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Mitsubishi Electronics J2-JRSERIES MR-J2-03A5 User Manual

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3 -  41
3. SIGNALS AND WIRING
3.7.2
Explanation of signals
Abbreviation
Signal Name
Description
P24M
Main circuit power input
Power supply for main circuit
P24G
Power ground
Main circuit power supply and control power supply. Connected to SG and LG
inside the unit.
P24L
Control power input
Control power supply and digital I/O power supply. Always use a stabilizing
power supply.
Ground
Grounding terminal
Connect to the earth of the control box for grounding.
3.7.3
Power-on sequence
(1) Power-on procedure
1) Always wire the power supply as shown in above Section 3.7.1 using the relay with the main
circuit power supply. Configure up an external sequence to switch off the relay as soon as an
alarm occurs.
2) Switch on the control circuit power supply P24L, P24G simultaneously with the main circuit
power supply or before switching on the main circuit power supply. If the main circuit power
supply is not on, the display shows the corresponding warning. However, by switching on the
main circuit power supply, the warning disappears and the servo amplifier will operate properly.
3) The servo amplifier can accept the servo-on signal (SON) about 1 second after the main circuit
power supply is switched on. Therefore, when SON is switched on simultaneously with the 24V
power supply, the base circuit will switch on in about 1 second, and the ready signal (RD) will
switch on in further about 20ms, making the servo amplifier ready to operate.
(2) Timing chart
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Power supply 
Base circuit 
Reset
(RES)
Ready
(RD)
ON
OFF
Servo on
(SON)
SON accepted
(1s)
10ms
20ms
10ms
60ms
60ms
10ms
20ms
10ms
20ms
10ms