Burkert Type 6650 - Manual (Page 5)

16
• in case of a PWM voltage drop:
Duty cycle 33 %, f=20kHz
PWM-signal
20 kHz
switch-off point
switch-on pulse
5 ms 0
100 %
U
t
For OEM electronics (PWM) recommended circuit diagram:
valve
supply voltage
Circuit diagram for 24 V design
english 17
• for resistance reduction:
Switch-on pulse 100 % nominal voltage for 5 ms, then
holding voltage 35 % nominal voltage
switch-off point
Switch-on pulse
5 ms 0
100 %
U
35 %
holding voltage
t
For OEM electronics (resistance reduction) recommended
circuit diagram:
Caution : Drop approx. 1.6 W
Alternatively series or parallel connection of several resistors
Connection
coil
Circuit diagram for 24 V design
english 17
18
7. INSTALLATION
7.1. Safety instructions
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the
pressure and vent the lines.
WARNING!
Risk of injury from improper installation!
• Installation may be carried out by authorised techni-
cians only and with the appropriate tools!
Risk of injury from unintentional activation of the
system and an uncontrolled restart!
• Secure system from unintentional activation.
• Following installation, ensure a controlled restart.
english 19
7.2. Fluid Installation
DANGER!
Danger – high pressure in the equipment!
• Before loosening the lines and valves, turn off the
pressure and vent the lines.
Installation position: any, actuator preferably upwards.
Procedure:
→
Before installation, clean any possible dirt off the pipe-
lines and flange connections.
→
Install a dirt trap to prevent malfunctions (Mesh size:
5 µm).
WARNING!
Danger through spillage of medium!
Leaking connections if seal seated incorrectly.
• Ensure that the supplied sealing gasket is seated
correctly!
The add-on dimension must not fall short of 4.5 mm!
english 19
Type 6650