Grundfos CRE User Manual

"Digital inputs"
"Setpoint"
2 3 4
0 0 0 Normal setpoint or stop
1 0 0 "Predefined setpoints"
0 1 0 "Predefined setpoints"
1 1 0 "Predefined setpoints"
0 0 1 "Predefined setpoints"
1 0 1 "Predefined setpoints"
0 1 1 "Predefined setpoints"
1 1 1 "Predefined setpoints"
0: Open contact
1: Closed contact
Example
The figure below shows how you can use the digital inputs to set
seven predefined setpoints. Digital input 2 is open and digital inputs
3 and 4 are closed. If you compare with the table above, you can
see that "Predefined setpoints" is activated.
0
1
2
3
4
5
6
7
A
B
C
D
E
F
G
H
I
J
K
M
L
TM080918
Principle sketch showing how predefined setpoints function
Pos. Description
A Digital input 4
B Digital input 3
C Digital input 2
D Actual setpoint
E Setpoint 7
F Setpoint 6
G Setpoint 5
H Setpoint 4
I Setpoint 3
J Setpoint 2
K Setpoint 1
L Stop
M Normal setpoint
If all digital inputs are open, the pump stops or runs at the normal
setpoint. Set the desired action with Grundfos GO Remote or with
the advanced operating panel.
Factory setting
See the section on factory settings.
Related information
9.2 Factory settings
8.15
"Limit-exceeded function"
Pump variant
"Limit-exceeded
function"
CME ●
CRE, CRIE, CRNE, CRKE, SPKE,
MTRE
●
This function can monitor a measured parameter or one of the
internal values such as speed, motor load or motor current. If a set
limit is reached, a selected action can take place. You can set two
limit-exceeded functions meaning that you can monitor two
parameters or two limits of the same parameter simultaneously.
The function requires setting of the following:
"Measured"
Here you set the measured parameter which is to be monitored.
"Limit"
Here you set the limit which activates the function.
"Hysteresis band"
Here you set the hysteresis band.
"Limit exceeded when"
Here you can set if you want the function to activate when the
selected parameter exceeds or drops below the set limit.
• "Above limit".
The function is activated if the measured parameter exceeds the
set limit.
• "Below limit".
The function is activated if the measured parameter drops below
the set limit.
"Action"
If the value exceeds a limit, you can set an action. You can select
the following actions:
• "No action".
The pump remains in its current state. Use this setting if you
only want to have a relay output when the limit is reached. See
the section on relay outputs.
• "Warning/alarm".
A warning is given.
• "Stop".
The pump stops.
• "Min.".
The pump reduces speed to minimum.
• "Max.".
The pump increases speed to maximum.
Detection delay
You can set a detection delay which ensures that the monitored
parameter stays above or below a set limit in a set time before the
function is activated.
Resetting delay
The resetting delay is the time from which the measured parameter
differs from the set limit including the set hysteresis band and until
the function is reset.
Example:
The function is to monitor the outlet pressure from a CRE pump. If
the pressure is below 5 bar for more than 5 seconds, a warning
must be given. If the outlet pressure is above 7 bar for more than 8
seconds, reset the limit exceeded warning.
48
English (US)

Grundfos CRE Specifications

General

Protection Class	IP55
Material	Stainless Steel
Applications	Water supply, pressure boosting, irrigation
Impeller Material	Stainless Steel
Pump Housing Material	Stainless Steel
Connection Size	DN32 to DN200 (depending on model)
Power Supply	3-phase
Control	Integrated frequency converter