Appendix 1: Ramp Profile Details - Toshiba TE Series Instruction Manual

Basic Installation and Operation Guide
Appendix 1 - Ramp Profile Details
Ramp 1 Settings
Initial
Ramp
Torque
Type
from...
Voltage F011
Current F012
Voltage F011
Current F012
Table APP 1.1: Ramp Selection Choices and Settings
Initial Torque
Ramp Time
Time
Figure APP 1.1:
Voltage Ramp w/o Current Limit
Initial Torque
Limit Setting
Ramp Time
Time
Figure APP 1.2:
Voltage Ramp with Current Limit
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The TE Series offers four different types of starting ramp profiles. Simply
select the one that best matches your motor / load requirements. In
addition, two separate ramps are available that can be selected via
contact closure (see section 4.2.5.a), and each one can be set up for any
ramp type as shown in the table below.
"Ramp Type
Ramp Current
Time Limit
from... from...
F013 F014
F013 F014
F013 F014
F013 F014
Following are descriptions of the four types of Ramp Profiles
1. Voltage Ramping is the most reliable starting method, due to the fact
Full Speed
that at some point the starter will reach an output voltage high enough to
allow the motor to draw full current and develop full torque. This method
is useful for applications where the load conditions change frequently
and significantly enough to require different levels of starting torque.
Examples where this is effective are:

Material handling conveyers

Positive displacement pumps

Drum mixers, grinders etc.
Voltage is increased from a starting point (Initial Torque) to full voltage
over an adjustable time period (Ramp Time). To achieve Voltage
Ramping, set the Ramp Profile (F010) to 0001 or 0003 (Voltage Ramp),
and the Maximum Current Limit setting (F014) to maximum (600%).
Since this is essentially Locked Rotor Current on most motors, there will
be little or no Current Limit effect on the Ramp profile. Initial Torque
setting comes from the Initial Voltage function F011.
2. Voltage Ramping with Current Limit works similar to mode 1, except
this mode adds an adjustable maximum current output. Voltage is
Full Speed
increased gradually until the motor current reaches the Maximum
Current Limit setting (F014) . The motor current is held at this level until
the motor accelerates to full speed. When the motor current drops below
the limit setting the output voltage is automatically increased to maximize
torque until the TE Series is At-Speed. This may be necessary in
Current
applications where the electrical power is limited. Examples would be:

Portable or emergency generator supplies

Utility power near the end of a transmission line or other starting
power demand restrictions.
Using Current Limit will override the Ramp Time setting if necessary, so
use this feature when acceleration time is not critical. The Ramp Time
setting however still determines the slope of the ramp up to the Current
Limit setting to apply the softest possible acceleration. To achieve
Voltage Ramping with Current Limit, set the Ramp Profile (F010) to 0001
or 0003 (Voltage Ramp), and the Maximum Current Limit setting (F014)
to a desired lower setting, as determined by your application
requirements.
TE Series Digital Solid State Soft Starters 18 – 1250A
Selection"
Ramp
from F010
Type
1 Voltage
2 Current
3 Current
4 Voltage
Ramp 2 Settings
Initial Ramp Current
Torque Time
from... from... from...
F015 F017
F016 F017
F016 F017
F015 F017
Limit
F018
F018
F018
F018