wtw MIQ/CHV, Руководство по эксплуатации

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What to do if ... IQ S
ENSOR
N
ET
MIQ/CHV
5 - 2
5.2 Checking the voltage supply
The MIQ/CHV has two LEDs on the side for monitoring the supply volt-
age (Fig. 5-1).
Fig. 5-1 Voltage LEDs on the MIQ/CHV
The LEDs show the following states:
– Yellow lights up Operational voltage OK
– Red lights up Operational voltage in warning range. It is
possible that the valve may no longer open.
– No LED lights up Operational voltage in the range of error. The
valve no longer functions.
Diagnosing faults in the
voltage supply
20
01 75
9
US
CAN
/C
SA STD C22.2 NO
. 1
010
CER
TIFIED
TO
UL STD
3101
CON
FO
RMS
TO
Ser
.-Nr
. 9999 9999
Po
we
r !
OK
WTW
MIQ
Po
we
r
!
OK
Cause Remedy
– Too many MIQ/CHV on one
power supply module
– Install another power supply
module and, if necessary, split
the installation
– Cable too long for distributed
mounting (voltage drop too
large)
– Install another power supply
module and, if necessary, split
the installation
– Electrical connection
between the power supply
module and MIQ/CHV is
defective
(distributed mounting)
– Check the cable connection
step-by-step starting with the
power supply module, and
replace any defective cable
sections.
– Check the contacts on the MIQ
modules (stack mounting).
Clean any dirty contacts.
Carefully bend back contact
springs that have been pressed
flat or bent (pay attention to
sufficient spring tension).