X5 AC Drive User’s Manual Chapter 4: Connections
DPD00089A - 36 - © 2009 Vacon Incorporated All Rights Reserved
4.5 Dynamic Braking
The X5 AC drive is supplied with an integrated dynamic braking (DB) resistor, and is designed to
have adequate dynamic braking for most applications. In cases where short stopping times or high
inertia loads require additional braking capacity, install an external resistor.
Note: For Size 4 (60-100 HP) and Size 5 (125-200 HP) models, additional external dynamic braking
requires a kit that provides the connections to the braking transistors. The XDBKITS4 and
XDBKITS5 kits can be purchased through local distributors.
If an external resistor is used for dynamic braking, the internal resistor must be disconnected. To
install an external resistor, first disconnect the internal DB resistor (or resistors in 460 and 575 Vac
models) and properly terminate the wires leading to it. Then connect the external resistor fast-on
terminals where the internal resistor had been connected.
Changes to parameter 410 must be made when using external DB resistors.
Verify with the manufacturer of the selected resistor that the resistor is appropriate for your
application. Contact Vacon’s Electronic Application Engineering group for further assistance with
other possible sizing limitations.
Refer to Table 4-7 for information about dynamic braking capacity for each X5 model.
Table 4-7: X5 Dynamic Braking Capacity (Page 1 of 2) (* Note that the asterisked X5 model numbers cannot
have external braking added)
Model KW
Standard
Resistance
(ohms)
Standard DB
(% of Drive
Power)
Min. Allowed
Res. (ohms)
Max. Peak
Watts
Max. Ext. DB
(% of Drive
Power)
1S010* .75 125 164% -- -- --
20010* .75 125 164% -- -- --
20020* 1.5 125 82% -- -- --
20030* 2.2 125 55% -- -- --
20050 3.7 60 68% 43 3,555 95%
20075 5.5 60 45% 30 5,096 91%
20100 7.5 60 34% 27 5,662 76%
20150 11 60 23% 20 7,644 68%
20200 15 30 34% 10 15,288 102%
20250 18 30 27% 10 15,288 82%
20300 22 30 23% 10 15,288 68%
40010* .75 500 163% -- -- --
40020* 1.5 500 82% -- -- --
40030* 2.2 500 54% -- -- --
40050 3.7 120 136% 100 6,084 163%
40075 5.5 120 91% 75 8,112 145%
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