Mitsubishi Electric PAC-SC50KUA User manual

Building Air Conditioning Control System
Power supply unit
Model: PAC-SC50KUA
Installation Manual
Before using the controller, please read this Installation Manual carefully to ensure
correct operation. Store this Installation Manual in a location that is easy to find.
Contents
1. Safety precautions .................................................. 1
2. Product feature........................................................ 2
1. Specification .................................................... 2
2. Appearance ..................................................... 2
3. Installation ............................................................... 3
1. Parts prepared at site ...................................... 3
2. Installation space and the direction ................. 3
3. Unit installation ................................................ 4
4. Wiring ...................................................................... 4
1. Cover Removal and Installation ....................... 4
2. Power line ........................................................ 5
3. DC Power Supply and M-NET Transmission
Line .................................................................. 5
5. Allowable length of M-NET transmission lines ........ 6

– 1 –
This manual describes the installation of the PAC-SC50KUA Power supply unit and wiring to the central controller and the air condi-
tioner units. For the information about how to install the central controller or the air conditioner units, see the installation manual for
them.
For your safety, first be sure to read 1 Safety precautions described below thoroughly and then install the PAC-SC50KUA correctly.
After reading this installation manual, keep it in a location that is easy to find, If the PAC-SC50KUA Power supply unit is going to be
operated by another person, make sure that this manual is given to them.
1 Safety precautions
Before installing this unit, make sure you read all the “Safety Precautions”.
The “Safety Precautions” provide very important points regarding safety. Make sure you follow them.
Symbols and Terms
WARNING Statements identify condition or practices that could result in personal injury or loss of life.
CAUTION Statements identify condition or practices that could result in damage to the unit or other property.
Ask your dealer or technical representative to install.
Any deficiency cased by your own installation may result in
an electric shock and fire.
Install in a place which is strong enough to withstand
the weight of the unit.
Any lack of the strength may cause the unit to fall down,
resulting in a personal injury.
Wire and connect using the desired cables securely so
that any external force from the cable is not imparted to
the terminal connections.
Imperfect connection and fixing may result in heating or fire.
Never modify or repair the unit by yourself.
Any deficiency caused by your modification or repair may
result in an electric shock or fire.
Consult with your distributor for repair.
Make sure that the unit is powered by a dedicated line.
Other appliances connected to the same line could cause
an overload.
Make sure that there is a main power switch.
A ready accessible breaker for power source line helps re-
duce the risk of electric shocks. Installation of a breaker is
mandatory in same area.
Ensure that installation work is done correctly follow-
ing this installation manual.
Any deficiency caused by installation may result in an elec-
tric shock or fire.
All electrical work must be performed by a licensed tech-
nician, according to local regulations and the instruc-
tions given in this manual.
Any lack of electric circuit or any deficiency caused by in-
stallation may result in an electric shock or fire.
Do not move and re-install the unit yourself.
Any deficiency caused by installation may result in an elec-
tric shock or fire.
Ask your distributor or special vender for moving and instal-
lation.
This appliance must be earthed.
Make sure to install a protective earth (PE) line.
Do not connect the protective earth line to gas or water pipes,
Iighting conductors or telephone grounding lines.
Improper grounding may cause an electric shock.
Specific Precautions
WARNING
CAUTION
Do no install any place exposed to flammable gas
leakage.
Flammable gases that accumulates around the body of the
unit may caused an explosion.
Do not use in any special environment.
If use in any place exposed to oil (including machine oil),
steam and sulfuric gas may degrade performances signifi-
cantly or damage the component parts.
Wire so that it does not received any tension.
Tension may caused wire breakage, heating or fire.
Do not wash with water.
Doing so may cause an electric shock or malfunction.
Do not install in any place at a temperature of more than
40°C or less than 0°C or exposed to direct sunlight.
Use only a fuse of specified capacity.
A fuse of large capacity or a steel or copper wire could cause
a malfunction or fire.
Do not install in any steamy place such as bath room or
kitchen.
Avoid any place where moisture is condensed into dew.
Doing so may cause an electric shock or a malfunction.
Do not install in any place where acidic or alkaline solu-
tion or special spray are often be used.
Doing so may cause an electric shock or malfunction.
Use standard wires in compliance with the current ca-
pacity.
A failure to this may result in an electric leakage, heating or
fire.
Do not touch any PCB (Printed Circuit Board) with your
hand or tools. Do not allow dust to collect on the PCB.
Doing so may cause fire or an electric shock.

