Signal-Detection Time; Setting The Maximum Number Of Restarts With Grundfos Go Remote; Setting The Service Interval With Grundfos Go Remote; Motor Protection - Grundfos CU 241 Instrucciones De Instalación Y Funcionamiento

ensures that the pump starts as often as set in Anti-seizing > >
Interval. The pump will operate for the number of seconds
indicated by the user.
6.11.1 Setting the "Anti-seizing" function with Grundfos GO
Remote
1. Go to Settings > Anti-seizing.
2. Set the function to Enabled.
3. Set the time interval.
4. Set the operating time.

6.12 Signal-detection time

The signal-detection time is the minimum time a level has to be
active before the control unit initiates an action, such as starting or
stopping a pump.
6.12.1 Setting the signal-detection time with Grundfos GO
Remote
1. Go to Settings > Level control > Signal detection time.
2. Set the signal-detection time.
6.13 Setting the maximum number of restarts with
Grundfos GO Remote
If the pump is seized up as a result of deposits buildup, it will be
stopped automatically due to overheating, provided that the motor
protection has been set. When the motor has cooled down, the
control unit will unsuccessfully try to restart the pump and this
scenario will be repeated.
In order to prevent this, it is possible to set a maximum number of
restart attempts within a set interval.
1. Go to Settings > Max number of restarts.
2. Enable the function.
3. Set the interval within which the allowed number of restarts are
to be counted.
4. Set the maximum number of pump restarts which are allowed
during the set interval.
Related information
6.15.4 Setting the motor protection with Grundfos GO Remote
9.3 Code 4 (Too many motor restarts)
6.14 Setting the service interval with Grundfos GO
Remote
You can set a time in Grundfos GO Remote in order to get a
reminder that the pump needs service when the time comes.
1. Go to Settings > Service > State
2. Select Enable and press OK.
3. Select the pump.
4. Enter the number of hours until next service and press OK.

6.15 Motor protection

6.15.1 Overheat protection
The control unit offers thermal protection for the connected motors.
Two types of thermal-protection sensor can be connected to the
control unit: a PTC sensor (analog) and a thermal switch (digital).
Under normal running conditions, the sensor will act as a short
circuit, but when its temperature limit is reached, it will open and tell
the control unit that the temperature is too high, and the pump is
stopped. When the temperature has dropped to the sensor-trigger
level, the pump will return to normal running conditions. It will not be
possible to start the pump manually as long as the temperature is
too high.
Related information
9.10 Code 69 (Winding temperature too high)
12
6.15.2 Overload protection
The pump is protected by a motor-protection relay. The nominal
current draw must be set manually on the motor-protection relay.
See the specific documentation for the relay on how to set the
trigger level. If the current exceeds the trigger level, the relay will
switch off the pump and the controller will give an alarm. The alarm
has to be manually reset directly on the motor protection relay.
Related information
9.8 Code 48 (Motor is overloaded)
6.15.3 Moisture protection
When a moisture sensor is installed in series with the temperature
sensor, the control unit needs to know how to determine whether
there is a high temperature or moisture in the pump. If the
temperature is too high, normally the temperature sensor will go
back to its normal stage when the temperature has dropped to its
trigger level. If there is moisture in the pump, then the moisture
sensor will keep the series connection open until the pump is
opened and serviced.
To determine which sensor has been active, a cool down
time must be entered. This is the time that will normally pass until
the temperature has dropped enough for the temperature sensor to
return to its normal stage. If the cool down time is exceeded, the
control unit will assume that there is moisture in the pump, and it
will send a moisture alarm.
Related information
6.15.4 Setting the motor protection with Grundfos GO Remote
6.15.4 Setting the motor protection with Grundfos GO Remote
You can set the current, temperature and moisture protection via a
setup wizard.
1. Go to Settings > Motor protection pump 1.
2. Follow the on-screen wizard to set the following:
• Nominal pump current
• Trip IEC class
• Pump connection
• Overheat protection.
Related information
6.13 Setting the maximum number of restarts with Grundfos GO
Remote
6.15.3 Moisture protection

6.16 Alarm reset

6.16.1 Resetting alarms and warnings manually with Grundfos
GO Remote
1. Go to Alarms and warnings.
2. Press Reset alarm.
All current alarms and warnings have been reset. However, if
the fault causing the alarm or warning has not been removed,
the alarm or warning will appear again.
3. If you want to delete all alarms and warnings from the history
log, press Show log > Reset alarm and warning logs.
6.16.2 Setting the automatic alarm reset with Grundfos GO
Remote
1. Go to Settings > Automatic alarm reset.
2. Select one of the following:
No automatic reset
All except pump critical
All alarms
The control unit does not
reset any alarm or warning.
You must do it manually.
The control unit resets alarms
and warnings unless the
related fault can damage the
pump.
The control unit resets alarms
and warnings, regardless of
the fault.