Siemens SWT-3000 - Description of the Operating Modes with Unblocking Mode; Mode1 (Double System Protection); Mode2 (Single-Phase Protection)

Functional Description SWT 3000 Equipment Manual
Page - 26 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Description of the operating modes with unblocking mode
The following abbreviations are used in the description of the modes that follows:
uncoded frequency to be transmitted in the uncoded mode: (fg is the guard tone, fs is
the frequency for clock synchronization)
coded frequencies to be transmitted in the coded mode: (fg is the guard tone)
tunbl. duration of the unblocking pulse (unblocking inactive when tunbl=0,
unblocking active when tunbl>0)
BI[x] Binary input 1...4
Co[x] Command output 1...4
Mode1 (Double system protection)
Table 14: Logic scheme for the Mode1 (Double system protection) with unblocking mode
Activated
Input
Transm.
uncoded
Transm.
coded
Command output in the remote station
tunbl>0
3)
all off fg fg CO3
BI1 f1 f
s
+f
4
CO1
BI2 f2 f
s
+f
5
CO2
BI1+BI2 f4 f
s
+f
6
CO1+CO2
BI3
1)
x
--- --- --- Alarm signaling +Unblocking pulse at CO4
BI4
2)
fg fg CO3
Usynch fs f
s
+f
7
---
1) x = No reaction (does not trigger alarm)
2) With AMP operation (PLC connection) signal S6 is also activated (“Energized“) through BI4=on and voice transmission
is interrupted.
3) if an invalid frequency or code is received resp. in case of guard tone alarm: If tunbl>0 output of the unblocking pulse
(tunbl. = Duration of the unblocking pulse)
Mode2 (Single-phase protection)
Table 15: Logic scheme for the Mode2 (Single-phase protection) with unblocking mode
activated
Input
Transm.
uncoded
Transm.
coded
Command output in the remote station
tunbl>0
2)
all off fg fg ---
BI1 f1 f
s
+f
4
CO1
BI2 f2 f
s
+f
5
CO2
BI3 f3 f
s
+f
6
CO3
BI1 + BI2 or BI1 +
BI3 or BI2 + BI3
or BI1+BI2+BI3
f4 f
s
+f
7
CO1+CO2+CO3
--- --- ---
Alarm signaling
2)
+Unblocking pulse at CO4
BI4
1)
fg fg ---
Usynch fs f
1
+f
4
---
1) In AMP operation (PLC connection) signal S6 is also activated (“Energized“) through BI4=on and voice transmission is
interrupted.
2) if an invalid frequency or code is received resp. in case of guard tone alarm: If tunbl>0 output of the unblocking pulse
(tunbl. = Duration of the unblocking pulse)