BE1-951
Protection and Control
4-45
Figure 4-26. 25VM Logic
must be above 0.010Hz for sync to occur. Each of these elements are described in the previous
paragraphs. Settings are made using the S<g>-25 command. These settings can also be viewed or
changed at the front panel HMI using screen 5.x.2.1 where x equals 1 for setting group 0, and 2 for setting
group 1. See Table 4-35 for the Sync-Check Function operating settings.
Table 4-35. Sync-Check Function Operating Settings
Setting
Range
Increment
Unit of measure
Default
Delta V Max
1-20
0.1
secondary volts
1
Delta Angle Max
1-45
0.1
degrees
10
Delta Freq. Max
0.01-0.5
0.01
hertz
0.01
Gen Freq.>Bus Freq.
0 = disabled,
1 = enabled
N/A
N/A
0
S<g>-25 Command
Purpose:
Read or set the Sync-Check delta volts, phase angle, slip freq and mode.
Syntax:
S<g>-25[=<Volts>,<Ang>,<Slip>,<mode>]
Comments: g = 0 for setting group 0, 1 for setting group 1, 2 for setting group 2, or 3 for setting group 3
Refer to Table 4-35 for S<g>-25 setting definitions.
25 Voltage Monitor (25VM)
Table 4-36. S#-25VM Command Settings
Setting
Range
Increment
Unit of measure
Default
LV
10 - 150
N/A
volts
60
DV
10 - 150
N/A
volts
20
Dropout TD
.050 - 60
N/A
Seconds
50
VM1
1-3, 12, 13,
23, 123
N/A
N/A
DIS
VM2
1-3, 12, 13,
23, 123
N/A
N/A
DIS
S#-25VM Command
Purpose:
Read/Set 25VM live volts, dead volts, time delay, and VM1 & VM2 logic
Syntax :
S<g>-25VM[=<LV>,<DV>,<Dropout TD>,<VM1>,<VM2>]
Comments: g = 0 for setting group 0, 1 for setting group 1, 2 for setting group 2, or 3 for setting group 3
LV = Live voltage threshold for comparison to the Line and Aux input voltages.
DV = Dead voltage threshold for comparison to the Line and Aux input voltages.
Dropout TD = Time delay between sensing dropout and clearing VM1 or VM2 logic bit.
VM1 = VM1 setting logic – 1 / 2 / 3 / 12 / 23 / 31 / 123
VM2 = VM2 setting logic – 1 / 2 / 3 / 12 / 23 / 31 / 123
The sync-check output, 25, only provides closing
supervision for the live line/live bus condition. The
voltage monitor function 25VM is provided for
conditions where the bus and/or the line are dead. A
live condition for either the VP or the VX is determined
when the measured voltage on the respective input is
above the LV threshold or is below the DV threshold.
For the phase voltage input, if the connection is three
phase, 3W or 4W, all three phases are tested and must
be above the LV threshold for a live condition to be
true. Similarly, all three phases must be below the
DV threshold for a dead condition to be true.
