LC1D18P7 SQUARE D, LC1D18P7 Datasheet - Page 147

• Manufacturer Part Number: LC1D18P7
• Description: IEC Contactor
• Manufacturer: SQUARE D

Specifications of LC1D18P7

• No. Of Poles: 3
• Contact Configuration: 3PST-NO
• Relay Mounting: DIN Rail
• Width: 45mm
• Relay Terminals: Screw Clamp
• Operating Voltage: 600VAC
• Switching Power Ac1: 3hp
• Switching Power Ac3: 15hp
• Switching Current Ac1: 32A
• Switching Current Ac3: 18A
• Load Current Inductive: 18A
• Load Current Resistive: 32A

01/04
2,5
1,5
0,5
Wye-delta Starting
Current
1 Starting in direct delta connection
2 Starting in wye connection
Torque
1 Starting in direct delta connection
2 Starting in star connection
3 Machine resistive torque
(1)
Example: maximum resistive torque on completion of star-delta start (expressed as a proportion of the rated torque).
0
7
6
5
4
3
2
1
0
2
1
0
0
Motor manufacturers generally specify machine load torques.
0,25
0,25
AC Wye-delta Starters LC3D (International Applications Only)
0,50
0,50
1
2
3
1
2
0,75
0,75
Speed
Speed
1
1
(1)
This method of starting is applicable to motors on which all six stator
terminals are accessible and whose delta connection voltage corresponds
to the mains voltage.
Wye-delta starting should be used for motors starting on no-load or having
a low load torque and gradual build-up: the starting torque in star
connection is reduced to one third of the direct starting torque, i.e. about
50% of the rated torque; the starting current in star connection is about 1.8
to 2.6 times the rated current.
The transition from wye to delta connection must occur when the machine
has run up to speed. A too rapid build-up in load torque would cause the
stabilized run-up speed to be too low and would therefore eliminate any
advantage in this method of starting: this is the case with certain machines
whose load torque depends on the machine speed (a characteristic of
centrifugal machines, for example).
All wye-delta starters are supplied with a special LA2DS2 or LA2KT2k time
delay relay which imposes a delay on the delta contactor during the
transition period in order to allow the star contactor sufficient breaking time.
For ratings D115 and D150, this function is performed by a time delay
auxiliary contact block LA2DT2 and a control relay.
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2001-2004 Schneider Electric All Rights Reserved
147