Elmo Rietschle F-REL - Manual (Page 23)

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Malfunctions: Causes and elimination
8 Malfunctions: Causes and elimination
Fault Cause Troubleshooting Important
Machine is
switched off
by the motor
protection
switch Mains voltage/ Frequency
does not correspond with the
motor data Check by qualifi ed electrician Section 5.5
Connection to motor terminal
board is not correct
Motor protection switch is not
set correctly
Motor protection switch is
triggered too quickly Use a motor protection switch with an
overload-dependent delayed switch
off that takes into consideration the
short term excess current at start up
(version with short circuit and over-
load trigger as per VDE 0660 Part 2
orIEC 947-4)
Blower operates without con-
nection to a system Connect system Section 5.3
Section 6.2
Motor rating selected was too
small If available use a blower with the next
motor size (exchange of the motor only
is not possible) Data sheets
D 750 - D 753
D 760 - D 763
Insuffi cient
suction or
pressure ca-
pacity Motor rating selected was too
small If available use a blower with the next
motor size (exchange of the motor only
is not possible) Data sheets
D 750 - D 753
D 760 - D 763
Lines are too long or too nar-
row Check the hose or the pipe Section 5.3
Machine or system leaking Check the pipework and screw con-
nections for leaks and to ensure that
they are fi rmly seated Section 7.2
Machine gets
too hot Ambient or intake temperature
is too high Ensure it is being used properly Section 2.3
Blower sucks too little air Check the rotation direction resp. cross
sections of the pipes Section 6.1.1
Section 5.3
Cooling air supply is obstruct-
ed Check environmental conditions Section 5.1
Clean ventilation slots Section 7.2
Unacceptable
noise Exhaust noise when used as
a vacuum pump or inlet noise
when used as a compressor Use an additional silencer ZSD (op-
tional extra) Data sheets
Z 926, Z 927
Please contact Elmo Rietschle Service for other malfunctions or those that cannot be eliminated.