User`s manual

Installation and wiring
3
3-8
3. Installation and wiring
4) External braking resistor connection terminals ( (+), RB) )
• A regenerative braking circuit and braking resistor are built into the robot drivers
(RD*-20 and RDP-25). To enhance braking capacity, you can connect an optional
external braking resistor to these terminals. In this case, disconnect the shorting
bar from the internal braking resistor terminals (B1, B2). The wiring length should
be 5 meters or less. Wire by twisting the two wires together.
• Install a resistor whose resistance is higher than the R
BRmin
specified in the
following table.
Installing a resistor whose resistance is lower than specified will damage the
regenerative braking circuit.
Robot driver model Built-in braking resistor R
BR
Minimum resistance R
BRmin
RD*-05 None 100
Ω
RD*-10 None 100
Ω
RD*-20 30W 75
Ω
(10W, 0.5%) 50
Ω
RDP-25 50W 50
Ω
(15W, 0.5%)
40Ω
Note: The power (wattage) of built-in braking resistor R
BR
is the nominal value. The
values in parentheses indicate the available average power (W) and allowable
duty ratio (%).
For details on external braking resistors, refer to 10.1, "Options".
5) DC power input terminals ( (+), (–) )
• Connect a DC power supply to these terminals when supplying DC power from an
external converter. Use a DC power supply that provides 270 to 310V DC and has
sufficient capacity.
• When supplying DC power, do not connect anything to the main power input
terminals (L1, L2, L3).
• When supplying DC power, set the "DC bus power supply" (FA-07) parameter to
"Pn". If this is not set, an open-phase or momentary power failure will be
mistakenly detected.
6) Control power input terminals (L1C, L2C)
• In addition to the main circuit power supply, this robot driver requires a control
power supply. Be sure to connect a single-phase AC power supply to these control
power input terminals (L1C, L2C). Also use a circuit (wiring) protection breaker or
earth leakage breaker along with the control power supply. Some earth leakage
breakers may malfunction due to effects from higher harmonics, so use one having
large current sensitivity at high frequencies. When turning power on or off, allow
at least a 5-minute time interval between power on and off. Turning power on or
off at shorter time intervals may damage the robot driver.
7) Shorting terminals for internal braking resistor (B1, B2)
• When using the internal braking resistor, short the terminals B1 and B2 together.
When using an external braking resistor, disconnect the shorting bar from these
terminals. (The RD*-20 and RDP-25 have an internal braking resistor.)