TECHTOP TD20 Series Product Manual page 128

TD20 Series VFD
TD20 series VFDs have internal braking units.
Model
TD20-0R4G-S1
TD20-0R7G-S1
TD20-1R1G-S1
TD20-0R4G-S2
TD20-0R7G-S2
TD20-1R5G-S2
TD20-2R2G-S2
TD20-0R4G-2
TD20-0R7G-2
TD20-0R7G-4
TD20-1R5G-4
TD20-2R2G-4
Note:
Select the resistor and power of the braking unit according to the data our company provided.
The braking resistor may increase the braking torque of the VFD. The resistor power in the above table
is designed on 100% braking torque and 10% braking usage ratio. If the users need more braking torque,
the braking resistor can decrease properly and the power needs to be magnified.
•
Never use a brake resistor with a resistance below the minimum value
specified for the particular VFD. The VFD and the internal chopper are not
able to handle the overcurrent caused by the low resistance.
•
Increase the power of the braking resistor properly in the frequent braking
situation (the frequency usage ratio is more than 10%).
C.7.2 Placing the brake resistor
Use shielded cables for braking resistor cables.
Install all resistors in a place where they will cool.
•
The materials near the brake resistor must be non-flammable. The surface
temperature of the resistor is high. Air flowing from the resistor is of
hundreds of degrees Celsius. Protect the resistor against contact.
Only external braking resistor is needed in TD20.
Brake
resistor at
Type of 100% of
brake unit the
braking
torque (Ω)
361
192
96
361
192
96
Internal brake
unit
65
361
192
653
326
222
Appendix C Peripheral Options and Parts
The consumed power of the brake
resistor
10% braking 50% braking 80% braking
0.06
0.11
0.23
0.06
0.11
0.23
0.33
0.06
0.11
0.11
0.23
0.33
-126-
0.3 0.48
0.56 0.9
1.1 1.8
0.30 0.48
0.56 0.90
1.10 1.80
1.70 2.64
0.3 0.48
0.56 0.90
0.56 0.90
1.13 1.80
1.65 2.64
Min.
brake
resistor
(Ω)
42
42
30
42
42
30
21
131
93
240
170
130