Pwm Function - WITA go.tec 40 Serie Original Einbau- Und Betriebsanleitung

WITA go.tec 40-XX

8 PWm function

This function allows the control of the rotational speed of the pump by an external controller.
To use this function, the pump must be equipped with an appropriate input. This external input
can be recognized by an additional three-pole connection line, to which a corresponding external
controller can be connected.
The connection assignment is shown in the following figure:
Input
GND
Input: Red
GND: Black
Output: Yellow
The maximum cable length is 3m.
The signal line is galvanically separated from the pump electronics by an optocoupler.
The remote station to be connected:
• must reliably prevent direct contact to the operator with the cable cores when installed, i.e. the
terminals must be touch-safe and the terminal connections must be protected against unattend-
ed contact by a firmly mounted cover,
• must comply with the protection class I (connection with protective earth).
The unit must not be put into operation until the PWm signal
has been connected properly.
Warning: To prevent damage to the pump, the PWM signal cable must
never be connected to 230V!
The open collector PWm output must be connected to the evaluation electronics via a suitable
pull-up resistor. The operating voltage must be below 24V. In order to maintain a 1 to 2.5 mA
current, the resistance of pull-up resistor r should be in the following range in kΩ (assume u as
the pull-up voltage in unit Volt). Recommended pull-up resistors for different voltages:
3.3 V 1.21 kΩ – 3.19 kΩ
5V 1.89 kΩ – 4.89 kΩ
15V 5.89 kΩ – 14.89 kΩ
| 60-XX
Output
| 70-XX | 80-XX
Output
GND
Input
GB
41