3RP10, 3RP15 solid-state time relays
SIRIUS System Manual
GWA 4NEB 430 0999-02b
7-19
Function diagram
Figure 7-13: 3RP15 55 function diagram
7.3.6 Star-delta function (3RP15 74/76 solid-state time relay)
Description
The instantaneous star contact and the time-delayed delta contact have a
shared contact root.
To avoid phase short circuits, the switchover break from star to delta is
50 ms.
Time ranges
The time relay offers a fixed time range: 20 s, 60 s
Function diagram
Figure 7-14: 3RP15 7. function diagram
7.3.7 Star-delta function with overtravel (3RP15 60 solid-state time relay)
Description
Supply voltage is applied to A./A2 and there is no control signal at B./A2.
This starts the
*d
timing period. By applying the control signal to B./A2,
the idling time (overtravel time) is started. When the set time
t
Idling
(30 s to
600 s) is completed, the output relays (17/16 and 17/28) are reset. If the con-
trol signal is switched off at B./A2 (minimum off-time 270 ms), a new timing
period is started.
Time ranges
Star-delta time 1 s to 20 s
Overtravel time: 30 s to 600 s
Function diagram
Clock pulse generator
CLOCK PULSE
A./A2
15/18
15/16
Idle time
Interval time
Pulse time
Pulse time
Star/delta
STAR/DELTA
A./A2
17/18
17/28
A./A2
17/28
17/16
*
B./A2
17/18
Idling
50 ms
t
t
Star-delta with overtravel
STAR/DELTA with idling
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