Fault Of Inverter Unit (Back-Up Set-Up Of Master Outdoor Unit) - Toshiba HFCR407C Service Manual

Fault of inverter unit (back-up set-up of master outdoor unit)

Outline
When an inverter unit fails, firstly perform emergency process according to the following work procedure, and then perform
emergency operation by a fixed-speed unit only.
Work procedure
(1) First, turn off the power source of all the outdoor units which are connected to the system.
(2) The following works are performed to the failed inverter unit.
1) Close service valve of gas pipe fully. (Fully close by turning clockwise)
2) If refrigerant leakage occurs on PMVB, close the service valve of the liquid pipe fully.
(Fully close by turning clockwise)
3) Check service valve of the balancing pipe is opened fully.
(Fully open by turning counterclockwise)
4) Remove "Short-circuit connector" connected to [CN604] on the interface PC board.
The removed "Short-circuit connector" is used for the fixed-speed unit. (Described in item (4) below.)
5) [In case of fault of compressor/fault of electric part system]
a. Works to the failed inverter unit is complete.
b.
Then, keep the power source OFF.
c. When central management remote controller is connected to the inverter unit, the central management
remote controller cannot be used.
6) [In case of fault of other cycle part system]
a. Set DIP SW06/Bit 1, 2, 3, 4 on the interface PC board to ON.
(LED display changes to U0)
b. Failed inverter work is complete.
c.
Then, turn on the power source to protect the compressor.
(Turn on winding heater)
d. The central management remote controller can be used as normal.
(3) Select a master outdoor unit among the fixed-speed units according to the following reference.
1) When only one fixed-speed unit is connected, select it as the master outdoor unit.
2) When two or more fixed-speed units are connected, select one connected to the nearest position of the inverter
unit as the master outdoor unit.
(4) Perform the following works for the fixed-speed unit selected as the master outdoor unit.
1) Insert "Short-circuit connector" into [CN604] on the interface PC board.
(One removed from the inverter unit as (2), 4))
2) Set DIP SW07/Bit 3 on the interface PC board to ON.
(Set-up to correct oil recovery capacity)
3) Set DIP SW08/Bit 2 on the interface PC board to ON.
(Set-up to select master outdoor unit)
(5) Turn on the power source of each outdoor unit.
(6) Emergency process is complete. The operation then starts by a command from the indoor unit.
15
Back-up operation
Emergency operation
124