Dynamic Braking Connections; Heat Sink Mount Dynamic Braking Resistor; Installation; Preliminary Procedures - YASKAWA P7 User Manual

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Dynamic Braking Connections

"General
Dynamic braking (DB) enables the motor to be brought to a smooth and rapid stop. This is achieved by dissipating the
regenerative energy of the AC motor across the resistive components of the Dynamic Braking option. For further details on
dynamic braking operation, see the instruction sheet shipped with dynamic braking components.
Drives P7U20P4 thru P7U2018 and P7U40P4 thru P7U4018 have an integral braking transistor and require the addition of a
Remote Mounted Resistor Unit or a Heat Sink Mount Resistor (ERF). All higher rated Drives require the use of a Braking
Transistor Unit (CDBR) and a Remote Mount Resistor Unit.
Remote Mount Resistor Units typically mount outside of the electrical enclosure. Braking Transistor Units mount inside of the
electrical enclosure. Heat Sink Mount Resistors mount to the back of the Drive, attaching directly to the heat sink.
Drive
Rated Drive
Input Model No.
Vac P7U
20P4
20P7
208-240 21P5
22P2
23P7
40P4
40P7
480 41P5
42P2
43P7

"Installation

This option should only be installed by a technically qualified individual who is familiar with this type of equipment and the
hazards involved.
Hazardous voltages can cause severe injury or death. Lock all power sources feeding the Drive in the "OFF" position.
Failure to follow these installation steps may cause equipment damage or personal injury.

Preliminary Procedures

1. Disconnect all electrical power to the Drive.
2. Remove Drive front cover.
3. Use a voltmeter to verify that voltage is disconnected from incoming power terminals and that the DC bus has dissipated.
Table 2.7 Heat Sink Mount Dynamic Braking Resistor - 3% Duty Cycle
Qty.
Part No.
Reqd.
R7505 1
R7505 1
R7504 1
R7503 1
R7510 1
R7508 1
R7508 1
R7507 1
R7506 1
R7505 1
Electrical Installation 2 - 12
Heat Sink Mount Resistor
Resistance Power
(Ohms) (Watts)
200 150
200 150
100 150
70 150
62 150
750 150
750 150
400 150
115 150
200 150
WARNING
Approx. Dimensions (Inches)
Braking
Torque
Height
(%)
220 7.16
125 7.16
125 7.16
120 7.16
100 7.16
230 7.16
130 7.16
125 7.16
115 7.16
110 7.16
Width Depth
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51
1.73 0.51