Functions
Grundfos CUE
26
Hmax update
Setting via PC Tool.
This function is used in connection with the control
mode P
roportional differential pressure. The purpose is
to find the "true" value of the maximum head at no flow
and nominal pump speed. See fig. 32.
Fig. 32 Proportional differential pressure, H
max
update
The function consists of two steps:
1. Ramping up the speed to nominal speed.
2. Measuring Hmax for 20 seconds at nominal speed.
Valves must be closed so that the pump is operating
without flow.
Differential pressure from two
sensors
Setting via PC Tool.
The purpose of this function is to make differential pres-
sure control possible by using measurements from two
separ
ate pressure sensors.
It can be used in these control modes:
• Proportional differential pressure. See page 15
• Constant differential pressure. See page 15.
The function requires an MCB 114 sensor input mod-
ule.
Fig. 33 Differential pressure from two sensors
Sensor 1 is connected to the sensor input 1.
Sensor 2 is connected to the sensor input 2 of an MCB
114
sensor input module.
Start delay after power-up
Setting via PC Tool.
The start delay after power-up is a delay between
pow
er being applied and the pump starting.
Fig. 34 Start delay after power-up
The purpose is to allow remote control equipment to
start up before the pump.
The start delay is deactivated if a remote command is
r
eceived via GENIbus.
Auto/manual restart after alarm
Setting via PC Tool.
In case of an alarm, the CUE will stop the pump or
chang
e the operating mode, depending on the alarm
and pump type. See Warning and alarm list on page 38.
Pump operation will be resumed when the cause of the
alar
m has been remedied and the alarm has been reset
automatically or manually.
The CUE can be configured to activate and deactivate
aut
omatic restart for all alarms or for groups of alarms.
TM04 1696 0908
TM03 8804 2507TM04 0622 0908
Δp
CUE
Δp
CUE
Sensor 1Sensor 2
TM04 0621 0908
Power on:
Start CUE:
Start delay
Time
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