Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 31

(6) Operation and error signal output (Master unit/Slave unit)
This is the function to retrieve and display the operation and error information on the outdoor unit as a batch.. Although
indoor units also have the function to retrieve the operation and error information, this function is designed to retrieve the whole
information of each refrigeration system connected to the outdoor unit.
(a) The terminals for the operation and error outputs at the outdoor unit side are provided on the outdoor control PCB.
(b) Diagram of output relay operations
Outdoor LED for inspection
(c) The error output relay (52XE) is turned ON when the error stop occurs, and is turned OFF when the error reset is done
from remote controller by pressing "Check" and "Reset" button simultaneously after recovery from the error (Remote
controller reset case ② ).
Before recovery from the error, if the error reset is done from remote controller, 52XE is not turned OFF, but it will be
turned OFF autmatically after the error is recovered subsequently (Remote controller reset case ① ).
(d) If at least one of connected indoor units is operating, the operation output relay (52XR) is turned ON. (Operation means
the state that remote controller is turned ON, in which the fan opertion and the thermostat OFF is included, but the error
stop is excluded.)
(e) Output relay (52XR, 52XE) of DC12V should be prepared in the field. The maximum load of relay is LY2F (Omron).
(f) The output connectors (CnH, CnY) to be connected to the relays for operation output (52XR) and for error output (52XE)
is mounted on the outdoor controll PCB.
(g) If CPU goes out of control, this function becomes disable.
(h) When the automatic backup operation is effective, there is no error display for any error on the compressor stopping by
detecting its anomaly.
ON
OFF
Error output 52XE
Normal
Presence of error
ON
OFF
Error
Case ②
Case ①
Error
Normal
Remote Remote
controller reset controller reset
Case ① Case ②
29
- -
Dip switch
Reset