Countermeasures Against Lightning Surge Protection; Installation - Mitsubishi Electric MELDAS C6 Maintenance Manual

3.4.4 Countermeasures against Lightning Surge Protection

Generally, lightning surge infiltrates the control power supply from the power supply line. This control
power supply or the internal circuit can be damaged by lightning surge via the control power supply.
If this countermeasure is not taken throughout the control panel as shown in Fig. 1, the lightning surge
could flow over the signal line and damage the other devices.
Power
supply line
(1) Protective measures
Install the surge absorber on the power supply line for the separately prepared power supply units,
etc., as shown in Fig. 2 and Fig. 3.
The following two countermeasures are required as protection against general damage.
1) Installation of surge absorber
2) Installation of circuit protector
Power
supply line
Circuit protector
Fig. 2 Lightning surge countermeasures for single-phase power supply line
Power
supply
line
Circuit protector
Fig. 3 Lightning surge countermeasures for 3-phase power supply line

3. INSTALLATION

3.4 Noise Countermeasures
NC control
section
NC drive section
(Servo, spindle
amplifier)
Power supply
for panel
Fig. 1 Path of damage caused by lightning surge
Surge absorber (1)
Surge absorber (2)
I - 15
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Control panel
(Relay panel,
etc.)
Lightning surge path
Other device
(Power supply
for panel,
etc.)
Other device
(Power supply
for panel,
etc.)
Surge absorber (3)
Control panel
(Relay panel,
etc.)
Control panel
(Relay panel,
etc.)