Grundfos EPC 300, Installation And Operating Instructions Manual

Page: 8 / 180

English (GB)
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5. Functions
5.1 Operating functions
Automatic operation
When the pump set is in automatic mode, only the green
"Power supply" indicator light is on. All other alarm and status
indicator lights should be off.
As soon as the sprinklers are activated and water is consumed,
the pressure in the discharge pipe is reduced. If the pressure falls
below the cut-in pressure set on the pressure switch, the pump
will start automatically. The "Pump running" indicator light will
light up, and the AR3 output relay will be activated. Furthermore,
the "Pump on demand" indicator light will light up, and the AR2
output relay will be activated.
If the pump set cannot start due to a fault, the yellow "Failure to
start" indicator light will light up, and the AR5 digital output will be
activated. The alarm indication will be reset automatically, when
the fault has disappeared.
It is only possible to stop the pump manually by setting the
selector switch to "Test" and pressing [Stop].
For safety reasons, a redundant pressure switch should always
be connected in addition to the primary pressure switch.
See also section
12.1 Automatic operation .
Manual operation
During start-up and for test purposes, the pump can be started
manually by turning the selector switch to "Test" and pressing
[Start]. When [Start] is pressed, the start relay is activated by
bypassing the pressure switch in the discharge line. The red
"Pump running" indicator light will light up, and the AR3 output
relay will be activated. In manual mode, the "Pump on demand"
indicator light does not light up, and the AR2 output relay will be
deactivated.
You can only switch off the pump manually by pressing [Stop].
To restore automatic mode, the selector switch must be turned
back to "Auto".
See also section
12.2 Manual operation .
Pressure switch test
The pressure switch function can be tested by means of [P1] and
[P2]. To do this, set the selector switch to "Test". During the
testing procedure, the corresponding indicator light will light up
alongside the respective button. See also section
12.3 Test run .
Indicator light test
It is possible to carry out an indicator light test. To test the
function of the indicator lights of the control panel, press
.
See also section 14. Maintenance .
5.2 Monitoring functions
Controller voltage supply
The connection of the controller to the mains is monitored in
order to determine whether the phase sequence is correct. If it is,
the "Power supply" indicator light is on, and the AR1 output relay
is activated.
Pump start request
If, in automatic mode, there is a start request from either a
pressure switch (DI1 or DI2 open) or the level switch switch in the
priming tank (DI3 closed), the "Pump on demand" indicator light
will light up, and the AR2 output relay will be activated. In manual
mode, the "Pump on demand" indicator light does not light up,
and the AR2 output relay remains deactivated.
Pump operation
It is possible to monitor whether the pump is running via an
additional pressure switch built into the discharge line. If the start
relay for the motor is activated and the contact in the DI4 digital
input is closed, the "Pump running" indicator light will light up, and
the AR3 output relay will be activated.
If there is no signal from the pressure switch to the DI4 digital
input on the pressure side, although the start relay has been
activated by the motor, the "Failure to start" indicator light will
light up, and the AR5 output relay will be activated.
Power supply to the motor
The power supply to the motor is monitored by means of a phase
monitoring relay. If there is a voltage failure on the motor
terminals when the start relay is activated, the "Power failure"
indicator light will light up, and the AR4 output relay will be
activated.
6. Product identification
6.1 Nameplate
The controller can be identified by means of the nameplate.
The nameplate of the controller is attached externally on the right
side and internally on the cabinet door.
Fig. 3 Nameplate
Note
Automatic operation is the normal operating
mode. For this mode, the selector switch must be
set to "Auto".
T
M
05
07
58
15
10
Pos. Description
1 CE mark
2 Manufacturer
3 Production date
4 Product number
5 Serial number
6 Type designation
7 Rated voltage
8 Nominal frequency
9 Max. current
10 Rated short-circuit current
11 Protection class