User Manual

13
Start-up
8.5 Selecting the operating mode /
pin assignment
There are 4 operating modes:
• Forward dosing
• Reverse dosing
• Rinsing mode, i.e. there is a free flow through the dosing unit
• Heating mode to be used at low temperatures
The various operating modes are generated by different configurations
of the four plug pins:
PIN Forward
dosing
Reverse
dosing
Rinsing mode
(all of the valves
are open)
Heating
mode
1
(supply)
1)
+ +
not connected
+
2
( reverse )
not connected
+ + +
3
(GND)
– – – –
4
(forward)
+
not connected
+ +
1) The unit will operate without a continuous power supply on pin 1.
In this case, there is a brief initialization time before the dosing (approx. 25
ms).
The duty cycle time in the rinsing mode is limited to avoid over-
heating. The unit is switched off automatically after 10 minutes.
Pin 1
Pin 2
Pin 3
Pin 4
4-pole Molex connector
(Molex no. 50-57-9404)
Fig. 7: Configuration of all four of the plug pins
If the ambient temperature is low, heating mode can be used to warm-up
the unit. For safety reasons, heating mode only ever operates for 60 s,
the unit then automatically switches back to a mode with a lower power
consumption.
If the heat output during the unit's heating cycle is not sufficient, the
heating cycle can be repeated by briefly interrupting (> 5 ms) and then
reconnecting the power supply voltage.
NOTE!
Overheating and destruction of the components!
The unit components must not exceed a temperature of 80°C.
The unit's fluid channels are blocked during the heating operation.
Also refer to the control diagram in chapter "Start-up /
Functions".
english
Type 7615