2 start/stop of pump, 3 priming/venting of pump, 4 level control – Burkert Type 7800 User Manual
Page 9: 5 indicator lights and alarm output
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4.2 Start/stop of pump
The pump can be started/stopped in two different
ways:
• Locally on the pump control panel.
• By means of an external on/off switch connected
to the pulse input. See connection overview in
section 3.6.
4.3 Priming/venting of pump
The pump control panel incorporates a
button.
Press this button if the maximum pump capacity is
required over a short period, e.g. during start-up.
When the button is released, the pump automatically
returns to the previous operating mode.
During priming/venting, it is recommended to let the
pump run without a counter pressure or to loosen the
vent valve by giving it a 1/8 to 1/4 turn.
Note: When the buttons
and
are pressed si-
multaneously, the pump can be set to run for a spe-
cific number of seconds at maximum capacity. The
remaining number of seconds will appear in the dis-
play. The maximum value is 300 seconds.
4.4 Level control
The pump can be fitted with a level control unit for
monitoring of the chemical level in the tank.
The pump can react to two level signals. The pump
will react differently, depending on the influence on
the individual level sensors.
* Control variant “AR” only.
See section 3.6 for connection of the level control
unit and alarm output.
4.5 Indicator lights and alarm output
The green and red indicator lights on the pump are
used for operating and fault indication.
In control variant “AR”, the pump can activate an ex-
ternal alarm signal by means of a built-in alarm relay.
The alarm signal is activated by means of an internal
potential-free contact.
The functions of the indicator lights and the built-in
alarm relay appear from the table below:
1
Control variant AR only.
2
Requires connection to level sensors.
3
Requires activation of the dosing monitoring
function and connection to a dosing monitor.
Level sensors
Pump reaction
Upper sensor
activated
(closed contact)
• Red indicator light is on.
• Pump running.
• Alarm relay activated.*
Lower sensor
activated
(closed contact)
• Red indicator light is on.
• Pump stopped.
• Alarm relay activated.*
100%
100%
Condition
Green
LED
Red
LED
Dis-
play
Alarm
output
1
Pump
running
On
Off
Normal
indication
Set to stop
Flash-
ing
Off
Normal
indication
Pump fault
Off
On
EEPROM
Supply
failure
Off
Off
Off
Pump run-
ning, low
chemical
level
2
On
On
Normal
indication
Empty
tank
2
Off
On
Normal
indication
Analog
signal
< 2 mA
Off
On
Normal
indication
The dosed
quantity is
too small
according
to the sig-
nal from the
dosing
monitor
3
On
On
Normal
indication
Overheat-
ing
Off
On
MAX.
TEMP.
1
3
2
NC NO C
1
3
2
NC NO C
1 2
3
NC NO C
1
3
2
NC NO C
1 2
3
NC NO C
1 2
3
NC NO C
1 2
3
NC NO C
1 2
3
NC NO C
1 2
3
NC NO C