一般电源电压220伏或380伏，必要时配置可调节电压的中间变压器。
The general power supply voltage 220 v or 380 v, the middle of the configuration of adjustable voltage transformer when necessary.
可调节电压变压器，电压输出为220v、20v、24v、28v，攻牙时根据攻牙力度需要可选择不同电压。
Adjustable voltage transformers, voltage output is 220v, 20v, 24v, 28v, tapping tapping efforts need to choose the time according to different voltage.
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