Xylem 2 Pump Booster Sets GXS20, GMD20, GMY20 - Manual (Page 15)

Figure 1 represents front of single-phase panel
Pos Description fig. 1 Symbol
1 Main switch
2 Red dry running warning light
3 Green power warning light
4 Manual-Off-Automatic pump selector
switch
5 Green pump running indicator light
GMD20,GMY20 Three-Phase Version
The three-phase version has a QMD20,QMY20 control panel:
- Automatic sequential pump regulation with low-pressure control from two pressure switches.
- Cyclic changeover of first pump to be started.
- Changeover lock selector switch.
- Delay to prevent simultaneous start-up.
- Short-circuit and overload protection via an automatic switch.
- Dry running protection via a pressure switch or float switch or level sensors with sensitivity adjustment
(accessory electrodes not included).
- Dry running protection cut-in timer.
- Shut-down delay timers on both pumps
- Output for dry contact relay card (accessory)
- Electromechanical selector switches for Automatic-Off-Manual operation (Inside panel)
Figure 2 represents front of three-phase panel
Pos Description fig. 2 Symbol
1 Main switch
2 Green power warning light
3 Red dry running warning light
4 Red overload warning light
5 Green pump running indicator light
6 Automatic mode pushbutton
7 Manual mode pushbutton
8 Green automatic mode indicator light
9 Red manual mode indicator light
10 Manual mode on/off pushbuttons
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