User manual HITACHI BRD-E2-55K

[. . . ] NOTE: BRD-EZ2-110K is replaced by BRD-EZ3-110K HITACHI DYNAMIC BRAKING UNIT (BRD SERIES) 200V Class (BRD-E2-30K/55K) 400V Class (BRD-EZ2-30K/55K/110K) OPERATION MANUAL CONTENTS 1. UNPACKING INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IMPORTANT NOTICES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] l The power cables should be MLFC flame-retardant poly-flex wire, allowing a voltage of 600 V and capable of the specified amperage or fire may occur. Be sure to provide alarm contacts (AL1 and AL2) and a circuit, which shuts off primary power to the inverter to prevent overheating and burning if the dynamic braking unit malfunctions. -3- 2. Use cables at their specified ratings as short as possible: up to 5 meters between the dynamic braking unit and the inverter (P, N) and up to 50 meters between the dynamic braking unit and the discharging resistor (P, RB) (or up to 5 meters for the EZ2-30K). Do not loop extra cable. Up to 5 meters Up to Dynamic 50 meters braking unit (up to 5 meters)* Discharging resistor Example of correct wiring Inverter * In the EZ2-30K system, the cable between the dynamic braking unit and the discharging resistor must be 5 meters or shorter. Dynamic braking unit Discharging resistor Example of incorrect wiring Inverter The cables must be tied together and supported firmly so there is no excessive load on the dynamic braking unit. When the parallel connection interlocking function is used, signal cables (MA1, MA2, SL1, and SL2) between the dynamic braking units must be no more than five meters in length and no more than 0. 75 mm2 in width in its section area. The signal cable must be fully separated from the main circuit cable. Main circuit cable 10 cm or more Signal cable 4. When a combination of various resistors are used, the inductance in the resistors may raise the surge voltage during the switching operation. Use insulated crimping terminals to connect the cables to the terminal board TM1 (or TM2 of the EZ2). Use closed-loop terminals with insulated caps to connect cables to the terminal board TM2 (or TM3 of the EZ2). -4- 4. 2 Functional Setting You can select "Main unit, " "Sub-unit, " and an operating voltage level with the DIP switch. Note: Be sure to turn off the dynamic braking unit when setting the DIP switch. (1) Operating Voltage Set/Change function The dynamic braking unit supports three operating voltage levels: Standard (factory-set), 5%, and -10%. When an overvoltage trip occurs at a certain voltage or deceleration time, this function reduces the operating voltage of the dynamic braking unit to prevent an overvoltage trip. However, at a high input voltage, only the power will be turned on braking unit. Determine the operating voltage level according to the receiving voltage. Receiving voltage × · 2 + 20 V < Operating voltage ã (2) Parallel connection-interlocking function You can run two parallel-connected dynamic braking units interlocked by connection of their signal wires (MA1, MA2, SL1, and SL2) and setting of the DIP switches. You can use one of the dynamic braking units as a sub-unit and allow it to work at the operating voltage level of the main unit by setting the dynamic braking unit as a sub-unit by the DIP switch. Table 4. 1 DIP switch setting Function and operating voltage Main unit Operating voltage: Standard 363V (725V) Main unit Operating voltage: -5% 345V (689V) Main unit Operating voltage: -10% 326V (653V) Sub-unit DIP switch setting (X: Any position) OFF, OFF, ON, X Remarks 1 Factory-set 2 ON, OFF, ON, X 3 ON, ON, ON, X 4 X, X, OFF, X The operating voltage correspond to a main unit. The value in parentheses indicates the operating voltage of the 400V-class dynamic braking unit. -5- 4. 3 Example of External Connection Figure 4. 1 shows an example of a connection of a motor control system containing only one dynamic braking unit. Always use discharging resistors equal to or more than the resistance specified. If the resistance is insufficient, the dynamic braking unit may be damaged. To prevent overheating and burning during any malfunction of the dynamic braking unit, devise a circuit to shut off the primary power of the inverter by connecting this circuit to the alarm contact terminals (AL1 and AL2). Figure 4. 2 shows the connection of a thermal relay and Table 4. 2 shows a list of applicable wires. 400V class Connection to the alarm terminal section Power supply (Note 1) 3-phase power supply (Note 2) Motor Thermal relay (Usually closed (b contact) and opens when it is working) Inverter 200V class Dynamic braking unit (Main unit) External resistor Thermal relay 3-phase power supply Note 1: Select relay RY according to the coil (Mg) and contact (RY) specifications. Note 2: R0, T0 terminals depend on inverter model. Figure 4. 1 External connection example To the dynamic braking unit To the dynamic braking unit To terminals of the external resistor (when a 3-element thermal relay is used) To terminals of the external resistor (when a 2-element 3terminal thermal relay is used) Figure 4. 2 Connection of a Thermal Relay -6- 4. 4 Example of External Connection (Parallel Connection Operation) Figure 4. 3 shows a connection example of a motor control system, which uses the parallel connection interlocking function. [. . . ] (6) Thermal set value Thermal set value (A) · Rated capacity of the discharging resistor (W) 2 ÷ Resistance of the discharging resistor () ÷ 1. 2 * This is a reference value for enameled and ribbon resistors. - 23 - 10. MAINTENANCE AND CHECKS 10. 1 Notices on Maintenance and Checks Title: (Danger. eps) Creator: Adobe Illustrator(TM) 7. 0 CreationDate: (1/26/0) (5:10 PM) DANGER l Be sure to turn off the supply power. (Make sure that the DC voltage between terminals P and N is 45 volts or less. ) Otherwise, you may receive a serious electric shock. l Only an authorized electrician is allowed to check, maintain, and replace parts of the dynamic braking unit. (Take off all metallic accessories such as watches and jewelry before operating. ) (Use the insulated tools. ) Otherwise, you may receive a serious electric shock or personal injury. [. . . ]