Toshiba VF-PS1 User Manual

E6581386
E-34
5
Q An example of setting when =
Motor speed
Time
In
p
ut volta
g
e
Deceleration stop
• Even after the recovery from an input power failure, the motor continues slowing down to a stop. If the voltage in the
inverter main circuit falls below a certain level, however, control will be stopped and the motor will coast.
• The deceleration time varies according to the setting of . In this case, the deceleration time refers to the time
elapsed before a motor running at (maximum frequency) comes to a full stop.
5.19 Dynamic (regenerative) braking - For abrupt motor stop
 : Dynamic braking selection

: Dynamic braking resistance

: Allowable continuous braking resistance

: Braking resistance overload time
[Parameter setting]
Title Function Adjustment range Default setting
 Dynamic braking selection
:Disabled
:Enabled (braking resistance overload
detect)
:Select (braking resistance overload
not detect)

 Dynamic braking resistance ~ Ω
According to model
⇒ Refer to page K-41.

Allowable continuous braking
resistance
~ kW
According to model
⇒ Refer to page K-41.
 Braking resistance overload time ~ sec. 
* Default settings vary from model dependent. ⇒ Refer to page E-38, 39.
Protection levels defined by  (Refer to Section 6.15.2).
Note 1: The time set using  is the time for which the resistor sustains an overload. (Enter the time elapsed
before the inverter trips if a load 10 times as large as the allowable continuous braking resistance specified
using  is applied.) There is no need to change resistance settings recommended by Toshiba (except
DGP resistance setting).
Note 2: If the parameter  is set to  or  (regenerative braking selected), the inverter will be set automatically so
as to deal with the regenerative energy from the motor by means of a resistor, without taking any action to limit
overcurrent. (The same function as =)
Note 3: For inverters with ratings of 400V-250kW or more, set  to , because separate dynamic braking units are
not included as standard equipment.
•Function
Dynamic braking is used in the following cases:
1) Need to stop the motor quickly.
2) The inverter trips because of an overvoltage (OP) during deceleration.
3) Fluctuation of load condition causes a regenerative power even at a constant speed such as press machine.

Toshiba VF-PS1 Specifications

General

Brand	Toshiba
Model	VF-PS1
Category	Inverter
Language	English