Datakom DPR-400 - Under Frequency Protection (Ansi 81 U); High Frequency Protection (Ansi 81 O)

DPR-400 User Manual Rev_01 Firmware V-1.0
- 36 -
The controller offers 2 levels of under frequency protection. Frequency protections can be disabled if the
breaker is open or the voltage and current of one phase are simultaneously equal to zero. Protections can
be configured as constant timer or variable timer.
The controller offers 2 levels of high frequency protection. Protections can be configured as constant
timer or variable timer.
9.16. UNDER FREQUENCY PROTECTION (ANSI 81U)
9.17. HIGH FREQUENCY PROTECTION (ANSI 81O)