Toshiba 18 - 1250 A Instruction Manual page 77

TE Series
Setup and Use
Pump systems vary greatly. To accommodate this, the Pump-Flex
Decel control feature is designed to provide complete flexibility in how
the deceleration process takes place by using the following settings.
Decel begins when a Stop command is given (or the Run command is
removed). If there is a Bypass Contactor, it will open immediately,
putting the power control back to the SCRs.
Stop Command
(Bypass Contactor Opens)
Full Spe ed
F027: Decel Ramp Time
Time
Figure APP2.2: Pump-Flex Decel Graph
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. When a
Stop command is given, the starter begins to apply Decel
voltage. However, if an overload trip occurs, the starter ceases
applying Decel voltage and the motor coasts to a stop to
prevent additional motor heating and potential motor damage.
When F024 = 2, the deceleration feature is enabled and deceleration
will continue even when an overload condition trips. This is
to be used only when the risk of damage due to an uncontrolled
shutdown is considered worse than the potential damage to the
motor.
outweighs the risk of motor damage.
NOTE:
The PTC Input will act as an Overload trip (disable), however it
Digital Solid State Soft Starters 18 – 1250A
F025: Begin Decel Level
(Immediate step down)
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
70
Check Valve
Closes
F026: Decel Shut Off
(VMX Output Off)
= Motor Torque
= Pump Output
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