Grundfos CIU 501 Instructions

English (GB)
26
10. Detailed descriptions of registers
10.1 Control mode
The supported control modes are described further in this
section. The control mode is set with register 00102 and its status
can be read from register 00203.
H: Pressure (head)
Q: Flow
Control modes Description Illustration
> Constant speed (0)
> Constant frequency (1)
Open loop
The setpoint of the E-pump will be interpreted as
setpoint for the performance.
The setpoint value is a percentage of the maximum
performance of the E-pump.
No sensor is required in these modes.
TM04 2289 2208
> Constant head (3)
> Constant pressure (4)
> Constant differential pressure (5)
Closed loop
The setpoint of the E-pump will be interpreted as
setpoint for the pressure.
The E-pump will adapt the speed so that the pressure is
constant, regardless of the flow.
A pressure sensor is required.
TM04 2290 2208
> Constant flow (7)
> Constant temperature (8)
> Constant level (10)
Closed loop
The setpoint of the E-pump will be interpreted as
setpoint for the flow, temperature or level. Constant flow
is indicated in the diagram.
A relevant sensor is required:
• A flow sensor for flow control
• a temperature sensor for temperature control
• a level sensor for level control.
TM04 2288 2208
> Proportional pressure (6)
Closed loop
The setpoint of the E-pump will be interpreted as
setpoint in proportional-pressure mode as shown in the
diagram.
A pressure sensor is required.
TM04 2291 2208
> AUTO
ADAPT
(128)
In this control mode, the setpoint curve is a proportional-
pressure curve where the setpoint has been set from
factory. The AUTO
ADAPT
algorithm in the pump will, over
time, optimise the setpoint value according to the pipe
characteristics of the system. The setpoint curve will
always be adjusted in a downward direction.
TM05 3241 1012
>FLOW
ADAPT
(129)
This control mode works similar to AUTO
ADAPT
, except
that the flow-limiting function, FLOW
LIMIT
, is always
active and limits the flow to the value
ActualMaxFlowLimit.
TM05 3242 1012
> Closed-loop sensor (130)
This is a general purpose closed-loop control mode that
can be used in cases where the pump is used for a type
of control not covered by one of the other control modes.
H
Q
H
Q
H
Q
H
Q
Q
H
H
Q

Grundfos CIU 501 Specifications

General

Brand	Grundfos
Model	CIU 501
Category	Controller
Language	English