User manual for the KD7321 dual‑channel, four‑program digital spot‑welding synchronization controller.
The KD7321 is a digital micro‑computer spot‑welding synchronization controller that uses a microcontroller as its core. It provides two main SCR trigger outputs and one electromagnetic valve control signal, allowing control of two welding transformers with a sequence of pre‑press, weld, forge and pause stages.
The manual describes installation, wiring of the 7‑pin aviation connector, foot‑switch operation, parameter adjustment via the panel buttons, and safety precautions such as providing external protective devices and ensuring the controller shares the same power source as the welding machine. This manual is written in Chinese.
| 程序段数量 | 2×4 |
|---|---|
| 各程序段周波数范围 | 0‑99 (0‑~198 s) |
| 周波数精度 | +0 |
| 工作电流相对值调节范围 | 0‑99.5 (相对值) |
| 控制输出量 | 2 路主晶闸管触发信号、1 路电磁阀控制信号 |
| 脚踏开关输入 | 2 路 |
| 电源电压 | AC 380 V 50 Hz |
| 体积和重量 | 9 × 24 × 18 cm, 2.2 kg |
It supports two channels, each with four program segments (2 × 4).
Foot switch 1 runs the sequence pre‑press 1 → weld 1 → forge 1 → pause 1; foot switch 2 runs pre‑press 2 → weld 2 → forge 2 → pause 2; pressing both switches together runs a combined sequence.
It requires an AC 380 V, 50 Hz power supply.