Precision Digital PD865 - Manual (Page 44)

PD865 Snooper Modbus Serial Input Meter Instruction Manual
44
Time Delay Operation
The following graphs show the operation of the time delay function.
Set
Reset
Relay
LED
*
Input
On Time Delay
>=Tdelay
Set
Reset
Relay
Input
Off Time Delay
>=Tdelay
LED
*
If the signal crosses the set point, the On time delay timer starts and the
relay trips when the time delay has elapsed. If the signal drops below
the set point (high alarm) before the time delay has elapsed, the On
time delay timer resets and the relay does not change state. The same
principle applies to the Off time delay.
* Note: The LED is not affected by Time Delay when “Automatic or
Manual” reset mode is selected. Rather the LED follows the set
and reset points.