Grundfos Unilift AP50.50.08.1.V 96010595 [4/51] Function

Grundfos Unilift AP35.40.08.1.V 96001672 [4/51] Function
4
1. Installation and operation
Electrical connection, see section 8. Wiring diagram.
Adjustment of float switch, see installation and oper-
ating instructions for the pump.
2. General description
The control box consists of cables and a cabinet
containing various parts for control of the pump con-
nected.
* There are two types of cable: One for Unilift AP12,
AP35 and AP50 and another for Unilift AP35B og
AP50B.
3. Applications
The control box is designed for the protection and
start/stop of three-phase pumps, types:
Unilift AP12
Unilift AP35
Unilift AP50
Unilift AP35B
Unilift AP50B.
4. Function
The control box incorporates a three-phase contac-
tor with thermal relay. The contactor is cut in and out
by a float switch, and thus starts and stops the pump.
When the contact in the float switch is closed, the
contactor operates and the pump starts. See also
section 7. Functional sketch.
5. Push buttons
The control box has two push buttons, one for star-
ting the pump and one for stopping the pump/reset-
ting the thermal relay.
The buttons are marked:
5.1 Start/stop of pump
5.2 Resetting the thermal relay
If the thermal relay has tripped out, it can be reset by
briefly pressing the button "O".
Result:
6. Service
No service parts are available for the control box.
Before beginning installation procedures,
these installation and operating instruc-
tions should be studied carefully. The
installation and operation should be in
accordance with local regulations and
accepted codes of good practice.
TM03 0284 4704
Pos. Description
1 Mains cable
2 Indicator light, operation
3 Push button, start
4 Push button, stop/reset
5 Float switch
6 Motor cable *
7 Nameplate
34
6
5
1
2
7
Start
Stop/reset
Action
If the float
switch contact is
Press in the
button "I".
closed, the pumps starts.
open,
the pumps re-
mains stopped.
Briefly push
the button
"O".
closed, the pumps stops.
open, the pumps stops.
If the float switch
contact is
open,
the thermal relay is cut in,
but the pump remains
stopped.
closed,
the thermal relay is cut in,
and the pump starts.

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