Toshiba TOSVERT VF-PS1, Инструкция по эксплуатации

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E6581531
E-34
5
„ An example of setting when
WXE
=
Motor speed
Time
Input voltage
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
H
. In this case, the deceleration time refers to the
time elapsed before a motor running at HJ (maximum frequency) comes to a full stop.
• A motor coasts when the voltage in the inverter is becoming
H
or less.
The display alternately lights "
5VQR
" and continues the coasting state of the motor even though power
supply is recovered.
5.19 Dynamic (regenerative) braking - For abrupt motor stop
RD
: Dynamic braking selection
RDT : Dynamic braking resistance
RDER
: Allowable continuous braking resistance
H
: Braking resistance overload time
[Parameter setting]
Title Function Adjustment range Default setting
RD
Dynamic braking selection
:Disabled
:Enabled (braking resistance overload
detect)
:Select (braking resistance overload
not detect)
RDT
Dynamic braking resistance ~ Ω
According to model
⇒
Refer to page K-41.
RDER
Allowable continuous braking
resistance
~ kW
According to model
⇒
Refer to page K-41.
H Braking resistance overload time ~ sec.
* Default settings vary from model dependent.
⇒
Refer to page E-38, 39.
Protection levels defined by H (Refer to Section 6.15.2).
Note 1: The time set using H 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
RDER
is applied.) There is no need to change resistance settings recommended by Toshiba (except
DGP resistance setting).
Note 2: If the parameter
RD
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
H = )
Note 3: For inverters with ratings of 400V-250kW or more, set
RD
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.