ABB REC650 User Manual

When the measured frequency returns to the level corresponding to the setting
RestoreFreq, a 100ms pulse is given on the output RESTORE after a settable time
delay (tRestore).
8.1.7.3 Blocking
It is possible to block underfrequency protection SAPTUF completely, by binary
input signal:
BLOCK: blocks all outputs
If the measured voltage level decreases below the setting of MinValFreqMeas in the
preprocessing function both the START and the TRIP outputs are blocked.
8.1.7.4 Design
The design of underfrequency protection SAPTUF is schematically described in
figure
79.
Figure 80: Simplified logic diagram for SAPTUF
8.1.8 Technical data
Table 139: SAPTUF Technical data
Function
Range or value Accuracy
Operate value, start function (35.00-75.00) Hz ± 2.0 mHz at
symmetrical three-
phase voltage
Operate value, restore
frequency
(45 - 65) Hz ± 2.0 mHz
Reset ratio <1.001 -
Operate time, start function At 50 Hz: 200 ms typically at f
set
+0.5 Hz to f
set
-0.5 Hz
At 60 Hz: 170 ms typically at f
set
+0.5 Hz to f
set
-0.5 Hz
-
Reset time, start function At 50 Hz: 60 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
At 60 Hz: 50 ms typically at f
set
-0.5 Hz to f
set
+0.5 Hz
-
Operate time delay (0.000-60.000)s <250 ms
Restore time delay (0.000-60.000)s <150 ms
8.2 Overfrequency protection SAPTOF
Section 8 1MRK 511 287-UEN A
Frequency protection
182
Technical manual

ABB REC650 Specifications

General

Brand	ABB
Model	REC650
Category	Control Unit
Language	English