Toshiba Tosvert VF-A5 - Manual (Page 83)

u r .
(Protection Parameters)
P b f p t j n
P b C P O P 5 5
Dynamic braking operation
Related parameters
P b Dynamic braking selection P b C P
P b r DBR resistor value
DP 5 S
DBR capacity
Overvoltage stall protection
Dynamic braking can be selected to prevent an oven/oltage trip during sudden deceleration or a decelerated
stop.
P b setting value Function
0 No DBR
/ Dynamic braking without overload detection
E Dynamic braking with overload detection
0 P 5 5 setting value Function
0 ON
/ OFF
* Overvoltage stall protection automatically controls the deceleration rate to prevent overvoltage tripping when
the voltage in the DC section of the inverter rises during deceleration. Note that this may cause the
deceleration time to be longer than the set time.
★ The resistor can become extremely hot (approx. 150°C) when dynamic braking is frequently operated, so take
this into consideration when selecting the installation site.
When
I P b I
is set to E , and the standard resistor is not used (refer to Appendix Table 3 on page 124), the
following settings are required for braking resistor overload protection.
P b r
1.0-1 ooon
P b C P
0.01 -eookw
* Select a dynamic braking resistor exceeding the min. allowable resistance value. (Refer to page 95.)
When using a nonstandard braking resistor with no temperature fuse, install a magnetic contactor (MC)
or a non-fuse breaker (MCCB) with shunt release on the inverter’s power supply input, so that the power
circuit can be opened by the inverter’s built-in fault detection relay (FL) or an overload detection device
in series with the braking resistor.
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