45
CD1-a
Chapter 8 - Appendix
10 - SYSTEM OF POWER FEEDBACK VIA A BRAKING RESISTOR
All CD1 drives are equipped with the power feedback system. When the motor is decelerating with high inertia
and high speed, the mechanical braking energy is reflected to the drive. This energy is dissipated inside a resistor
called "braking resistor".
In order to avoid heat dissipation inside the drive, the braking resistor is ALWAYS mounted outside. It MUST be
mounted out of range of elements sensitive to heat and inflammable (plastic, cable sleeves, etc.).
For an optimum power feedback by the drives in a multiaxis application, the DC bus (DC+ and DC-) can be
connected in parallel (see diagram in chapter 4, section 1.5).
In this case, the mains input must also be parallel wired in order to balance the current load inside the AC/DC
converters.
It is recommended to mount the braking resistor on the drive with highest current rating.
On 400 V drives:
CD1-a-400/1.8 to 7.2 A, as from index "P",
CD1-a-400/14 A, as from index "H",
CD1-a-400/30 and 45 A, as from index "A",
an electronic control of the reflected power avoids the overloading of the braking resistor. So, if the energy
reflected to the drives with parallel mounted DC busses is too high, the DC bus voltage will rise up to the
triggering of the "Overvoltage" fault. A second resistor must then be mounted on the second axis.
THIS FUNCTION IS AVAILABLE ON 400 V DRIVES ACCORDING TO THE TABLE BELOW:
DRIVE TYPE DRIVE INDEX
CD1-a-400/1.8 to 7.2 A
≥ P
CD1-a-400/14 A
≥ H
CD1-a-400/30 A and 45 A
≥ A
11 - AMPLIFIER ORDER CODE
Series CD1
Analog +/- 10 V input
230 = 230 VAC operation voltage
400 = 400 or 480 VAC operation voltage
Current ratings:
2.25 / 4.5 / 7.5 / 10.5 / 16.5 Arms with 230 VAC
1.8 / 2.7 / 5.1 / 7.2 / 14 / 30 / 45 Arms with 400 VAC
CD1 - a - U / I
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