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3. SIGNALS AND WIRING
3.3 Explanation of power supply system
3.3.1 Signal explanations
POINT
For the layout of connector, refer to chapter 9 OUTLINE DRAWINGS.
Abbreviation
Connection target
(application)
Description
L
1
L
2
Main circuit power
supply
Supply the 1-phase power 200 to 230VAC 50/60Hz to L
1
and L
2
.
P
C
Built-in regenerative
resistor
or
regenerative option
1) LECSA2-S1
When using the regenerative option, connect it to P and C. (LECSA2-S1
does not provide a built-in regenerative resistor.)
2) LECSA2-S3/ LECSA2-S4
When using the driver built-in regenerative resistor, connect the built-in
regenerative resistor to P and C. (Factory-wired.)
When using a regenerative option,
first, disconnect the wirings to P and C,
second, remove the built-in regenerative resistor from the driver,
finally, connect the regenerative option to P and C.
+24V
0V
Control circuit power
supply
Supply 24VDC power to +24V and 0V.
U
V
W
Servo motor power
Connect to the servo motor power supply terminals (U, V, W). During power-
on, do not open or close the motor power line. Otherwise, a malfunction or
faulty may occur.
Protective earth (PE)
Connect to the earth terminal of the servo motor and to the protective earth
(PE) of the control box to perform grounding.
3.3.2 Power-on sequence
(1) Power-on procedure
1) Always wire the power supply as shown in above section 3.1 using the magnetic contactor with the main
circuit power supply (single-phase: L
1
, L
2
). Configure up an external sequence to switch off the magnetic
contactor as soon as an alarm occurs.
2) The driver can accept the servo-on (SON) about 1 to 2s after the main circuit power supply is switched
on. Therefore, when the servo-on (SON) is switched on simultaneously with the main circuit power
supply, the base circuit will switch on in about 1 to 2s, and the ready (RD) will switch on in further about
5ms, making the driver ready to operate. (Refer to paragraph (2) of this section.)
If the main circuit power supply is OFF while the servo-on (SON) is ON, the display on the driver shows
the corresponding warning. Switching ON the main circuit power supply discards the warning and the
driver operates normally.
3) When the reset (RES) is switched on, the base circuit is shut off and the servo motor shaft coasts.