3UG4622-1AW30 Datasheet, PDF (48/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

3RP, 7PV Timing Relays
General data
3RP15 function table
Possibilities of operation of the 3RP15 60-1S.30 timing relay
Timing relay energized
Contact closed
Contact open
Operation 1
A./A2
B./A2
17/18
Y
17/28
17/16
t _Y 50 ms
t Idling
t _Y 50 ms
Operation 2
A./A2
B./A2
17/18
Y
17/28
17/16
Operation 3
A./A2
B./A2
17/18
Y
17/28
17/16
Operation 4
A./A2
B./A2
17/18
Y
17/28
t _Y 50 ms
t _Y 50 ms
t _Idling
t Idling
t _Idling
t_Y
t_Idling
= star time
1 to 20 s
= idling time (overtravel time) 30 to 600 s
Operation 1:
Start contact B./A2 is opened when supply voltage A./A2 is applied.
The supply voltage is applied to A./A2 and there is no control signal on
B./A2. This starts the *D timing. The idling time (overtravel time) is
started by applying a control signal to B./A2. When the set time I_Idling
(30 to 600 s) has elapsed, the output relays (17/16 and 17/28) are reset.
If the control signal on B./A2 is switched off (minimum OFF period
270 ms), a new timing is started.
Comments:
Observe response time (dead time) of 400 ms on energizing supply
voltage until contacts 17/18 and 17/16 close.
300 ms
Operation 2:
Start contact B./A2 is closed when supply voltage A./A2 is applied.
If the control signal B./A2 is already present when the supply voltage
A./A2 is applied, no timing is started. The timing is only started when the
control signal B./A2 is switched off.
Operation 3:
Start contact B./A2 closes while star time is running.
If the control signal B./A2 is applied again during the star time, the idling
time starts and the timing is terminated normally.
NSB00892
Operation 4:
Start contact B./A2 opens while delta time is running and is applied
again.
If the control signal on B./A2 is applied and switched off again during
the delta time, although the idling time has not yet elapsed, the idling
time (overtravel time) is reset to zero. If the control signal is re-applied to
B./A2, the idling time is restarted.
NSB00893
Application example based on standard operation (operation 1)
For example, use of 3RP15 60 for compressor control
Frequent starting of compressors strains the network, the machine, and
the increased costs for the operator. The new timing relay prevents
frequent starting at times when there is high demand for compressed
air. A special control circuit prevents the compressor from being
switched off immediately when the required air pressure in the tank has
been reached. Instead, the valve in the intake tube is closed and the
compressor runs in "Idling" mode for a specific time which can be set
from 30 to 600 s.
If the pressure falls within this time, the motor does not have to be
restarted again, but can return to nominal load operation from no-load
operation.
If the pressure does not fall within this idling time, the motor is switched
off.
the pressure switch controls the timing via B./A2.
The supply voltage is applied to A./A2 and the start contact B./A2 is
open, i.e. there is no control signal on B./A2 when the supply voltage is
applied. The pressure switch signals "too little pressure in system" and
starts the timing by way of terminal B./A2. The compressor is started,
enters *D operation, and fills the pressure tank.
When the pressure switch signals "sufficient pressure", the control signal
B./A2 is applied, the idling time (overtravel time) is started, and the
compressor enters no-load operation for the set period of time between
30 to 600 s. The compressor is then switched off. The compressor is
only restarted if the pressure switch responds again (low pressure).
17/16
t _Y 50 ms < t Idling
< t _Idling
t _Idling
The following applies to all operations:
The pressure switch controls the timing via B./A2.
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Siemens LV 1 T · 2006