Switchboard with Alarm for 2 Electric Pumps

Switchboard with Alarm

Control and protection of electric pumps used in hydropneumatic plants or for pumping effluents with 2 electric pumps

Presentation

Plastic box 300x250x140 mm in grey ABS RAL7035 with hinge and transparent polycarbonate lid.
WEG thermal contactors and relays.
Alternating relay for alternating and simultaneous control
Sound and light alarm included
Automatic, manual or off operation, controlled on each of the pumps independently by a 3-position switch with protective capsule.
The audible alarm operates automatically, test or off, using a 3-position switch with a protective capsule, without interfering with the light alarm.
Connection with reduced voltage (12V) for remote control of starting (C31-C32, C41-C42) and stopping (C21-C22) of motors (pressure switch, float switch or others).
Connection with reduced voltage (12V) for remote safety control (C11-C12) (pressure switch, float switch or other).
Connection with reduced voltage (12V) for remote alarm control (C51-C52) (pressure switch, float or other).
Control circuit protection via circuit breaker.
Protection of the power circuit against short circuits by means of a circuit breaker.
Protection of the power circuit against overloads through thermal relay.
Indication of phase presence in the control circuit (yellow indicator).
Individual indication of engine on (green lights).
Individual thermal trigger indication (red indicators).
Alarm on indication (red light and audible alarm)
6 Cable glands, for passing connection cables.

How it Works

Once all connections have been made correctly, the thermal relays must be adjusted according to the nominal intensities of the motors. The panel must show all signals switched off except for the presence of the control circuit phase.

With the switches in the (AUT) position, whenever the level reaches the 1st pump start command (C31-C32), one of the pumps will be switched on alternately, only switching off when the level drops to the stop level (C21-C22). If the level rises to the simultaneous level (2nd pump start command C41-C42), both pumps will start operating simultaneously, only switching off both when the level drops to the stop level (C21-C22).

Opening the safety control (C11-C12) switches off the pumps, regardless of the indications of the start and stop controls and switches (if in automatic mode). If the safety control is not to be used, it must be closed using a shunt.

Whenever the alarm control (C51-C52) closes, the light alarm and the audible alarm will be turned on, and the latter can be turned off using the respective switch.

With the control circuit switch in position (I), the corresponding pump switches on, regardless of the status of the start, stop and safety controls.

The triggering of any of the thermal relays due to overload (red indicators) causes the corresponding pump to remain switched off regardless of the indications of any of the controls.

Technical Description