The PJS2880 rotary machine uses a thyristor-triggered speed-regulated DC motor as the main drive of the DC speed control system. Often due to the aging of electrical components and the change in resistance heating resistance, the unstable speed regulation cannot be started normally. The DC motor is also damaged due to heat and wear of the carbon brush and rectifier. The motor is bulky, with high energy consumption and low efficiency. In order to ensure safe production, reduce energy consumption and improve efficiency, we have transformed the main drive circuit of the PJS2880 rotary machine and adopted VVVF speed control system control, which has achieved satisfactory results. The main motor adopts the Y2200-4 type three-phase 380V 30KW AC motor produced by Anhui Wannan Motor Factory, the size of the base mounting hole is A = 318 B = 305 C = 120 aperture 19, the motor center height H = 200 shaft diameter d = 55 axis key W = 16 The diameter of the pulley is turned from the original diameter 48 to 55, the hole key W = 12 is processed by wire cutting to W = 16, the motor adjustment base is positioned by C = 120, and the line is drawn according to A = 318 B = 305. Bottom hole, tapping M16 thread. The cycloid pin gear reducer of the original low speed part is retained, and the base is reduced by 50 mm after the system is restructured, keeping the center height consistent with the motor center height, as shown in Figure 1. Remove the DC thyristor speed control system in the main motor drive control cabinet, keep XPl aviation plugs and terminal blocks, keep R, S, T, PE wires, drill M5 threaded holes on the mounting plate in the cabinet to install DZl00H air circuit Device. Adopt Huifeng Electronics Co., Ltd., model F1000-G0300T3C, 3PH 30KW inverter, installation hole distance A = 274, B = 420 XPl aviation socket terminal line number is as follows 720 WT38 705 WT37 771B D36 771 + D108 535 75 95 D107 Schematic diagram of the control terminals of Huifeng inverter 3.7 ～ 400KW OUTl OUT2 + 12V CM OPl OP2 0P3 0P4 0P5 0P6 0P7 OP8 V1 V2 V3 I2 FM IM TA TB TC In order to maintain the integrity of the circuit diagram, use the original line terminal number as much as possible to connect, take WT38, WT37, D36 line to connect the speed control voltage control terminals Vl, V2, V3, 771B line and Dl07 line to FM, V3 for the external speedometer V Line 7718 and 781- are connected. The original speed meter is a 50V voltmeter, which is now a 44C2 type O ～ 10V voltmeter. After the original modification on the dial surface, it can correctly display the printing speed value. Lines 702 and 705 are connected to the brake electromagnetic clutch, 701 is connected to the upper end of the normally closed contact of the KAl electric bell AC contactor, and the lower end is connected to the 705 line. Remove the three power supply cables of FR1 and W1, V1, and U1, and connect the 2 # line directly to the 0 # line. KA2 was originally a low-speed motor AC contactor, remove the three-phase power inlet and outlet of the main contact, connect the Dl08 line to the upper end of the main contact, and the lower end to the Dl07 line, which is the power supply ground for the inverter CM control. Dl08 line is connected to inverter 0P6 forward rotation command terminal, 95 line is connected to CM terminal. Line 535 is connected to the upper end of the main contact of the KM2 reverse point AC contactor, and the lower end is connected to the CM terminal, line 75 is connected to the upper end of the main contact of the KM1 positive point AC contactor, the lower end is connected to the CM terminal, and line 75 is connected to the inverter 0Pl jog terminal. After the above transformation, the energy consumption is reduced, and the reliability and production efficiency of equipment operation are improved.
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