TB Wood's X4, User Manual, Page: 31 / 98

X4 AC Drive User’s Manual Chapter 4: Connections
1428D-0607 - 23 -
© 2007 TB Wood’s All Rights Reserved
4.5 Dynamic Braking
The X4 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: External braking cannot be added to Size 0 models. 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 (not applicable for Size 0 models), the internal
resistor must be disconnected. Internal DB resistors are connected with fast-on terminals. 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 (DB Config) 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 TB Wood’s Electronic Application Engineering for further assistance with
other possible sizing limitations.
Refer to Table 4-6 on page 24 for information about dynamic braking capacity for each X4 model.
X4C50250C — — — — — 50
X4C50300C — — — — — 50
X4C50400C — — — — — 70
X4C50500C — — — — — 80
X4C50600C — — — — — 90
X4C50750C — — — — — 110
X4C51000C — — — — — 150
X4C51250C — — — — — 175
X4C51500C — — — — — 200
X4C52000C — — — — — 250
Table 4-5: Fuse Ratings (Page 2 of 2)
Model Number
Fuse Size
115 Vac
JJS/JJN
Fuse Size
208 Vac
JJS/JJN
Fuse Size
230 Vac
JJS/JJN
Fuse Size
380 Vac
JJS
Fuse Size
460 Vac
JJS
Fuse Size
575 Vac
JJS