TOSHIBA

Parameter Explanations (cont'd)

Item 9, VOLTAGE BOOST #1 - This parameter increases output voltage at low Hz to enable a motor operated in constant or variable torque modes to develop more starting torque. Too much voltage boost could result in an overcurrent trip.

Item 10, ACCELERATION TIME #1 (AT#1)

AT#1 sets the time for drive output frequency to go from 0 Hz to MAXIMUM OUTPUT FREQUENCY (Item 1). A small acceleration time may result in an overcurrent trip.

Item 11, DECELERATION TIME #1 (DT#1)

This parameter sets the time for drive output frequency to go from MAXIMUM OUTPUT FREQUENCY (Item 1) to 0 Hz. A small deceleration time may result in an overvoltage trip.

Item 12, ACC/DEC PATTERN #1

This value determines the way the drive's output frequency varies with time during an accel or decel as follows:

0:Linear pattern - Drive's output frequency change is linear with respect to time. For example, if the output goes from 0 to 30 Hz in 5 seconds, it will take 10 seconds to go from 0 to 60 Hz.

1:Self-adjusting - Drive changes value in AT#1 and DT#1 based on current during accel and bus voltage during decel to prevent overcurrent/overvoltage trips. Every time a run/stop is executed, the drive changes existing data in AT#1 and DT#1 (RAM). Drive may require a few run/stop commands to optimize value. To store modified AT#1 and DT#1 values, read value in AT#1 and DT#1 then press READ/WRITE to write values into memory (EEPROM).

2:S pattern - Drive output frequency's rate of change is slow near beginning and end of accel/ decel.

HZ

 

 

MAXIMUM OUTPUT FREQUENCY

 

 

 

OUTPUT

 

 

commanded frequency

 

 

 

*

AT#1

**

TIME

 

***

*S pattern accel time contributed by Item 13, ACCEL/DECEL PATTERN ADJUST LOW

**S pattern accel time contributed by Item 14, ACCEL/DECEL PATTERN ADJUST HIGH

***Total S pattern accel time

Drive follows similar curve during decel.

3:Overspeed pattern - When outputting a frequency greater than the motor's base frequency, drive extends accel/decel time to reduce possibility of overload trip due to reduction in torque.

HZ

MAXIMUM OUTPUT FREQUENCY

commanded frequency

OUTPUT

BASE FREQUENCY #1

 

AT#1

TIME

 

****

 

**** Actual accel time

 

Inspection

Specifications Precautions

Wiring

Jumpers

Panel

Keypad

Programming Parameters

Service

Dimensions

Index

9 - 4

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Image 73
Toshiba H3 manual Parameter Explanations contd, Commanded frequency, AT#1

H3 specifications

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