Toshiba GX9, Installation & Operation Manual

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186 GX9 ASD Installation and Operation Manual
Overload Reduction Start Frequency
Program

Protection

Overload
This parameter is primarily used with V/f motors. It is used to reduce the
starting frequency at which the
Overload Reduction function begins and is
useful during extremely low-speed motor operation.
During very low-speed operation the cooling efficiency of the motor decreases.
Lowering the start frequency of the
Overload Reduction function aides in
minimizing the generated heat and precluding an Overload trip.
This function is useful in loads such as fans, pumps, and blowers that have the
square reduction torque characteristic.
Set parameter F607 to the desired Overload Time Limit .
Direct Access Number — F606
Parameter Type — Numerical
Factory Default — 6.00
Changeable During Run — Yes
Minimum — 0.00
Maximum — 30.00
Units — Hz
Motor 150% Overload Time Limit
Program

Protection

Overload
This parameter establishes a time that the motor may operate at 150% of its
rated current before tripping. This setting applies the time/150% reference to
the individual settings of each motor (e.g., this setting references 150% of the
F600 setting for the 1 motor).
The unit will trip sooner than the time entered here if the overload is greater
than 150%.
Direct Access Number — F607
Parameter Type — Numerical
Factory Default — 600
Changeable During Run — Yes
Minimum — 10
Maximum — 2400
Units — Seconds
Suppression of Inrush Current Timing
Program

Protection

Special Protection Parameters
The startup inrush current may be suppressed. This parameter Enables/
Disables the inrush current suppression function.
Settings:
0 — (Disabled)
1 — (Enabled)
Direct Access Number — F609
Parameter Type — Selection List
Factory Default — 0 (Disabled )
Changeable During Run — No
Minimum — 0
Maximum — 1
Low-Current Trip Selection
Program

Protection

Low-Current Settings
This parameter Enables/Disables the low-current trip feature.
When enabled, the ASD will trip on a low-current fault if the output current of
the ASD falls below the level defined at
F611 and remains there for the time set
at F612 .
Settings:
0 — Disabled
1 — Enabled
Direct Access Number — F610
Parameter Type — Selection List
Factory Default — Disabled
Changeable During Run — No
Low-Current Detection Current
Program

Protection

Low-Current Settings
With the Low-Current Trip ( F610 ) parameter is enabled, this function sets the
low-current trip threshold.
The threshold value is entered as a percentage of the maximum rating of the
ASD.
Direct Access Number — F611
Parameter Type — Numerical
Factory Default — 0
Changeable During Run — Yes
Minimum — 0.00
Maximum — 100.00
Units — %
F606 F611