Programming
Page 36
May 2020
DSY-PM-01378-EN-08
At the
HystSP1
prompt, press
ENTER
� The most significant digit of the current setting
flashes� If the current setting is correct, press
ENTER
to advance to the next parameter� To
change the current setting, press
RIGHT
to advance to the first digit of the new hysteresis
value� Press
UP
to increment the digit until it matches the first number of the new
hysteresis� Repeat for all the digits of the hysteresis and then press
ENTER
to advance to the
TripSP1
parameter�
Minimum
Flow
Maximum
Flow
Output ON
OFF S
etpoin
t
ON S
etpoin
t
Hysteresis
Output OFF
Figure 16: Set point actions
OTE:
N
Neither the set point nor the hysteresis values are checked for compatibility
with the meter size� Check the values to prevent the outputs from
working unexpectedly�
Trip SP 1
The trip parameter can be set for either
High
or
Lo
� When set to
High
, the open collector
transistor stops conducting and sends the output high when the set point is reached�
The output will not go low again until the flow rate falls below the set point minus the
hysteresis value� When set to
Lo
, the open collector transistor starts conducting and sends
the output low when the set point is reached� The output will not go high again until the
flow rate exceeds the set point plus the hysteresis value�
For example, if the set point is 10 gpm, the hysteresis is set to 2 gpm and the trip set point
is set to
High.
See
� When the flow goes above 10 gpm, the OC transistor stops
conducting and the output goes high� The output stays high until the flow rate drops below
8 gpm, which is the set point (10 gpm) minus the hysteresis (2 gpm)�
Minimum
Flow
Maximum
Flow
Output ON
OFF (8 g
pm)
Setpoin
t (10 g
pm)
Hysteresis
(2 gpm)
Output OFF
Figure 17: Set point example
