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1-7. Using external input/output
1. External signal input (CN2)
*To use external input, an external input/output adapter (PAC-YT51HAA; sold separately) is required.
(1) External signal input
Using external dry contact signals, the following operation of all air conditioning units can be controlled from the AT-50B: Emergency stop/Normal
operation, ON/OFF, Permit/Prohibit local remote controller operation. These settings are made on the External Input Settings on the Initial Settings
screen that is accessible from the Service Menu. (Refer to section 2-3.)
(2) Level signal and pulse signal
(A) Level signal
(B) Pulse signal
(3) External input specifications
(A) Level signal
• If [Emergency stop (Level signal)] is selected, the air conditioning units in normal operation will stop when the contact turns on. Conversely,
the units that are stopped will resume normal operation when the contact turns off. The units must be started up manually after the
emergency stop is reset.
• If [ON/OFF (Level signal)] is selected, the air conditioning units that are stopped will start operation when the contact turns on. Conversely,
the units that are in operation will stop when the contact turns off.
(B) Pulse signal
• If the incoming signal is the same as the signal that is currently being received, no status change will occur.
• If local remote controller operation is prohibited, ON/OFF, operation mode, set temperature, filter sign reset, fan speed, and air direction
settings will be prohibited, and also timer (schedule) settings from the local remote controllers will be deactivated. Depending on the models
of the connected air conditioning units and remote controllers, operation of some of the items above may not be disabled.
• The ON-signal pulse width should be set to a value between 0.2 and 1 seconds.
Mode
External input setting
Notes
1
Not used (Factory setting)
Select this mode when not using an external signal input function.
2
Emergency Stop (Level signal)
Using a level signal, all the air conditioning units will be stopped collectively in an
emergency. During an emergency stop, the ON/OFF operation from the local remote
controllers will be prohibited, and the ON/OFF operation and Prohibit/Permit settings on
the AT-50B will be prohibited. Scheduled operation will not be performed.
3
ON/OFF (Level signal)
Using a level signal, all the air conditioning units will be run or stopped collectively. The
ON/OFF operation from the local remote controllers will be prohibited, and the ON/OFF
operation and Prohibit/Permit settings on the AT-50B will be prohibited. Scheduled
operation will not be performed.
4
ON/OFF/Prohibit/Permit (Pulse signal)
Using a pulse signal, all the air conditioning units will be run or stopped collectively, or the
operation from the local remote controllers will be prohibited or permitted collectively.
CN2
Lead wire
Emergency Stop (Level signal)
ON/OFF (Level signal)
ON/OFF/Prohibit/Permit
(Pulse signal)
1
Green
Built-in 5 VDC power for external input
* Exclusively for use with external input. Not usable for other purposes.
2
Yellow
Emergency stop/Normal operation
signal input
ON/OFF signal input
ON signal input
3
Orange
Not used
Not used
OFF signal input
4
Red
Not used
Not used
Prohibit-local-remote-controller-
operation signal input
5
Brown
Not used
Not used
Permit-local-remote-controller-
operation signal input
*Same for Prohibit/Permit remote controller operation.
Contact ON
Contact OFF
Contact ON
Contact OFF
Contact ON
Contact OFF
Contact ON
Contact OFF
Run
Stop
Stop
Run
Stop
Stop
(ex.)ON/OFF
Signal 1 (ON)
Signal 2 (OFF)
0.2 to 1 seconds
0.2 to 1 seconds
Normal
operation
Normal
operation
Emergency
stop
WT06990X04_GB.book 7 ページ ２０１８年５月２２日 火曜日 午後１時５５分
