Dutypoint VT Booster Set, O & M Manual

Page: 70 / 123

English (GB)
12
7. Description of functions
7.1 Setpoint
You can set the setpoint for all control modes when you have
selected the desired control mode. See section
7.4 Control mode
.
Factory setting
See section
16. Factory settings
.
7.2 Operating mode
Possible operating modes:
• Normal
The pump runs according to the selected control mode.
• Stop
The pump stops.
• Min.
You can use the minimum curve mode in periods in which a
minimum flow is required. When operating according to the
minimum curve, the pump is operating like an uncontrolled
pump.
• Max.
You can use the maximum curve mode in periods in which a
maximum flow is required. When operating according to the
maximum curve, the pump is operating like an uncontrolled
pump.
• Manual
The pump is operating at a manually set speed. In "Manual"
the setpoint via bus is over-ruled. See section
7.3 Set manual
speed
.
All operating modes are illustrated in fig. 9 .
Fig. 9 Operating modes
Factory setting
See section
16. Factory settings
.
7.3 Set manual speed
This menu is only available in the advanced control panel. With
Grundfos GO, you set the speed via the "Setpoint" menu.
You can set the pump speed in % of the maximum speed. When
you have set the operating mode to "Manual", the pump will run
at the set speed.
Factory setting
See section
16. Factory settings
.
7.4 Control mode
Possible control modes:
• Constant pressure (Const. pressure)
• Constant temperature (Const. temp.)
• Constant differential pressure (Con. diff. press.)
• Constant differential temperature (Con. diff. temp.)
• Constant flow rate (Const. flow rate)
• Constant level (Const. level)
• Constant other value (Const. other val.)
• Constant curve (Const. curve.)
Factory setting
See section
16. Factory settings
.
7.4.1 Constant pressure
We recommend this control mode if the pump is to deliver a
constant pressure, independently of the flow in the system. See
fig.
10 .
Fig. 10 Constant pressure
This control mode uses the factory mounted pressure sensor, if
any, which measures the discharge pressure of the pump.
For pumps without a factory mounted sensor, you must connect a
pressure sensor to one of the analog inputs of the pump. You can
set up the pressure sensor in the "Assist" menu. See section
7.41 Assisted pump setup
.
Fig. 11 Constant pressure
Controller settings
For recommended controller settings, see section
7.11 Controller
(Controller settings)
.
Factory setting
See section
16. Factory settings
.
Pump variant Setpoint
CME ●
CRE, CRIE, CRNE, SPKE, MTRE ●
Pump variant Operating mode
CME ●
CRE, CRIE, CRNE, SPKE, MTRE ●
TM
06
40
24
15
15
Q
H
Q
H
Max.
Min.
Normal
Normal
Manual
Stop
Pump variant Control mode
CME ●
CRE, CRIE, CRNE, SPKE, MTRE ●
Pump variant Constant pressure
CME ●
CRE, CRIE, CRNE, SPKE, MTRE ●
TM
05
79
01
16
13
Examples
• One external pressure sensor.
H
Q
p
p