POWER ELECTRONICS
SDRIVE 700
DESCRIPTION OF PROGRAMMING PARAMETERS
91
10.20.12.
Subgroup 25.6 – S25.6: Protection
Parameter
Name /
Description
Range
Default
value
Function
Set on
RUN
1 PAUSE/DEL=20s
DELAY AFTER PAUS
G25.6.1
/ Delay
time after
protection pause
0 to 999s
20s
It allows setting a delay time value before the drive starts after
stopping by protection pause.
This delay time starts elapsing once the cause that produced the
pause disappears. For example: A pause was generated due to an
over-pressure. Once the over-pressure condition disappears, delay
time set here will start elapsing and when this time is elapsed, the
SD700 will start. This delay time will be applied to all of the pauses:
High pressure (analogue feedback), if it is set to PAUSE.
Cavitation, if it is set to PAUSE.
No Flow switch, if it is set to PAUSE.
Note:
In case of ‘Cavitation’, when the equipment goes into Pause,
it is stopped and, therefore, it is not possible to continue monitoring
values, so that, as soon as the equipment stops, delay time starts
elapsing and when this time is elapsed the equipment will start.
YES
2 CAVITATION=N
G25.6.2
/ To
enable cavitation
protection
N
Y
N
It allows the possibility of protecting the pump from cavitation status.
OPT
FUNCTION
N=NO Cavitation
protection disabled.
Y=YES Cavitation
protection enabled.
To protect the pump by entering of cavitation status is necessary to
follow the next steps:
Set this parameter to ‘YES’.
Set a cavitation current value (in G25.6.4) below which the first
detection condition will be met.
Set a cavitation speed value (in G25.6.5) above which the second
detection condition will be met.
Set a delay time to activate cavitation protection, once elapsed, last
cavitation condition will be activated.
Set a pause time to deactivate cavitation protection. In that moment,
drive will try to start again.
If three previous conditions are given, the drive will stop the pump to
protect it from cavitation status (no water).
YES
3 CAV MODE=FAULT
G25.6.3
/
Response from
cavitation
PAUSE
FAULT
FAULT
It allows selecting the drive response from a cavitation situation.
OPT
FUNCTION
PAUSE
It will generate that the drive stops firstly, and
next, the fixed pumps. ‘CAVITATION PAUSE’ will
be displayed. Once elapsed the delay time after
pause, the drive will start.
FALLO
It will generate a fault, and next, the fixed pumps
will stop. In this case, the visualization will be ‘F68
CAVIT/UNDERL’.
YES
4 CAV CURR=___A
CAVITATION CURRE
G25.6.4
/
Cavitation
current
(0.2 to
1.50)·In
∗
Setting of the cavitation current below which the first detection
condition to activate the protection is met. This parameter operates
together with parameters G25.6.5 and G25.6.6. See note below.
YES
∗
This value depends on the drive size.
Note: To adjust cavitation parameters, Power Electronics recommends, whenever it is possible, follow the next steps:
If the load is variable, adjust the application for the most frequent load value, for example, select a middle
consumption for an irrigation water pump.
Start the drive at manual speed.
Set the drive speed to the minimum functional speed (minimum flow in case of pumps) or to the minimum
operation level of your application.
Make a note of the output current and the motor speed.
Set the cavitation speed to the speed that you have made a note before.
Set the cavitation current to 6% less than the current that you have made a note before.
Set the desired activation time, for example, 10s.
Check the system, if it is necessary, set the parameters for an optimum response again.
