Toshiba DN-68249-003, Installation & Operation Manual

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Installation and Connections
Q9 Plus ASD Install/Op Manual
Grounding Capacitor
The Grounding Capacitor plays a role in minimizing
the effects of leakage current through the ASD
system and through ground paths to other systems.
Leakage current may cause the improper operation
of earth-leakage current breakers, leakage-current
relays, ground relays, fire alarms, and other sensors
— and it may cause superimposed noise on CRT
screens.
The Grounding Capacitor Switch allows the user to
quickly change the value of the leakage-reduction
capacitance of the 3-phase input circuit. See figures
4 , 5 , 6 , and 7 for an electrical depiction of the
leakage-reduction functionality and the methods
used to change the capacitance value. The method
used is typeform-specific.
If using a 460-volt ASD that is in the range of 5.0
HP to 25 HP, and the U/T1, V/T2, and W/T3
connections to the motor are 100 meters or more in
length, the ASD Carrier Frequency must be set to 4
kHz or less when activating or deactivating the
Grounding Capacitor Switch . ASD overheating may
occur if the Carrier Frequency is set above 4 kHz
when activating or deactivating the
Grounding
Capacitor Switch .
See pg. 3 for more information on the Grounding
Capacitor Switch and pg. 10 for the location.
Figure 4. The Grounding Capacitor Switch is
used on typeforms — 200-volt 0.5 HP to 10 HP
and the 25 and 30 HP/460-volt 1.0 HP to 250 HP.
The value may be set to Maximum (default
setting) or to Zero by pushing or pulling the switch
actuator, respectively.
Figure 5. The Grounding Capacitor Switch is used
on typeforms — 200-volt 15 HP to 20 HP and the
40 HP to 60 HP/ 460-volt 30 HP to 100 HP.
The value may be set to Large (default setting) or
Small by pushing or pulling the switch actuator,
respectively.
Figure 6. The Grounding Capacitor Bar is used
on typeforms — 200-volt 75 HP and the 100 HP/
460-volt 125 HP and the 150 HP.
The value may be set to Large or Small (default
setting) by connecting or disconnecting the
switching bar, respectively.