Pulse Flowmeter" ("Pulse Flowmeter Setup"); Ramps; Standstill Heating; Motor Bearing Monitoring - Grundfos CRE Notice D'installation Et De Fonctionnement

7.19 "Pulse flowmeter" ("Pulse flowmeter setup")

Pump variant
CME
CRE, CRIE, CRNE,
CRKE, SPKE, MTRE
You can connect an external pulse flowmeter to one of the digital
inputs in order to register the actual and accumulated flows.
Based on this, you can also calculate the specific energy.
To enable a pulse flowmeter, set one of the digital-input functions
to "Accumulated flow" and set the pumped volume per pulse. See
Digital inputs"
section 7.7 " .
Factory setting
See section 10. Technical data.

7.20 "Ramps"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
The ramps determine how quickly the pump can accelerate and
decelerate during start-stop or setpoint changes.
You can set the following:
• acceleration time, 0.1 to 300 seconds
• deceleration time, 0.1 to 300 seconds.
The times apply to the acceleration from 0 rpm to maximum
(fixed) speed and the deceleration from maximum (fixed) speed
to 0 rpm, respectively.
At short deceleration times, the deceleration of the pump may
depend on load and inertia as there is no possibility of actively
braking the pump.
If the power supply is switched off, the deceleration of the pump
only depends on load and inertia.
Speed
Fixed
maximum
User-set
maximum
User-set
minimum
0
Fixed initial
ramp
User-set
ramp-up
Fig. 74 "Ramp-up" and "Ramp-down"
Factory setting
See section 10. Technical data.
52
"Pulse flowmeter"
("Pulse flowmeter setup")
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"Ramps"

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Time
Fixed final
ramp
User-set
ramp-down

7.21 "Standstill heating"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
You can use this function to avoid condensation in humid
environments. When you set the function to "Active" and the
pump is in operating mode "Stop", a low AC voltage is applied to
the motor windings. The voltage is not high enough to make the
motor rotate but ensures that sufficient heat is generated to avoid
condensation in the motor including the electronic parts in the
drive.
Remember to remove the drain plugs and fit a cover
over the motor.
Factory setting
See section 10. Technical data.

7.22 "Motor bearing monitoring"

You can set the motor bearing monitoring function to these
values:
• "Active"
"Not active".
•
When the function is set to "Active", a counter in the controller
starts counting the mileage of the bearings.
The counter continues counting even if the function is
changed to "Not active", but a warning will not be
given when it is time for replacement or relubrication.
When the function is changed to "Active" again, the
accumulated mileage is again used to calculate the
replacement or relubrication time.
Factory setting
See section 10. Technical data.

"Standstill heating"

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