Digital Inputs - Grundfos CRE Installation And Operating Instructions Manual

8.7 "Digital inputs"

Pump variant
CME
CRE, CRIE, CRNE, CRKE, SPKE, MTRE
Available inputs depend on the functional module fitted in the pump:
Function (terminal)
"Digital input 1, setup" (2 and 6)
"Digital input 2, setup" (1 and 9)
1) See the section on the identification of functional module.
To set a digital input, make the settings below.
Function
Select one of these functions:
• "Not active". When set to "Not active", the input has no function.
• "External stop". When the input is deactivated (open circuit), the
pump stops.
• "Min." (minimum speed). When the input is activated, the pump
runs at the set minimum speed.
• "Max." (maximum speed). When the input is activated, the pump
runs at the set maximum speed.
• "External fault". When the input is activated, a timer is started. If
the input is activated for more than 5 seconds, the pump is
stopped and a fault is indicated. This function depends on input
from external equipment.
• "Alarm resetting". When the input is activated, a possible fault
indication is reset.
• "Dry running". When this function is selected, lack of inlet
pressure or water shortage can be detected. When lack of inlet
pressure or water shortage (dry running) is detected, the pump
is stopped. The pump cannot restart as long as the input is
activated. This requires the use of an accessory, such as these:
- a pressure switch installed on the inlet side of the pump
- a float switch installed on the inlet side of the pump.
• "Accumulated flow". When this function is selected, the
accumulated flow can be registered. This requires the use of a
flowmeter which can give a feedback signal as a pulse per
defined volume of water. See the section on setting up the pulse
flowmeter.
• "Predefined setpoint digit 1" (applies only to digital input 2).
When digital inputs are set to predefined setpoint, the pump
operates according to a setpoint based on the combination of
the activated digital inputs. See the section on predefined
setpoints.
The priority of the selected functions in relation to each other
appears from the section on the description of settings.
A stop command always has the highest priority.
Activation delay
Select the activation delay (T1).
It is the time between the digital signal and the activation of the
selected function.
Range: 0-6000 seconds.
40
"Digital inputs"
●
●
1) 1)
FM 200 FM 300
(standard) (advanced)
● ●
- ●
Duration timer mode
Select the mode. See the figure below.
• "Not active"
• active with interrupt (mode A)
• active without interrupt (mode B)
• active with after-run (mode C).
Select the duration time (T2).
It is the time which, together with the mode, determines how long
the selected function is active.
Range: 0 to 15,000 seconds.
TI > T1 + T2
DI
TI
A
T1 T2
B
T1 T2
C
T1 T2
Duration timer function of digital inputs
Pos. Description
T
TI
input
DI Digital input
A, B, C Modes
Factory setting
See the section on factory settings.
Related information
3.2.2 Identification of functional module
8.14 "Predefined setpoints"
8.19 "Pulse flowmeter" ("Pulse flowmeter setup")
9.1 Priority of settings
9.2 Factory settings
TI < T1 + T2
TI
T1
T1 T2
T1 T2