VACUUBRAND MZ 2 VARIO-SP - Manual (Page 26)

page 26 of 51
Controlling the pump
Connecting the cable:
Use and operation
As set at the factory, the pump is designed for operation
with a control signal; i.e., without a control signal, the pump
does not start!
To operate the pump without a control signal, change the
settings on the circuit board (see below)!
External setting of the motor speed via PWM (factory set):
PWM (5V - max. 24V), frame frequency: 100Hz to 1.5kHz
0% to 100% PWM: Linear increase of the motor speed (0 to 2400 rpm):
Minimum motor speed 400rpm: at 17% PWM
Maximum motor speed 2400rpm: at 100% PWM
e.g., at a frame frequency of 100 Hz and 25% PWM: pulse-width 2.5 ms
NOTICE
The control line contains four differently colored wires.
wire in control line assignment
red +24V DC (supply voltage, max 7A)
blue GND (24V)
white
voltage input: 0V to 10V DC or
PWM: 5V to max. 24V
(depending on the control signal input for
motor speed)
black GND Signal
Selecting the control signal input:
(PWM / voltage / internal setting)
To select a control signal input other than the factory set one (PWM), the
control line at the terminal board has to be reconnected.