Troubleshooting And Scrapping Criteria; General Safety Information; Operational Conditions Which Can Cause Pump Failures; Mechanical Failure - Danfoss APP 5.1 User Manual

User manual
8. Troubleshooting and

scrapping criteria

Installation, Operation and Maintenance APP Pumps (APP 5.1-10.2)

8.1 General safety information

Before inspecting the pump unit, it is necessary
to read and understand this user manual,
especially the Safety chapter 2 .
Remember to wear suitable safety equipment
according to Safety chapter 2 .
8.2 Operational conditions which can cause
pump failures
The following conditions can cause a pump
failure :
• The pump is running dry.
• The inlet pressure is too high.
• The inlet pressure is too low.
• The viscosity of the fluid is too high.
• T he temperature of the fluid being
pumped is too high .
• The ambient temperature is too high.
• T he pump is running against a blocked
port/closed manual valve .
• T he pump is operating at a pressure above
the operational specification .
• T he pump is running with a non-specified/
approved fluid .
• T he pump is running in the wrong
direction .
• The filtration is insufficient.
• T he pump is not being serviced according
to Danfoss specifications (end of life) .
• T here is excessive mechanical load on the
shaft coupling and piping .

8.3 Mechanical failure

If the pump is running dry, the temperature will
quickly increase which can be dangerous,
depending on how long time the pump is
running dry .
If there is any leaking at start up or leaking arises
during operation, the high pressure can lead to
eye or skin damage .
Leaking can result in flooding, which again can
cause a risk of slipping, tripping or falling .
If water is dripping into the electric motor; it can
lead to electric shock, fire, short of circuit or even
death . In order to avoid water dripping into the
electric motor, see Installation and commission-
ing, chapter 5 and Operation, chapter 6 .
Electrical
hazard

8.4 Electrical failure

If the wiring/connection of the electric motor is
not correct or the earth connection is missing, it
can lead to electric shock, burn damages, fire or
even death .
180R9263 / IOM APP Pumps - v01 / 01.2013
If a VFD is used and wrongly programmed, it can
damage the pump and lead to high tempera-
tures or other dangers .
Therefore all electrical installation work must
only be carried out by authorized personnel in
accordance with EN60204-1 and/or local
regulations .

8.5 Responsibility

Danfoss takes no responsibility for any other
abnormal injuries, risks or damages that could
arise caused by abnormal conditions, vibrations,
corrosion, abrasives, foreign objects or excessive
temperatures and shall not be liable for any
consequential or incidental damages .
8.6 Scrapping criteria
Whether the pump can be repaired or need to be
scrapped depends on how damaged the internal
parts are or how damaged the whole unit is .
Please use appendix 6, Trouble shooting guide as
guideline or send the pump to Danfoss head-
quarter in Denmark for evaluation .
For other observations or troubles, please see
appendix 7, Right and Wrong which gives good
advises in design, installation, wiring and
troubleshooting .
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