Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 26

(B) Optional controls
• External input terminal
① 4 External input terminals (CnS1, CnS2, CnG1 and CnG2) are provided. (See fig-1)
② Each external input terminal can be changed its function by allotting the external input function No. of P11-P14 selected
with 7-segment respectively. (External input functions of the code P11-P14 are shown in fig-2)
Terminal
CnS1 No volatage contact (DC12V)
CnS2 No volatage contact (DC12V)
CnG1 No volatage contact (DC12V)
CnG2 No volatage contact (DC12V)
③
The following function is effective, when the external input function of PXX-"X" is allotted and the signal is input to the
external terminal of CnXX.
(Example) If CnS1 terminal is used for demand control (pulse input), allot the "1" of P11 and open J13, and if CnS2 terminal is
used for demand control (level input), allot the "1" of P12 and short J13.
(Note) More than one function cannot operate at same time.
Setting *1
Master unit
Master unit
Master unit
Master unit
Master unit
Master/Slave unit
Master unit
Master unit
Master unit
Master unit
*1 "Setting" means;
Master
Master/Slave: Set both master/slave unit same.
(1) External input and demand input (Master unit/Slave unit)
(a) Operation permission or prohibition mode
(Note) Following explanation is based on using CnS1 terminal and setting function [P11]-[0] with 7-segment display.
However other terminals can be used with following function setting of 7-segment display.
CnS2: [P12]-[0]
1) Opearation permission or prohibition mode is switched with the connector (CnS1) and the Jumper wire (J13) on the
outdoor control PCB after setting function [P11]-[0] (Factory setting) with 7-segment display
J13: Switching of CnS1 input method
J13 shorted: Level input by CnS1
J13 open : Pulse input by CnS1
2) Operation permission/prohibition control by the external input CnS1 to outdoor unit.
Open
Shorted
Note (1) Factory setting J13: Shorted, CnS1: Shorted (Short pin is connected)
3) The operation condition is displayed on the LCD of remote controller and it is transferred to optional centralized controller
4) When the operation command from remote controller is not accepted by this control, "Center" is displayed on the
LCD of remote controller. (See item 5 mentioned next page)
External input terminal
Specification
Allotment of external input function (P11-P14)
"0": External operation input
"1": Demand input
"2": Forced cooling/heating input
"3": Silent mode input 1
"4": Spare
"5": Outdoor fan snow protection control input
"6": Test run external input 1 (Equal to SW5-1)
"7": Test run external input 2 (Equal to SW5-2)
"8": Silent mode input 2
"9": Spare
: Set only the master unit. (No necessary to set the slave unit)
CnG1: [P13]-[0]
Input: CnS1
Shorted
Open
External input function allotment of 7-segement
Factory setting
Shorted
Shorted
Open
Open
Fig-1
External input terminal
Operation permission
Cooling test run
Fig-2
CnG2: [P14]-[0]
Switching CnS1
input method:J13
Shorted (Level input)
Open (Pulse input)
Shorted (Level input)
Open (Pulse input)
24
- -
Code Function No.
P11 "0"-"9"
P12 "0"-"9"
P13 "0"-"9"
P14 "0"-"9"
External input terminal
shorted
Operation prohibition
Invalid
Heating
Valid
-
Valid
Test run start Normal operation
Heating test run
Valid
-
CnS1: Switching operation
permission/prohibition mode
Operation prohibition mode
Operation permission mode
Switching operation permission/
Operation prohibitiion mode (Reversal)
Operation permission mode
Operation prohibition mode
—
(NOP)
Factory setting
"0"
"1"
"2"
"3"
open
Valid
Cooling
Invalid
-
Invalid
Invalid
-