Burkert Type 8620 - Manual (Page 74)

mxCONTROL Type 8620
Page 74
13.1.3 Relay as PWM Output
Time t
T1
T2 T2 T2
Relay
dropout
Relay
activated
Relay Output (break contact)
with constant time (T2)
T1 T1 T1
Inv = No
Time t
T1
T2 T2 T2
Relay Output (break contact)
with constant time (T2)
T1 T1
Inv = Yes
Relay
activated
Relay
dropout
T2 = Tperiod
T1 – variable
T2 – constant
T2 = Tperiod
T1 – variable
T2 – constant
Pulse Width modulated
(PWM) outputs are used for
controlling the 2-point-valves
which are necessary for PI-
controlling of the conductivity.
The figure shows the
operational mode of the PWM
outputs.
Figure 22:
Relay as PWM output –
Operating mode: Normal or
inverted
13.1.4 Configuration (CodeLevel: Specialist)
Configuration Access
via Cfg.-
menu Access
via XML-
Cfg.-File Abbre-
viation
(menu) Value range Default values
(after factory reset or
at start of Cfg-File-
Download)
Enabling / disabling
output rw rw Output On/Off Off
Relay Output Type rw rw Type On/Off, PFM, PWM enable/disable
Inversion of the output
signal rw rw Inv Yes / No No
Additional configuration, if Relay Output Type = PFM selected
Unit pulse duration
rw rw Tpuls Unit s, ms ms
Pulse duration rw rw Tpuls 1 … 9999 100 ms
Unit
Max. pulse frequency rw rw Fmax Unit /min, /h /min
Max pulses per time rw rw Fmax 1 … MAX
MAX <= 9999 and MAX
depend on the current
unit and pulse duration:
MAX = 1/Tpuls with
Tpuls in units of 1/(unit of
Fmax) 160/min
Additional configuration, if Relay Output Type = PWM selected
Unit of period duration
rw rw Tperiod
Unit s, ms s
period duration rw rw Tperiod 1 … 9999 s or
100 … 9999 ms 10 s