Mitsubishi Electric GB-50A Installation Manual page 18

(2) Level signal and pulse signal (DC12V or DC24V)
(3) External input specification
CN2 Lead wire
No.5 Orange Emergency stop/normal input
No.6 Yellow Not used
No.7 Blue Not used
No.8 Gray Not used
No.9 Red External DC source "+"
(A) For level signal
1 When the emergency stop/normal signal is selected, the status will change from normal to emergency
stop when the external input signal contact changes from OFF to ON, and will change from emergency
stop to normal when the contact changes from ON to OFF. Emergency stop signal will bring the air
conditioners to stop, and canceling the emergency stop will not automatically reset these units. To go
back to the previous operation status, they must be manually turned back on.
2 When the ON/OFF signal is selected, the status will change from OFF to ON when the external input
signal contact changes from OFF to ON, and will change from ON to OFF when the contact changes
from ON to OFF.
(B) For pulse signal
1 Even if the ON signal is input during ON, the status will remain ON.
2 If the local remote controller is prohibited, the ON/OFF operation mode and temperature setting
operations by the local remote controller will be prohibited.
3 Set the pulse width (contact ON time) to 0.5 to 1 sec.
(4) Recommended circuit example
1 The contact relay, DC power source, extension cable, etc, must be prepared separately at the site.
2 The connection cable can be extended up to 10m (32 ft). (Use a 0.3mm2 (AWG 22) or larger wire.)
3 Strip the extra cable near the connector, and securely insulate the exposed section with tape, etc.
Emergency stop/normal level
signal
ON/OFF,
ON/OFF, prohibit/enable pulse signal
level signal
ON/OFF input ON input
Not used OFF input
Not used Local remote controller operation prohibit input
Not used Local remote controller operation enable input
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