Using An Sd Memory Card; Optional Parts - Mitsubishi Electric AT-50A Installation Manual

• The relays and extension cables are field supplied.
• Use a no-voltage contact and minute load relay (minimum application load 5VDC-1mA).
• The length of the connection cable extension should not exceed 10 m (32 ft). (Use a cable of 0.3 mm² (22AWG) or thicker.)
• Insulate the area with vinyl tape where the controller cable and the extension cable are connected.
• Insulate the end of unused lead wires with tape.
2. External signal output
*To use external output, an external input/output adapter (PAC-YT41HAA; sold separately) is required.
Requires a separate external power source.
(1) External signal output (CN3)
Operation signal will be output when one or more air conditioning units are in operation, and error signal will be output when one or more units are
in error.
The On-signal will be output even during an error.
(2) External output specifications
CN3 Lead wire
1 Brown
2 Red
(3) Sample circuit recommended
Relay-driven circuit
CN3
Brown
1
Red
2
Orange
3
Yellow
4
Maximum
10 m
AT-50A
(32 ft)
Note
• To connect cables from an external input/output adapter to connectors CN2 and CN3 on the controller, cut out the appropriate knockout
holes on the controller with nippers.
After connecting the cables to the connectors, hold the cables in place with a piece of tape included with the external input/output
adapter (PAC-YT41HAA).
• Use caution not to damage the circuit board with the nippers or other tools when cutting out knockout holes.
Cut out the
knockout holes.

1-8. Using an SD memory card

The AT-50A has a slot for an SD memory card at the bottom that
can be used to update software.
Refer to the Installation Manual for the detailed information about
updates.
*Only the 1GB and 2GB SD memory cards by SanDisk are
supported.
"SD Logo is a trademark of SD-3C, LLC."

1-9. Optional Parts

Parts
External input/output
adapter
1-10. Note
A protective film is placed on the display.
Remove the protective film off the display before use.
Signal
ON/OFF
Error/Normal
Diode (*2)
L1
Z1 Z1
Z2
Z2 L2
Power source
(*1)
L1 : Operation indicator
L2 : Error indicator
Field supplied
Model
PAC-YT41HAA Enables the use of external
input/output function
CN3
3
4
Use relays that meet the following specifications for relays indicated as Z1 and Z2 in
the figure.
Operating coil
Rated voltage: 12 VDC or 24 VDC
Power consumption: 0.9 W or below
(*1) Select a power supply suitable for the relays used. (12 VDC or 24 VDC)
(*2) Use a diode at each end of the relay coil.
• Each element will turn on when an error occurs during operation.
• The maximum length of extension cable is 10 m (32 ft). (Use a cable of 0.3 mm²
(22AWG) or thicker.)
• Insulate the area with vinyl tape where the controller cable and the extension
cable are connected.
• Relays, lamps, diode, extension cables are field-supplied.
Back of controller
CN2
External input connector
CN3
External output connector
(a)
(b)
(c)
(a) Remove the SD memory card slot cover from the controller.
(b) Insert the SD memory card into the slot until it clicks.
(c) To remove the SD memory card, push it in until it clicks.
Usage
Required to use the external input/output function
5-wire cable (input) , 4-wire cable (output)
– 8 –
Lead wire
Orange Ground for all external outputs
Yellow
Bottom of controller
SD memory slot (for program updates)
Note
Signal
Not used
Tape
External
input/output adapter