Endress+Hauser Ceraphant PTP31B - Page 33

Ceraphant PTP31B, PTP33B Commissioning
Endress+Hauser 33
Note The hysteresis is implemented using the "SP1/SP2" and "RP1/RP2" parameters. Since the
parameter settings depend on one another, the parameters are described all together.
• SP1 = switch output 1
• SP2 = switch output 2 (optional)
• RP1 = switchback point 1
• RP2 = switchback point 2 (optional)
1
2
0
SP1/SP2
RP1/RP2
0
HNO
p
t
1
HNC
A0022943
 1 SP1/SP2: switch point 1/2; RP1/RP2: switch-back point 1/2
0 0-signal. Output open in quiescent state.
1 1-signal. Output closed in quiescent state.
2 Hysteresis
HNO Closing
HNC NC contact
Description The switch point "SP1/SP2" and the switchback point "RP1/RP2" can be defined with these
functions (e.g. for pump control).
When the set switch point "SP1/SP2" is reached (with increasing pressure), an electrical
signal change takes place at the switch output.
When the set switchback point "RP1/RP2" is reached (with decreasing pressure), an
electrical signal change takes place at the switch output.
The difference between the value of the switch point "SP1/SP2" and the switchback point
"RP1/RP2" is known as the hysteresis.
Prerequisite • These functions are only available if the hysteresis function has been defined for the
switch output.
• The configured value for the switch point "SP1/SP2" must be greater than the switchback
point "RP1/RP2"!
A diagnostic message is displayed if a switch point "SP1/SP2" is entered that is ≤ the
switchback point "RP1/RP2". While it is possible to make this entry, it does not take
effect in the device. The entry must be corrected!
Note To prevent constant switch-on and switch-off if values are around the switch point "SP1/
SP2" and switchback point "RP1/RP2", a delay can be set for the relevant points. See the
parameter description for "dS1/dS2" and "dR1/dR2" for this purpose.
Selection No selection. The user is free to edit the values.
Factory setting Factory setting (if no customer-specific setting is ordered):
Switch point SP1: 45 %; switchback point RP1: 44.5 %
Switch point SP2: 55 %; switchback point RP2: 54.5 %