Appendix 7. dynamic braking connections, A7-1 – Yaskawa GPD503 Drive User Manual
Page 150
Appendix 7. 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.
The GPD 503 in 230V 1-10HP (CT), 460V 1-20HP (CT), or 575V 5-25HP (CT) range has an
integral braking transistor; all higher rated drives require the use of external Braking
Units (also referred to as Braking Modules) which provide the braking transistor circuitry.
In addition, to make use of the Dynamic Braking function requires adding a heat sink
mount Braking Resistor (for 3% duty cycle; only available for the 230 1-5HP (CT) or 460V
1-3HP (CT) range) or external Braking Resistor Units (for 10% duty cycle).
Since the 3% Braking Resistor mounts directly to the drive’s heat sink, any braking
resistor overheating is sensed as a drive heatsink overtemperature fault. But for Braking
Resistor Units, interconnection to external control circuitry is necessary to ensure that
braking resistor overheating is communicated to the drive as a fault condition.
Available MagneTek dynamic braking components for 230V and 460V units are listed in
Table A7-1. To select dynamic braking components for 575V units, refer to Table A7-2.
A7-1
DRIVE
BRAKING MODULE
HS RESISTOR
(1)
BRAKING UNIT
DRIVE
BRAKING MODULE
HS RESISTOR
(1)
BRAKING UNIT
HP (CT)
PART NO. QTY Reqd
PART NO.
PART NO.
QTY Reqd HP (CT)
PART NO. QTY Reqd
PART NO.
PART NO.
QTY Reqd
1
N/A
—
50185430
50185130
1
1
N/A
—
50185530
50185330
1
2
50185431
50185131
1
2
50185531
50185331
1
3
50185432
50185132
1
3
50185532
50185332
1
5
50185433
50185133
1
5
N/A
50185333
1
7.5
N/A
50185134
1
7.5
50185334
1
10
50185135
1
10
50185335
1
15
50185034
1
51085136
1
15
50185336
1
20
50185034
1
50185137
1
20
50185337
1
25
50185035
1
50185138
1
25
50185234
1
50185338
1
30
50185035
1
50185139
1
30
50185234
1
50185339
1
40
50185034
2
50185137
2
40
50185234
1
50185340
1
50
50185034
2
50185137
2
50
50185235
1
50185341
1
60
50185035
2
50185139
2
60
50185235
1
50185342
1
75
50185035
2
50185139
2
75
50185234
2
50185340
2
100
50185035
3
50185139
3
100
50185235
2
50185342
2
150
50185234
3
50185340
3
200
50185235
4
50185342
4
250
50185235
5
50185342
5
300
50185235
5
50185342
5
400
50185235
6
50185342
6
For 230V GPD 503s
For 460V GPD 503s
Table A7-1. GPD 503 DB Components
(1)
When the heat sink mount Braking Resistor is used, DO NOT wire a Braking Unit to the drive.