HIGH/LOW LIMIT OPERATION
HIGH/LOW LIMIT OPERATION
If Hi.Lo is selected for OUT1, the unit will perform high/low limit control. When
power is applied the OUT1 relay is de-energized. After 6.5 seconds self-test
period, if the process is below the high limit set point (HSP1) and above the
low limit set point (LSP1), the output 1 relay will be energized and OP1
indicator will go off. If the process goes above the high limit set point or
below the low limit set point, the relay will be de-energized, the OP1
indicator will go on and the display will show the process value. After the
process is within the normal operation range, and the RESET key is pressed
or the remote reset input is applied, the relay will be energized and the
OP1 indicator will go off. NOTE: Hysteresis is safe-sided.
LSP1+O1.HY
HSP1
LSP1
HSP1
O1.HY
ON
OFF
OUT1 Relay
A, B, C, D, E, F =Reset is applied
O1.HY= Output1 hysteresis
Figure 1-6 High/Low Limit Operation
Figure 1-6 High/Low Limit Operation
A
B C
D
E F
15
UM L91-Rev 8
