Control Functions; Displays In General; Menu Operation - Grundfos CRE Serie Notice D'installation Et De Fonctionnement

4. Control functions

4.1 Displays in general

In the following explanation of the functions, one or two displays
are shown.
One display
Pumps without or with factory-fitted sensor have the same
function.
Two displays
Pumps without or with factory-fitted pressure sensor have
different functions and factory settings.
4.2 Menu
OPERATION
The first display in this menu is this:
4.2.1 Setpoint
Without sensor
(uncontrolled)
Setpoint set
Actual setpoint
Actual value
Set the setpoint in %.
In control mode uncontrolled, the setpoint is set in % of the
maximum performance. The setting range will lie between the
min. and max. curves.
In control mode controlled, the setting range is equal to the
sensor measuring range.
If the pump is connected to an external setpoint signal, the value
in this display will be the maximum value of the external setpoint
signal. See section 4.8 External setpoint signal.
Setpoint and external signal
The setpoint cannot be set if the pump is controlled via external
signals (Stop, Min. curve or Max. curve). R100 will give this
warning: External control!
Check if the pump is stopped via terminals 2-3 (open circuit) or
set to min. or max. via terminals 1-3 (closed circuit).
See fig. 23.
Setpoint and bus communication
The setpoint cannot be set either if the pump is controlled from an
external control system via bus communication. R100 will give
this warning: Bus control!
To override bus communication, disconnect the bus connection.
See fig. 23.
12
With pressure sensor
(controlled)
Setpoint set
Actual setpoint
Actual value
Set the desired pressure in
bar.
4.2.2 Operating mode
Set one of the following operating modes:
• Normal (duty)
• Stop
• Min.
• Max.
The operating modes can be set without changing the setpoint
setting.
4.2.3 Fault indications
In E-pumps, faults may result in two types of indication: alarm or
warning.
An "alarm" fault will activate an alarm indication in R100 and
cause the pump to change operating mode, typically to stop.
However, for some faults resulting in alarm, the pump is set to
continue operating even if there is an alarm.
A "warning" fault will activate a warning indication in R100, but
the pump will not change operating or control mode.
The indication, Warning, only applies to three-phase
pumps.
Alarm
In case of alarm, the cause will appear in this display.
Possible causes:
• No alarm indication
• Too high motor temperature
• Undervoltage
• Mains voltage asymmetry (20-30 hp)
• Overvoltage
• Too many restarts (after faults)
• Overload
• Underload
• Sensor signal outside signal range
• Setpoint signal outside signal range
• External fault
• Duty/standby, Communication fault
• Dry running
• Other fault.
If the pump has been set up to manual restart, an alarm indication
can be reset in this display if the cause of the fault has
disappeared.