In clock-direction mode, the motor is operated via two inputs by a higher-level positioning controller with clock and direction signal. On each clock signal, the motor moves one step in the direction corresponding to the direction signal.
Activation can also take place via the hex coding switch. For the switch settings, see chapter Special drive modes (clock-direction and analog speed).
The following data apply for every subtype of the clock-direction mode:
The maximum frequency of the input pulse is 1 MHz; the ON pulse should not be less than 200 ns.
The "step size per pulse" value is set to 128 (2057h=128 and 2058h=1) ex works, which corresponds to a quarter step per pulse. A full step is the value "512", a half step per pulse corresponds to "256", etc.Note:
For a stepper motor with 50 pole pairs, 200 full steps correspond to one mechanical revolution of the motor shaft.
In clock-direction mode, the BLDC motors are also handled as stepper motors by the controller. This means that for a BLDC motor with, e.g., 3 pole pairs, 12 (=4*3) full steps correspond to one revolution.Note: If there is a change of direction, a time of at least 35 µs must elapse before the new clock signal is applied.
Subtypes of the clock-direction mode
Clock-direction mode (TR mode)
To activate the mode, object 205Bh must be set to the value "0" (factory settings).
In this mode, the pulses must be preset via the clock input; the signal of the direction input specifies the direction of rotation here (see following graphic).
Right / left rotation mode (CW / CCW mode)
To activate the mode, object 205Bh must be set to the value "1".
In this mode, the input that is used decides the direction of rotation (see following graphic).