Toshiba 18 - 1250 A - Manual (Page 77)

TE Series Digital Solid State Soft Starters 18 – 1250A
70
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.
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.
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.
ƒ NOTE:
The PTC Input will act as an Overload trip (disable), however it
Stop Command
(Bypass Contactor Opens)
F025: Begin Decel Level
(Immediate step down)
F026: Decel Shut Off
(VMX Output Off)
Vol
ta
g
e
Time
F027: Decel Ramp Time
Full Spe e d
Check Valve
Closes
= Motor Torque
= Pump Output