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2. Installation and Wiring
2.8 Connection of stand-alone option units
1
2
3
4
5
6
7
8
9
10
2.8
Connection of stand-alone option units
The inverter accepts a variety of stand-alone option units as required.
Incorrect connection will cause inverter damage or accident. Connect and operate the option unit carefully in accordance with
the Instruction Manual of the corresponding option unit.
2.8.1
Connection of the brake resistor
• When an inverter-driven motor is driven by a load or requires rapid acceleration, install an external brake resistor. Connect
the brake resistor to terminals P/+ and PR. (For the locations of terminals P/+ and PR, refer to the terminal block layout
(
Use a brake resistor that has resistance and power consumption values higher than the following. Also, the brake resistor must
have a sufficient capacity to consume the regenerative power.
Set parameters as follows:
•
Pr.30 Regenerative function selection
= "1"
• Set
Pr.70 Special regenerative brake duty
according to the amount and frequency of the regenerative driving, and make
sure that the resistor can consume the regenerative power properly. (Refer to the FR-E800 Instruction Manual (Function).)
• When the regenerative brake transistor is damaged, install a thermal relay as shown in the following sequence to prevent
overheat and burnout of the brake resistor. Properly select a thermal relay according to the regenerative driving frequency
or the rated power or resistance of the brake resistor.
Voltage
class
Inverter
Minimum resistance
(
Ω
)
Power consumption
(kW)
575 V class
FR-E860-0017(0.75K)
350
2.4
FR-E860-0027(1.5K)
300
2.8
FR-E860-0040(2.2K)
260
3.3
FR-E860-0061(3.7K)
190
4.5
FR-E860-0090(5.5K)
140
6.1
FR-E860-0120(7.5K)
100
8.5
CAUTION
• If the resistor selection is incorrect, overcurrent may damage the inverter built-in brake transistor. Besides, the resistor
may be burned due to overheat.
• If the selection of the thermal relay is incorrect, the resistor may be burned due to overheat.
MC
R
PR
P/+
S/L2
T/L3
R/L1
ON OFF
F
T
MC
(OCR)
Inverter
OCR
Contact
<Example 1>
Power
Supply
MC
Thermal relay
Brake resistor
MC
T
R
PR
P/+
S/L2
T/L3
R/L1
ON OFF
B
C
F
MC
MC
Brake resistor
Thermal relay
(OCR)
Inverter
OCR
Contact
<Example 2>
Power
Supply