LENZE EVF9324-EV 3.0kW EVF9324-EV 3.0kW EVF9324-EV 3.0kW EVF9324-EV 3.0kW

Pulse duration
The pulse duration can be between 0 (no pulse, always off) and full scale (no pulse, period
duration always on).
The PWM output can, for example, be used to control the speed of a motor from standstill to
full speed or you can use it to control the position of a valve from closed to completely open.
You configure the pulse width modulation (PWM) mode in STEP 7 (TIA Portal).
The pulse width modulation mode has the following functions:
● When the option "High-speed output (0.1 A)" is activated, you can generate a minimum
pulse duration of 2 μs at a current of 100 mA. If the option "High-speed output (0.1 A)" is
not activated, you can generate a minimum pulse duration of 20 μs with a load > 0.1 A
and a minimum pulse duration of 40 μs with a load of ≥ 2 mA and a current of maximum
0.5 A. If a standard output is used, you can generate a minimum pulse duration of 100 µs
with a load of > 0.1 and a minimum pulse duration of 200 µs with a load of ≥ 2 mA.
● You can control the pulse output (DQA) of the channel manually via the control and
feedback interface.
● You can configure the reaction to CPU STOP. Upon change to CPU STOP, the pulse
output (DQA) is set to the configured state.For the pulse width modulation (PWM) mode, the user program directly accesses the control
and feedback interface of the channel.
Reconfiguration via the instructions WRREC/RDREC and parameter assignment data record
128 is supported. You can find additional information in section Parameter data records
(PWM) (Page 167).
You control the on-load factor (pulse-cycle ratio) of the pulse width via the OUTPUT_VALUE
field of the control interface. Pulse width modulation generates continuous pulses based on
this value. The period duration is adjustable.The control program must output the enable for the output sequence with the help of the
software enable (SW_ENABLE 0 → 1). The feedback bit STS_SW_ENABLE indicates that
the software enable is pending at the PWM.
If the software enable is activated (rising edge), STS_ENABLE is set. The output sequence
runs continuously, as long as SW_ENABLE is set.
Note
Output control signal TM_CTRL_DQ
• If TM_CTRL_DQ = 1, the technology function takes over the control and generates pulse
sequences at the output PWM DQA.
• If TM_CTRL_DQ = 0, the user program takes over the control and the user can set the
output PWM DQA directly via the control bit SET_DQADeactivating the software enable (SW_ENABLE = 1 → 0) cancels the current output
sequence. The last period duration is not completed. STS_ENABLE and the digital output
PWM DQA are immediately reset to 0.
A renewed pulse output is only possible after a restart of the output sequence.
Minimum pulse duration and minimum interpulse period
You assign the minimum pulse duration and the minimum interpulse period with the
parameter "Minimum pulse duration".
● A pulse duration determined by the technology function or PWM channel which is shorter
than the minimum pulse duration will be suppressed.
● A pulse duration determined by the technology function or PWM channel which is longer
than the cycle duration less the minimum interpulse period will be set to the value of the
cycle duration (output switched on permanentlyOUTPUT_VALUE assigns the on-load factor for the current period duration. You select the