— 2-2 —
Caution : Do not touch Driver Unit. Touching the Driver Unit just after the power is
turned off may cause electric shock.
◊
Driver Unit has high capacity conductors in its internal circuits and there
is high residual voltage for few minutes after the power is turned off.
◊
Do not detach a cover of Driver Unit unless it is necessary. When a
cover has to be removed, follow procedures described bellow.
1) Turn off the control and main power. If only main power has been turned
on, turn the control power on for more than 5 seconds, then turn off both
powers.
Neglecting this procedure is very dangerous. The procedure is to reduce
residual voltage of capacitors.
2) Wait for 5 minutes or more, then remove the cover.
Figure 2-1
5 seconds
or more
5 minutes or more
ON
OFF
ON
OFF
Control power
Main power
Remove cover
Caution : Use of the optional regenerative dump resistor shall be considered for heavy
duty operation .
◊
When the Motor is decelerating, rotational energy is dissipated by
internal dump resistor. Excessive rotational energy causes very high
regeneration of the Motor, the dump resistor is overheated, then the
alarms goes off and the Motor stops.
◊
Gentler deceleration rate or decreasing duty cycle prevents overheating
of the dump resistor.
◊
If heavy duty operation is still needed, installation of optional
“Regenerative Dump Resistor” is recommended. Refer to “Appendix 6”
for the details.
Danger : Never apply any water or oil to the Driver Unit. Take appropriate measures to
protect the Driver Unit from water, oil, slag, dust and corrosive gas.
Warning : Do not conduct an “Isolation test” or “Megger test” on the Driver Unit. It may
damage the internal circuit.
Caution : Be sure to adjust the servo parameters according to conditions of actual use.
In most cases, the Direct Drive Motor System cannot exhibit its full
performance unless the shipping set of these parameters are not altered.
Refer to “8. Tuning and Trial Running” for the details of parameter setting.
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