3.6 Main Circuit Wiring
This section describes the functions, specifications, and procedures required to safely and
properly wire the main circuit of the drive.
NOTICE: Do not solder the ends of wire connections to the drive. Soldered wiring connections can loosen
over time. Improper wiring practices could result in drive malfunction due to loose terminal connections.
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Main Circuit Terminal Functions
Table 3.1 Main Circuit Terminal Functions
Terminal Type Function Reference
R/L1
Main circuit power
supply input
Connects line power to the drive.
Drives with single-phase 200 V input power use terminals R/
L1 and S/L2 only (T/L3 must not be used).
–S/L2
T/L3
U/T1
Drive output Connects to the motor. 49V/T2
W/T3
B1
Braking resistor
Available for connecting a braking resistor or the braking
resistor unit option.
–
B2
+1
DC link choke
connection
These terminals are shorted at shipment. Remove the shorting
bar
between
+1 and +2 when connecting a DC link choke to this
terminal.
–
+2
+1
DC power supply
input
For connecting a DC power supply. –
–
(2 terminals)
Ground Grounding Terminal 49
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Wire Gauges and Tightening Torque
Select the appropriate wires and crimp terminals from Table 3.2 through Table 3.4.
Note: 1. Wire
gauge recommendations based on drive continuous current ratings using 75 °C 600 Vac vinyl-
sheathed wire assuming ambient temperature within 30 °C and wiring distance less than 100 m.
2. Terminals +1, +2, –, B1 and B2 are for connecting optional devices such as a braking resistor. Do
not connect other non-specified devices to these terminals.
• Consider the amount of voltage drop when selecting wire gauges. Increase the wire gauge
when the voltage drop is greater than 2% of motor rated voltage. Ensure the wire gauge is
suitable for the terminal block. Use the following formula to calculate the amount of voltage
drop:
•
Line drop voltage (V) =
3 x wire resistance (Ω/km) x
wire length (m) x current (A) x 10
-3
• Refer to instruction manual TOBP C720600 00 for braking unit or braking resistor unit
wire gauges.
3.6 Main Circuit Wiring
46
YASKAWA ELECTRIC TOEP C710606 26B YASKAWA AC Drive – J1000 Quick Start Guide
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