Micom P634 - Over-;Underfrequency Protection (Function Group F<>); Disabling or Enabling Over-;Underfrequency Protection

3.27 Over-/Underfrequency Protection (Function Group f<>)
The P634 monitors the voltage to determine whether its frequency exceeds or
falls below set thresholds. The frequency is determined from the difference in
time between the zero crossings of the voltage (voltage zeroes). The over-/
underfrequency protection function has four stages. Subsequently, the operation
of over-/underfrequency protection will be explained using the first stage as an
example.
3.27.1 Disabling or Enabling Over‑/Underfrequency Protection
The frequency protection can be disabled or enabled using setting parameters.
Moreover, enabling can be carried out separately for each parameter subset.
F5Z0104C
f<>:
Enabled
[ 042 100 ]
f<>:
General enable USER
[ 023 031 ]
1: Yes
0
1
0: No
f<>:
Ready
[ 042 101 ]
f<>:
Not ready
[ 042 140 ]
1: Yes
0
1
0: No
f<>:
Enable PSx
[ * ]
f<>:
Enable PSx
018 196
018 197
018 198
018 199
Parameter
set 1
set 2
set 3
set 4
Fig. 3-137: Enabling, disabling and readiness of f<> protection.
3 Operation P634
P634/EN M/R-42-A // P634‑311‑653 3-185