Troubleshooting - Hitachi PC-ARF Technical Catalogue

7 Gateways for building management systems
HARC-BX E

7.4.6 Troubleshooting

The following table shows the possible troubleshooting actions to be carried out in the event of unit malfunction.
Make sure that the power supply is disconnected before starting any check.
No. Phenomenon
Check that the electricity cable is connected.
Check that it supplies electricity.
Check if the power supply is turned on (PWRs
The HARC-BX
ON).
E does not start
Check whether the screws on the power supply
up although the
are loose.
power supply is
1
turned on.
Check if the LED (PWR or transmission display)
(No indication in
is on.
the 7-segment
display).
Check if the LED (LON or transmission display)
is on.
Check if the LED (LON or transmission display)
is flashing at regular intervals (from 1 to 2 sec.).
Check if the HARC-BX E (OP) DIP switches are
correctly configured.
Check if the air conditioning system and ad-
dress are correctly configured.
The HARC-BX E
Check if the transmission cable to the air condi-
does not identify
tioning units is disconnected.
the air condition-
Check if the transmission cable specified by the
ing even though
manufacturer has been used to connect to the
the power supply
air conditioning units.
is on.
Check if the transmission cable connected to
("11" appears on
the air conditioning is connected to the power
the 7-segment
supply cable.
display).
2 Check if the termination resistance of the termi-
After the "00"
nal and the number of the transmission cable to
indication on
the air conditioning unit is correctly configured.
the 7-segment
Check if the transmission circuit operates nor-
screen with test
mally with the self-check function.
mode, the ac-
tual amount of air
Check if the air conditioning's power supply is
conditioning units
ON.
does not match
Check if the transmission cable between the air
with these ad-
conditioning units is disconnected.
dresses.
Check if the LED (H-L) of the transmission dis-
play is on.
Check if the LED (H-L) of the transmission dis-
play is off.
688 688
TCGB0106 rev.0 - 12/2014
Check points Action
Connect the electricity cable.
Measure the power supply voltage. If the voltage meas-
urement exceeds the normal range of 100~240±10%[V],
the wiring systems and procedures should be inspected
and examined.
If the pilot light is off there may be a fault in the internal
power supply. Contact your nearest service centre.
Tighten them.
Check the transmission circuit of the air conditioning
systems with the self-check function. Then check if the
monobloc air conditioning transmission circuit is operat-
ing normally.
Check the upper transmission circuit with the self-check
function. Then check if the upper transmission circuit is
operating normally.
The flashing indicates that there could be a fault in the
internal power supply. Contact your nearest service
centre.
The DIP switch must be configured again following the
installation and maintenance manual and operation
manual on how to configure the HARC-BX E DIP switch.
The address should be configured again as indicated in
the installation and maintenance manual and the opera-
tion manual.
Examine the cable connection.
Use a shielded cable or twisted and shielded pair cable
(0.75 mm ).
2
Leave a minimum space of 150 mm between cables.
Only one termination resistance should only be config-
ured on one system. (The resistance between cables is
approx. 150 Ω).
The termination resistance should be configured in rela-
tion to the air conditioning transmission cable.
The air conditioning should be in the ON position.
Examine the cable connection.
Check the transmission circuit of the air conditioning
system with the self-check function. Then check if the air
conditioning transmission circuit is operating normally.
Check the transmission circuit of the air conditioning
system with the self-check function. Then check if the air
conditioning transmission circuit is operating normally.