for proper function.
• Check relays, contactors and timers for damage.
• Check controller earthing.
• Check motor contactor power contacts.
• Check tightness of all nuts and screws.
• Check circuit breaker for interlock with the door.
Note
The operator is responsible for ensuring that all
maintenance, inspection and installation work is
performed by qualified personnel. A regular
maintenance plan will help avoid expensive
repairs and contribute to trouble-free, reliable
operation. It is recommended to place a
maintenance contract with Grundfos.
Warning
Before starting work on the pump, make sure that
the power supply has been switched off and
cannot be accidentally switched on.
Maintenance work must only be carried out by
qualified personnel.
Note
More detailed information about maintenance can
be found in the service instructions.
Note
Check that the control panel has returned to
normal operation after the test run.
Warning
Before opening the control cabinet, switch off the
power supply by means of the isolating switch.
Risk of electric shock!