–2 –
240
225
265
150 59.2
TB3
TB2
UP
POWER RATING
MODEL
WEIGHT
SERIAL No.
2.11kg
POWER SUPPLY UNIT
MITSUBISHI ELECTRIC CORPORATION
PAC-SC50KUA
2 Product feature
This unit supplies DC power to the central controller G-50A by means of the central controller system M-NET transmission line and DC
power line.
1. Specification
Source power requirement Input voltage AC220V~AC240V; 0.2A (Maximum loading) /50, 60Hz Single-phase
Fuse:2.0A Time-delay type (IEC127-2 S.S.5)
Output voltage/current M-NET: DC22V~24V 0.45A (Maximum loading)
DC power supply: DC12V 0.9A (Maximum loading)
Load capacity Number of the loading unit: G-50A Central Controller 1 unit
Environmental condition Temperature Operating 0~40°C
Non operating -20~60°C
Humidity 30~90%RH (No condensation)
Dimensions 240 (High) ✕265 (Width) ✕59.2 (Depth)
Weight 2.1kg
Installation Environment Indoor
Cable fixture
Cable fixture
TB1
2. Appearance

–3 –
3 Installation
1. Parts prepared at site
Please prepare the following parts before installation of the unit.
Preparation parts
Unit fixing screw
Power cable/
Protective earth cable
Main power switch
(Circuit breaker)
Transmission cable
DC power cable
Specification
M4 screw ×4pcs
Please prepare the power cable in compliance with your applicable technical standard with consid-
eration to the power requirement of the unit.
* Recommend type;φ1.5mm ~ φ2.0mm (Example: H03VV-F, H03VVH2-F, H05VV-F, H05VVH2-F)
Qty.:1pc
Type: 250VAC, Single-phase 50Hz, 3A
* Recommend type; CP30-BA series (MITSUBISHI ELECTRIC) or equivalent.
Type of the cable; Sheathed vinyl cords or cable which comply with the following specifications or
equivalent.
•CPEVS φ1.2mm~ φ1.6mm
•CVVS 1.25mm2~2mm2
* CPEV; PE insulated PVC jacketed shielded communication cable
* CVVS; PVC insulated PVC jacketed shielded control cable
Cable length: Please refer to section 5 Allowable length of M-NET transmission line
The DC power cable should comply with both local standards as well as the power requirement of
the unit.
Recommended type: 0.75mm2~2.0mm2
Cable length: Within 10m
2. Installation space and the direction
PAC-SC50KUA Power supply unit is not waterproof. Therefore this unit shall be installed in a control panel box or similar. Please
prepare the control panel box with consideration given to installation space as shown in the Fig.3-1.
The unit should be also installed in vertical direction also indicated by the arrow marking on the cover as shown in the Fig.3-1
Fig.3-1
20
20
20
20
UP
POWER RATING
MODEL
WEIGHT
SERIAL No.
2.11kg
POWER SUPPLY UNIT
MITSUBISHI ELECTRIC CORPORATION
PAC-SC50KUA

–4 –
4 Wiring
WARNING
•All electric work must be performed according to local regulations.
Improper electrical work may result in electric shock or fire.
•Be sure to shut off the power source of the unit and the all other unit to be connected to the power supply unit before wiring.
CAUTION
Do not connect the AC power line to the M-NET and POWER (DC12V) terminal blocks of this device. Otherwise, the unit may fail.
1. Cover Removal and Installation
When removing the cover, remove the 2 mounting screws and remove the cover.
When installing the cover, install the cover by tightening the 2 screws.
Fig.4-1
UP
POWER RATING
MODEL
WEIGHT
SERIAL No.
2.11kg
POWER SUPPLY UNIT
MITSUBISHI ELECTRIC CORPORATION
PAC-SC50KUA
M4
UP
POWER RATING
MODEL
WEIGHT
SERIAL No.
2.11kg
POWER SUPPLY UNIT
MITSUBISHI ELECTRIC CORPORATION
PAC-SC50KUA
3. Unit installation
Fix the unit to the control panel box using M4 screw as shown in the Fig.3-2.
CAUTION
The unit should be fixed with 4 positions to prevent from unit falling down.
Fig.3-2

