User manual HITACHI BRD-EZ2-110K

[. . . ] 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] 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. To prevent this, use larger cables or twist them. Always use up to six non-induction resistors as external resistors. 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%. You can select an operating voltage level by setting the DIP switch. 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 shows settings of 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. In this case, both the main unit and the sub-unit must use external resistors of the same resistance. [. . . ] · Do not perform the dielectric strength test. When required, apply a voltage of 2000 VAC between the ground and the interconnected terminals for one minute and check for problems. · Do not use any other terminals for the dielectric strength test. · Be sure to increase and decrease the test voltage slowly. Voltage applied Time Meggar Time Insulation resistance test and dielectric strength test 0. 1 second or more 0. 1 second or more - 24 - Table 10. 1 Daily and Periodic Checks Check point Check cycle Check item Environment Checking Check ambient temperature, relative humidity, and concentration of dust, toxic gases, and oil mist. [. . . ]