wtw IQ SENSOR NET System 2020 XT, Руководство по эксплуатации, Страница: 184 / 216

What to do if... System 2020 XT C
ONNECT
10 - 4
ba75970e01 10/2012
10.2.3 Tips for clearing errors in the voltage supply
Supply voltage not
present or in the warning
or error range
Admissible values for the internal voltage supply (+U) are
given in section 11.1.
Cause Remedy
– Number of power MIQ power
supply modules is not suffi
-
cient
– Check power rating. If neces
-
sary, install another MIQ power
supply module (for details of
how to do this, see
section 3.4.2 D
RAWING UP THE
POWER RATING
).
– Cable section is too long – Check length of the cable sec
-
tion. If necessary, install
another MIQ power supply
module (for details of how to do
this, see
section 3.4.3 E
FFECT OF THE
CABLE LENGTH
).
– Electrical connection
between MIQ power supply
module and component is
defective
(distributed mounting)
– Check cable connection step-
by-step starting with the
MIQ power supply module, and
replace defective cable sec
-
tions.
– Check contacts on the
MIQ modules (stack mounting).
Clean any dirty contacts. Care
-
fully bend back contact springs
that have been pressed flat or
bent (pay attention to sufficient
spring tension).
– Tighten on screws on the termi
-
nals.