E6581301
E-36
5
!
!
Motor speed"
Time
"
Synchronized
acceleration/dece
leration signal "
(S1 terminal) "
H
Inverter 1
"
H
Inverter
2
"
ON
H
H
Input voltage
*1
*1:Even with WXE=,, functions are used, a motor may coast according to loa d conditions.
In this case, try to adjust the parameter "H" and "H".
5.19 Dynamic (regenerative) braking - For abrupt motor stop
 RD
RDRD
RD
: Dynamic braking selection
RDT
RDTRDT
RDT
: Dynamic braking resistance
RDER
RDERRDER
RDER
: Dynamic braking resistor continuous capacity
H
HH
H
: Braking resistance overload time
[Parameter setting]
Title Function Adjustment range Default setting
RD Dynamic braking selection :Disabled
~:Enabled
RDT Dynamic braking resistance ~ According to model
Refer to page K-48.
RDER Dynamic braking resist#r
continuous capacity ~ kW According to model
Refer to page K-48.
H Braking resistance overload
time ~ sec. 
* Protection levels defined by H (Refer to Section 6.14.2).
Note 1: The dynamic braking selection works on the following conditions.
Setting Braking function
Inverter trip condition
(The state of QNT trip
is excluded)
ST-off condition Dyn amic braking resistor
overload detect
 Disabled - - -

Enabled
Enabled Enabled Protect
 Enabled Enabled No Protection
 Enabled Disabled Protect
 Enabled Disabled No Protection
 Disabled Enabled Protect
 Disabled Enabled No Protection
 Disabled Disabled Protect
 Disabled Disabled No Protection
Note 2: The time set using H is the time for which the resistor sustains an o verload. (Enter the time elapsed
before the inverter trips if a load 10 times as large as the dynamic braki ng resistor continuous capacity
specified using RDER is applied.) There is no need to change resistance setti ngs recommended by Toshiba
(except DGP resistance setting).
Note 3: If the parameter RD is set to ~ (regenerati ve braking selected), the inverter will be set auto matically so
as to deal with the regenerative energy from the motor by means of a resi stor, without taking any action to
limit overcurrent. (The same function as H=)
Note 4: For inverters with ratings of 400V-200kW or more, set RD to ~ , because separate dynamic braking uni ts
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 spe ed such as press machine.