EM500 Open-Loop Vector Control Inverter User Manual 4. Keypad Operation 4.1 Keypad Function 4.1.1Structure of LED Keypad Control panels of EM500 can be classified into two categories: LED keypad and LCD keypad. LED keypad comprises a 5-bit LED display, 6 operation buttons, 1 digital potentiometer and 8 status and unit indicators. A user can operate inverter by keypad for parameter setting, status monitoring, start/stop operation, etc. Appearance and function zone of keypad are as shown in Figure 4–1. Figure 4-1 LED Keypad 4.1.2Functions of Buttons and Indicators of LED Keypad Functions of buttons and indicators of LED keypad are shown in Table 4–1. 59