Seko K500 TB Manuel D'installation page 33

a)
b)
D2) PID-PWM
If the Set Point is set as PID-PWM, Relay 1 can be used to operate a pump with ON/OFF
commands as if it were to be in proportional adjustment. This function requires the time (in
seconds) within which the PWM adjustment will be subsequently calculated to be programmed.
Maximum programmable time: 999 sec. with increments of 1 second. In order to prevent abrupt
measurement variations, it is recommended to start with shorter times and to subsequently increase
them. For the Relay's functionality with the PID-PWM function, see fig. 13.b
PID THRESHOLD
a)
RELAY ON
RELAY OFF
RELAY ON
b)
RELAY OFF
D3) PID-Frequency
If the Set Point is set as PID-Frequency, Relay 1 can be used to directly control a pump with a
pulsed input. This function requires the number of the maximum impulses/hour that the pump is
capable of accepting to be programmed. Maximum number: 7200 imp/h with increments of 200.
The time of the ON and OFF impulse is fixed and is equal to 250msec. For the Relay's functionality
with the PID-Frequency function, see fig. 14.a.
0000137221
Measurement
Figure 13 – Relay 1 functionality
Measurement
Figure 14 – Relay 1 functionality as PID
Rev. 3.1
THRESHOLD
THRESHOLD Timed with
negative times
THRESHOLD Timed with
positive times
PID Frequency
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