SMC Networks ZSE50F Manual page 8

ZSE50F/ISE50
Series
Auto Shift Function
This function uses the measured pressure at the time of auto shift
input as the reference pressure value and corrects the set point
values "P_1" and "P_2" of switch output 1 and "P_3" and "P_4" of
switch output 2. "P_1" to "P_4" correspond to "n_1" to "n_4" in
case of normally closed circuit.
When auto shift is not used:
Fluctuations in the primary pressure interrupt correct judgment.
Normal primary pressure Drop of primary pressure Increase of primary pressure
P1
P2
ON
Switch output 1, 2
OFF
When auto shift is used:
When the primary pressure changes, set the auto shift function to
Lo. The pressure value at this point will be saved as the reference
value to correct the pressure set point values in order to make
correct judgments.
Normal primary pressure Drop of primary pressure Increase of primary pressure
P1
P2
ON
Switch output 1, 2
OFF
Hi
Auto shift input
Lo
Anti-chattering Function
A large bore cylinder or ejector consumes a large amount
of air in operation and may experience a temporary drop in
the primary pressure. This function prevents detection of
such temporary drops in primary pressure as abnormal
pressure.
<Principle>
This function averages pressure values measured during
the response time set by the user and then compares the
average pressure value with the pressure set point value
to output the result on the switch.
5
Time
Time
5ms 10ms [ Switch output response time
or more or less
when auto shift inputs.
Auto shift function conditions and explanation
⋅
Keep the pressure constant at least for 5 ms after the last
⋅ transition signal of auto shift input.
At the time of auto shift input, the display unit displays "
about 1 second. The pressure value at this time is saved as the
⋅
correction value "C_5" .
The set point values "P_1" to "P_4" or "
⋅ corrected based on the saved correction values.
The time between the auto shift input and start of switch output
⋅ is 10 ms or less.
If the set point value corrected by auto shift input falls out of the
possible set range, the correction value is not saved. The
display will show "UUU" if the set point value is above the upper
⋅ limit and "LLL" if it is below the lower limit.
The correction value "C_5" set by auto shift input disappears
⋅ when the power is turned off.
The correction value "C_5" for the auto shift function is reset to
zero (the initial value) when the power is turned on again.
∗The correction value is not stored on the EEPROM.
The possible set range for types with auto shift function is as follows:
Regulating pressure range
100.0 to 100.0kPa
0.1 to 1.000MPa
]
Pressure
P1
Set point value
P2
<Averaging process>
ON
Switch output
operation in
OFF
normal conditions
Switch output
operation when
ON
chattering prevention
function is on OFF
_1" to "
n
The possible set range for types with auto shift function
100.0 to 100.0kPa
1.000 to 1.000MPa
Temporary fluctuation
t (ms) t (ms)
<Averaging process>
" for
ooo
_4" are
n
Time
Time
Time