–5 –
GND
12VDC
12V
24V
SBA
R
NL
NL
Power source
AC220~AC240V
~/N 50/60Hz
Circuit breaker Power cable
Ground
Protective earth
cable TB1
Fix the power line
Power cable
Protective
earth cable TB1
Fig.4-2
(L)
(N)
220V-240V~/N
Power line terminal
2. Power line
Wire the power cable and protective earth cable to L,N and the earth line terminals on the TB1 as shown in the Fig.4-2.
3. DC Power Supply and M-NET Transmission Line
The DC power line and M-NET transmission line connect as shown in Fig. 4-3. The DC power line has a 12VDC and a GND polarity.
Connect it to the terminals in accordance with the polarity. Connect the M-NET transmission line to the A, B (non-polarity) and S
(shield) terminal block.
Fig.4-3
GND
12VDC
12V
24V
SBA
NL
R
GND
12VDC
SBA
TB3
Fix the power line.
TB2
Within 10m
DC power supply line
(DC12V) ❈Polarized
M-NET transmission line
(Centralized control line)
Central controller
Outdoor
Unit
TB7
DC power supply line terminal
M-NET transmission
line terminal
TB3
M-NET transmission A,B line
(Non-polarity DC24V)
TB2
Shield

–6 –
5 Allowable length of M-NET transmission lines
•Maximum length of M-NET transmission 500m*1
•Maximum power feeding length 200m*1
NOTE
* 1: Not including the remote control cables up to 10m in length. If the remote control cable exceeds 10m, the excess must be
added to the total length in order to avoid exceeding the maximum length.
Example
1) Maximum length of M-NET transmission
1L2+L3+L4+r1+r2+r3 (r4) 500m
2L2+L3+L4+r1+r5500m
3L2+L3+L5+r6+r7 (r8) 500m
4r3 (r4) +r2+r1+L4+L5+r6+r7 (r8) 500m
5r5+r1+L4+L5+r6+r7 (r8) 500m
2) Maximum power feeding length for the indoor control line
1r1+r2+r3 (r4) 200m
2r1+r5200m
3) Maximum power feeding length for the centralized control line
1L1 +L2 200m
2L1 +L3+L4 (L5) 200m
NOTE
If the remote control cable (r4,r8) do not exceed 10m in length, the length for r4,r8 may not consider to the total length.
Central
controller
Power
supply
unit
DC Power
supply
(DC12V)
Length: max.10m
Outdoor
unit
Outdoor
Indoor Indoor Indoor
Indoor Indoor
Indoor Indoor Indoor
Remote controller
Remote controller
M-NET transmission line
(Centralized control line)
M-NET transmission line
(Indoor control line)
L2 L3 L4
L1
L5
r1r2
r3
r4
r5
r6
r8
r7
Indoor
CAUTION
•Both of PAC-SC50KUA and Outdoor unit can supply DC power to the M-NET transmission line.
Set the outdoor unit central control system transmission line power supply to the factory setting CN41 (no supply). For further
details, refer to the installation manual of the outdoor unit. Not doing so may cause unit failure or fire.
NOTE
The shied wire of M-NET transmission line shall be grounded by one point similar to earthing method.
The shield wire shall be connected to the S terminal of only one unit on the common transmission line.
After connection for the each cable, fasten each cable with the cable fixture.

WT03626X01 Printed in Japan
Recycled Paper
HEAD OFFICE: MITSUBISHI DENKI BLDG. , 2-2-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
This product is designed and intended for use in the residential,
commercial and light -industrial environment.
The product at hand is
based on the following
EU regulations:
• Low Voltage Directive 73/23/EEC
• Electromagnetic Compatibility Directive 89/
336/EEC