For GPD 333 230V 1/4-5HP,
460V 1/2-5HP
Adjustable Frequency Drives
DYNAMIC BRAKING (DB) OPTION
(BRAKING RESISTOR (3%) OR
BRAKING RESISTOR UNIT(10%))
(PART NUMBERS DETERMINED BY DRIVE RATING)
Before installing this option, a TECHNICALLY
QUALIFIED INDIVIDUAL who is familiar with this type of equipment and the hazards involved, should
READ this ENTIRE INSTRUCTION SHEET.
IMPORTANT
This option may have been installed by the factory. However, certain steps can only be completed at the installation site. Therefore, review and perform those steps which complete the installation process.
DESCRIPTION
Installation of this option 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.
Dynamic Braking Operation
Whenever an excited motor is operated in the negative slip region (or is subjected to an overhauling load), the motor will behave as an induction generator. In this mode, energy will actually flow from the motor back into the drive, as shown in illustrations
(A) and (B).
(A) "MOTORING" POWER FLOW
MOTOR
BUS
CAPS
(B) "GENERATING" POWER FLOW
BUS
CAPS
MOTOR
This energy will cause the DC Bus voltage to rise.
Another condition that will cause the DC Bus voltage to rise is when the input voltage to the drive is high.
When the DC Bus voltage reaches a certain level, the
Dynamic Braking option will activate. The option will actually “shunt” the regenerative energy away from the Bus capacitors, as shown in illustration (C), and will dissipate it as heat in the DB resistors. Since the regenerative energy is dissipated in the DC resistors, the Overvoltage (OV) trip is prevented; thus the motor remains excited and continues to produce braking torque. However, for the high input voltage condition, an input contactor (1M) should be used (see Figure 4 or Figure 5) to disconnect the drive when the high input voltage exists for a long period of time.
(C) POWER SHUNTED FROM BUS CAPS
BUS
CAPS
MOTOR
DB OPTION
CHANGE RECORD
1 STD-5980 2-16-95
DWG. NO. 02Y00025-0351
SHEET NO. 1 OF 7
EFF. 12/7/93 (m-df )
Drive
Voltage HP(CT) Part Number
2
3
1/4
3/4
1
1.5
——
5P41-0742
5P41-0742
5P41-0743
0
4
6
0
1.5
2
3
5
3
5
1/2
3/4
5P41-0744
5P41-0745
——
5P41-0752
5P41-0752
5P41-0753
5P41-0754
5P41-0755
13.00
13.00
—
13.00
13.00
13.00
13.00
13.00
Table 1
H
Braking Resistor Unit
W D
—
13.00
13.00
13.00
—
12.00
12.00
12.00
—
5.00
5.00
5.00
12.00
12.00
—
12.00
12.00
12.00
12.00
12.00
5.00
5.00
—
5.00
5.00
5.00
5.00
5.00
—
9.00
9.00
9.00
9.00
9.00
H1
—
9.00
9.00
9.00
9.00
9.00
—
11.00
11.00
11.00
11.00
11.00
W1
—
11.00
11.00
11.00
11.00
11.00
Mtg Screws
——
3/4 (4)
3/4 (4)
3/4 (4)
3/4 (4)
3/4 (4)
——
3/4 (4)
3/4 (4)
3/4 (4)
3/4 (4)
3/4 (4)
RECEIVING
All equipment is tested against defect at the factory.
Report any damages or shortages evident when equipment is received immediately to the commercial carrier who transported the equipment. Assistance, if required, is available from your MagneTek sales representative.
STORAGE
If the option is not to be installed immediately, it must be stored under the following conditions:
– Ambient temperature: -10 to +40° C.
– Protected from rain and moisture.
– Free from corrosive gases or liquids.
– Free from dust or metal particles.
– Clean and dry.
– Free from excessive vibration.
Figure 1. Braking Resistor
(3% Duty Cycle)
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 2 OF 7
EFF. 12/7/93 (m-df )
Figure 2. Braking Resistor Unit
(10% Duty Cycle)
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 3 OF 7
EFF. 12/7/93 (m-df )
INSTALLATION
Preliminary Procedure
WARNING
HAZARDOUS VOLTAGE CAN CAUSE
SEVERE INJURY OR DEATH.
