Yaskawa GPD333 User Manual

DWG. NO. 02Y00025-0351 SHEET NO. 1 OF 7 EFF. 12/7/93 (m-df)

For GPD 333 230V 1/4-5HP, 460V 1/2-5HP Adjustable Frequency Drives

CHANGE RECORD 1

STD-5980 2-16-95

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).

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.

BUS CAPS

MOTOR

(A) "MOTORING" POWER FLOW

BUS CAPS

MOTOR

DB OPTION

BUS CAPS

MOTOR

(B) "GENERATING" POWER FLOW

DWG. NO. 02Y00025-0351 SHEET NO. 2 OF 7 EFF. 12/7/93 (m-df)

Refer to Sheet 1 for latest change.

Table 1

Drive Braking Resistor Unit

Voltage HP(CT) Part Number H W D H1 W1 Mtg Screws

1/4 —— — — — — — ——

2 3/4 5P41-0742 13.00 12.00 5.00 9.00 11.00 3/4 (4)

1 5P41-0742 13.00 12.00 5.00 9.00 11.00 3/4 (4)

1.5 5P41-0743 13.00 12.00 5.00 9.00 11.00 3/4 (4)

0 3 5P41-0744 13.00 12.00 5.00 9.00 11.00 3/4 (4)

5 5P41-0745 13.00 12.00 5.00 9.00 11.00 3/4 (4)

1/2 —— — — — — — ——

4 3/4 5P41-0752 13.00 12.00 5.00 9.00 11.00 3/4 (4)

1.5 5P41-0752 13.00 12.00 5.00 9.00 11.00 3/4 (4) 2 5P41-0753 13.00 12.00 5.00 9.00 11.00 3/4 (4)

0 3 5P41-0754 13.00 12.00 5.00 9.00 11.00 3/4 (4)

5 5P41-0755 13.00 12.00 5.00 9.00 11.00 3/4 (4)

Figure 1. Braking Resistor

(3% Duty Cycle)

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.

DWG. NO. 02Y00025-0351 SHEET NO. 3 OF 7 EFF. 12/7/93 (m-df)

Refer to Sheet 1 for latest change.

Figure 2. Braking Resistor Unit

(10% Duty Cycle)

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