Carrier 50UA-UH 135 - Electrical Connections and Power Supply; Control Box and Power Supply Details; Voltage Imbalance and Wire Sizing

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WARNING: To prevent electrical shock or equipment
damage, make sure disconnects are open before electrical
connections are made. If this action is not taken, personal
injury may occur.
Field wiring must comply with all applicable codes. Take
special care when making the earth connection with the
main earth bar inside the control box.
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0LEASEREFERTOTHECERTIlEDDIMENSIONALDRAWINGSSUPPLIED
with the unit.
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4HEPOWERSUPPLYMUSTCONFORMTOTHESPECIlCATIONONTHE
unit nameplate. The supply voltage must be within the
range given in the electrical data table. For connections refer
TOTHEWIRINGDIAGRAMSANDTHECERTIlEDDIMENSIONALDRAWINGS
WARNING: Operation of the unit with an improper
supply voltage or excessive phase imbalance constitutes
abuse which will invalidate the Carrier warranty. If the
PHASEIMBALANCEEXCEEDSFORVOLTAGEORFOR
current, contact your local electricity supply at once and
ensure that the unit is not switched on until corrective
measures have been taken.
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Never operate a unit if the voltage imbalance exceeds 2%.
The following formula must be used to determine the
percentage of voltage imbalance. Voltage imbalance % =
Largest deviation from average voltage
Average voltage
Example:
Nominal supply: 400-3-50
AB = 404 V
BC = 399 V
AC = 394 V
404 + 399 + 394
3
Determine maximum deviation from average voltage:
AB = 404 - 400 = 4
BC = 400 - 399 = 1
AC = 400 - 394 = 6
Largest deviation is 6 volts. Percentage voltage imbalance
is therefore:
6
400
This is less than the permissible 2% and is therefore
acceptable.
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Wire sizing is the responsibility of the installer, and depends
on the characteristics and regulations applicable to each
installation site. The following is only to be used as a guide-
line, and does not make Carrier in any way liable. After wire
SIZINGHASBEENCOMPLETEDUSINGTHECERTIlEDDIMENSIONAL
drawing, the installer must ensure easy connection and
DElNEANYMODIlCATIONSNECESSARYONSITE4HECONNECTIONS
PROVIDEDASSTANDARDFORTHElELDSUPPLIEDPOWERENTRY
CABLESTOTHEGENERALDISCONNECTISOLATORSWITCHAREDESIGNED
for the number and type of wires, listed in the table below.
The calculations are based on the maximum machine current
(see electrical data tables) and the standard installation
practises, in accordance with IEC 60364, table 52C.
s 4HECALCULATIONISBASEDON06##U
s !MAXIMUMAMBIENTTEMPERATUREOF#HASBEEN
taken into consideration.
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main switch block can be connected without phase order
check. If the phase order is wrong,
Touch Pilot will not
operate the unit. Order of 3 phases should be changed
until the unit starts to operate.
WARNING: Phase order relay is used as standard
equipment in the electrical panel. Even if the unit doesn’t
operate due to phase order error, electricity is still on in
the panel
Motor
Average voltage = = 399 = 400 V
x 100 = 1.5%
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2 Setscrew
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4 Straight-edge must be parallel with belt
5 + 7 Motor and fan shafts must be parallel
6 Pulleys
31