LOCK ALL POWER SOURCES
FEEDING DRIVE IN “OFF” POSITION.
1.
Disconnect all electrical power to drive.
2.
Remove drive front cover.
3.
Verify that voltage has been disconnected by using a voltmeter to check for voltage at the incoming power terminals.
NOTE
Since the drive has integral braking transistors, the Dynamic Braking option only requires addition of the braking resistor (3% duty cycle)
OR the remote-mounting braking resistor unit
(10% duty cycle).
A. Braking Resistor (3% Duty Cycle) Installation
4.
The 3% duty cycle braking resistor is supplied with 6 inch leads, as shown in Figure 1.
5.
The braking resistor requires vertical installation with ample space to achieve high efficiency cooling.
6.
Connect leads from the braking resistor to drive terminals according to Figure 3 and Figure 4.
NOTE
GPD 333
B1/+ B2
P B
BRAKING
RESISTOR
Figure 3. Lead Connections For Braking
Resistor (3% Duty Cycle)
External control components shown in Figure
5 are not supplied with the option. These components are necessary for safe operation of the Dynamic Braking option.
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 4 OF 7
EFF. 12/7/93 (m-df )
B. Braking Resistor Unit Installation
7.
The braking resistor unit requires vertical installation with ample clearance space (see Figure 2) to achieve high cooling efficiency.
IMPORTANT
Since the braking resistor unit generates heat during dynamic braking operation, install it in a location away from other equipment which emits heat.
8.
Open the braking resistor terminal box for access to terminals. Connect the braking resistor unit to the drive according to Table 2 and Figure 5.
ADJUSTMENTS
9.
The braking resistor (3% duty cycle) and the braking resistor unit (10% duty cycle) require drive re-programming. Program constant no-20 to
1 X X X, which disables stall prevention during decel.
10.
Reinstall and secure front cover on the drive and close and secure the terminal box on the the remote-mount braking resistor unit.
11.
Place this instruction sheet with the GPD 333
Technical Manual.
This completes the installation of this option.
Terminals
Lead Size (AWG)
Lead Type
Table 2
B, P
12-10
1, 2 ✱
18-14 ✱
600V ethylene propylene rubber insulated or equiv.
Terminal Screw M4
✱ Power leads are for the braking resistor unit generate high levels of electrical noise; these signal leads must be grouped separately.
NOTE
External control components shown in Figure
5 are not supplied with the option. These components are necessary for safe operation of the Dynamic Braking option.
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 5 OF 7
EFF. 12/7/93 (m-df )
L1
L2
L3
CB
1M
1M
1M
R
S
T
GPD 333
4
CONTROL
PCB
B1/+ B2
6
U
V
W
T2
T1
T3
PART OF
EXTERNAL
CIRCUIT
120VAC
THRX
*
THERMOSTAT
OR OVERLOAD
THRX
POWER
OFF
POWER
ON
1M
THRX
RC
1M
RC
FAULT
CONTACT
THRX
*
*
CUSTOMER SUPPLIED COMPONENTS
BRAKING
RESISTOR
(3% DUTY
CYCLE)
Figure 4. Wiring Braking Resistor (3% Duty Cycle) to Drive
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 6 OF 7
EFF. 12/7/93 (m-df )
L1
L2
L3
CB
1M
1M
1M
R
S
T
GPD 333
4
CONTROL
PCB
B1 B2
6
U
V
W
P
2
1
B
THG
PART OF
EXTERNAL
CIRCUIT
THRX
120VAC
THRX
POWER
OFF
POWER
ON
1M
THRX
RC
1M
RC
FAULT
CONTACT
THRX
*
*
CUSTOMER SUPPLIED COMPONENTS
T2
T1
T3
BRAKING
RESISTOR
UNIT
(10% DUTY
CYCLE)
Figure 5. Wiring Braking Resistor Unit (10% Duty Cycle) to Drive
Refer to Sheet 1 for latest change.
DWG. NO. 02Y00025-0351
SHEET NO. 7 OF 7
EFF. 12/7/93 (m-df )
