Insulation Resistance - Siemens 1LA Operating Instructions Manual

Commissioning
Commissioning

Insulation resistance

WARNING
Only expert personnel should b
installations.
Before starting commissioning, install all covers that are designed to
prevent active or rotating parts from being touched, or which are
necessary to ensure correct air guidance and thus effective cooling.
WARNING
During measurement and immediately afterwards, some of the
terminals are at hazardous voltage le
With the power
applied.
Chec king the insu
CAU TION
The insulation re
nded periods of storage o
exte
oper ation. Before you
oper ating manual for the ins
Disc onnect any m
mea suring the in
NOTICE
If the critical insulation resistance is less than or equal to this value, the windin
must be dried or, if the fan is removed, cleaned thoroughly and dried.
Please note that the ins
of wa rm windings. The insulation resistance can only be properly assessed after
conversion to the reference temperature of 25 °C.
NOTICE
If the measured value is close to the critical value, you must check the insulation
resista nce at suitably frequent intervals.
Measure the minimum in ulation
when the winding tempera
insulation res istanc
full-scale resist ance va
Measure the critical insulation resistance at the operating temperature of the winding.
12
cables co
lation resista nce
sistance nee ds to
r per
begin measuring the insulation resistance, please r
ul ation
ain-circuit cables that are connected to the terminals before
sulation resistance.
ulation resistance of dried, clean windings is lower than that
s resista
ture i s betwe
e app ly at d iffe rent
lu e is reach ed (a
e entrusted with work on power
vels. Do
nnected, check that no voltage c
be checked prior to start-up and again after any
iods during which the equipment is not
resistance meter you are going to use.
n ce of th e wind
en 20 a nd 30 °
tem per atur es. W
ppro . 1 minute). x
Standard machines_Operating_Instructions_Compact
not touch th em.
an be
i ng to th e mach i ne encl
C . Other values f or the
he n m eas urin g,
56100000002001 EN, 01/2010
in
ead the
gs
o sure
wait u il the nt