4-2-1
1_ST
AR
T_LEVEL_V
ARIA
TION_141
Start level variation
Related information
8.1.4.7 Analog sensor with safety float switches
8.2.15 Anti-blocking
"Reverse start" requires either a CUE, VFD or an MP 204
and an extra set of contactors in the control cabinet.
Digital output DOx also has to be set to control the
contactor for reverse start.
"Anti-blocking" is used to prevent overheating of the motor windings
if the rotor is blocked.
In this display, "Anti-blocking" is set. This function has to be
enabled or disabled. "Reverse start time" and/or "Start flushing
time" as well as the parameters that have to generate an alarm or
warning have to be set.
"Max. flush attempts, 24 hours" also has to be set by the user.
Example
The "Anti-blocking" function is enabled, and "Reverse start time" is
set to 5 s (default).
"Max. flush attempts, 24 hours" is set to 3 (default).
Path:
Settings > Advanced functions > Anti-blocking
4-2-12_ANTI_BLOCKING_157
Anti-blocking
It is only possible to use this function when the installed
pumps are larger than 4 kW.
Related information
8.5.2.1 Description of pump alarms
8.2.15.1 Anti-blocking triggers
The parameters that have to generate an alarm or warning must be
selected. Before this function is used, a reference curve has to be
created for each parameter. To create a curve, press [OK] in the line
"Press [OK] to measure and store current pump parameters as
reference".
These measurements represent normal operation, and the
acceptable variations of these parameters must be entered. Finally,
a trigger delay has to be set. If these limits are exceeded, the alarm
or warning "Blocked" is generated, and the pump is stopped.
An alarm or warning can be generated by these parameters:
•
Current
•
Torque (a CUE is required)
•
Cos φ
•
Low flow (flowmeter or flow calculation is required)
•
Overtemperature.
The test function and the acceptable variations for the
pump parameters are only visible if either an MP 204 or a
CUE is installed in the system.
Path:
Settings > Advanced functions > Anti-blocking > Anti-
blocking triggers
4-2-12-1_TRIGGERS_158
Anti-blocking triggers
8.2.15.2 Stored pump parameters
This display is used to show the actual pump values obtained
during measurement of actual pump parameters.
Path:
Settings > Advanced functions > Anti-blocking > Stored
pump parameters
4-2-12-1-1_ST
ORED_P
ARAMETERS_161
Stored pump parameters
8.2.16 Overflow calculation
This display is used to set the overflow calculation. The function
must be enabled. See section about float switch
functions. The overflow calculation requires an analog level sensor
for measuring the water level.
If the overflow function is selected, it must be placed on digital input
DI3 on CU 362. The digital input is supplied from the backup battery
making the overflow calculation possible if the power supply fails. In
existing installations, other switches on DI3 must therefore be
moved to the next available digital input.
Activation delay is the time that has to pass before an overflow
becomes a true overflow. The activation delay can be set up to
9999 seconds (2.77 hours).
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