Hitachi HARC70-CE1 Manuel D'installation Et De Fonctionnement page 15

SERVICE AND CHECKING FOR HARC70-CE1 (OP)
Nº Phenomenon
Indication of 7-segment
3 shows "44".
(Only HARC70-CE1)
Indication of 7-segment
shows "61". After identify the
address of chiller unit having
4 abnormal transmission with
Check mode, check as
described in the right side to
the appropriate chiller unit.
Control function of chiller
unit over the upper
5
equipment does not
activate. (entire control)
Indication of 7-segment of
control PCB in chiller unit
shows "03" alarm.
6
(transmission abnormality
between HARC70-CE1 (OP)
and Chiller unit)
Items to be checked
Check if manufacturer's specified
transmission cable connected with chiller
unit is used.
Check if transmission cable connected with
chiller unit is wired along power source wire.
Check if end terminal resistance and
quantity on the transmission cable between
chiller unit and HARC70-CE1 are set
correctly with chiller unit.
Check if transmission circuit is operating
normally upon the self-inspection.
Check if the power source of chiller unit is
ON.
Check if manufacturer's specified
transmission cable connected to chiller unit
is used.
Check if transmission cable connected with
chiller unit is wired along power source wire.
Check if end terminal resistance and
quantity on the transmission cable between
chiller unit and HARC70-CE1 (OP) are set
correctly with chiller unit.
Check if transmission circuit is operating
normally upon the self-inspection.
Check if the power source of chiller unit is
ON.
Check if chiller unit is set in local mode.
Check if manufacturer's specified
transmission cable connected to chiller unit
is used.
Check if transmission cable connected with
chiller unit is wired along power source wire.
Check if end terminal resistance and
quantity on the transmission cable between
chiller unit and HARC70-CE1 (OP) are set
correctly with chiller unit.
Check if transmission circuit is operating
normally upon the self-inspection.
Check if the power source of
HARC70-CE1 (OP) is ON.
/
11
6
Actions
Use Twist pair cable
2
(0.75mm ).
Provide a space of at
least 150mm between
wires.
Only one end resistance
should be set in one
system. (Resistance
between wire will be
approx. 150Ω.)
End resistance should be
set to the transmission
wire of chiller unit.
Chiller unit should be
turned ON.
Use Twist pair cable
2
(0.75mm ).
Provide a space of at
least 150mm between
wires.
Only one end resistance
should be set in one
system. (Resistance
between wire will be
approx. 150Ω.)
End resistance should be
set to the transmission
wire of chiller unit.
Chiller unit should be
turned ON.
Chiller unit should re-set
to
remote mode.
Use Twist pair cable
2
(0.75mm ).
Provide a space of at
least 150mm between
wires.
Only one end resistance
should be set overall.
(Resistance between wire
will be approx. 150Ω.)
End resistance should be
set to the transmission
wire of chiller unit.
HARC70-CE1 (OP)
should be turned ON.