Toshiba 18 - 1250 A User Manual

Page 50

TE Series

Digital Solid State Soft Starters 18 – 1250A

5.6.5 Pump-Flex

Decel Mode (F025 through F028)

Pump-Flex

deceleration is a feature of the TE Series Soft Starter that

slowly decreases the applied voltage to the motor when a stop
command is given, resulting in a gentle decrease in motor torque.
Deceleration provides a way to extend the stopping time so that abrupt
stopping does not occur. Deceleration is useful with centrifugal pumps,
material handlers, and conveyors where abrupt stopping could be
damaging to the equipment and/or load.

SEE APPENDIX 2 AT THE END OF THIS MANUAL for typical Pump-
Flex

Decel feature applications and more detailed descriptions of the

following functions.

F024 = Deceleration Ramp

Factory Setting = 0 (Disabled)
Range = 0 – 2

When F024 = 0, the deceleration feature is disabled.

When F024 = 1, the deceleration feature is enabled AND the overload

protection feature (from F003 - F005) remains active (power off
on OL trip).

When F024 = 2, the deceleration feature is enabled and deceleration

will continue even when an overload condition trips.

WARNING

Setting F025 = 2 presents significant risk of over-heating the motor beyond its design limits
which could result in motor damage and fire hazard. Do this only in circumstances where
the potential for mechanical damage outweighs the risk of motor damage.

F025 = Begin Decel Level (BDL)

Factory Setting = 60%
Range = 0 - 100% of line voltage
Use to drop voltage to a level where there is a noticeable effect
on motor torque during initial Decel mode.

F026 = Decel Shut Off Voltage

Factory Setting = 30%
Range = 0 to (BDL -1)%
Sets the level where the starter is turned off, corresponding to
where motor torque during Decel is no longer effective. Always
set this function lower than the setting of F026

F027 = Decel Ramp Time

Factory Setting = 10 seconds
Range = 1 - 60 seconds
Sets the maximum time for the deceleration ramp to go from the
Begin Decel Level setting (F026) to the Decel Shut Off Voltage
(F027).

NOTE:

When using the Decel function, count these cycles as additional
“starts” when determining maximum starts-per-hour of the motor.

Stop Command

(Bypass Contactor Opens)

F025: Begin Decel Level

(Immediate step down)

F026: Stop Level

(VMX Output Off)

Time

F027: Decel Ramp Time

(Determines slope)

Figure 5.6.5:

Pump-Flex De cel Ramp Settings

Full Speed