The following information need only be noted in the case of special settings and problems with the
soft start.
All ’variomat 2’ pressure-maintaining systems are fitted with a soft start and stop facility for the pump as
standard. The starting and stopping times and the motor start moments can be set using the potentiometers
(1-6) on the circuit board in the control box. By default, the starting (t
up
) and stopping (t
down
) times are set to
approx. 3 seconds. You should not change these settings. The default settings of the potentiometers are
indicated by a dot. The operating power for the pump is only passed through the soft start during the starting or
stopping times. After that, the power is switched over to the main relay. This is indicated by the LEDs 7 and 8.
The soft start for the ’variomat 1 and 2-1’ is only equipped for one pump (motor 1).
If the soft start board is defective it can be removed and the motors can be switched directly using the relay on
the I/O base board. Two additional jumpers must be present for this to be possible. If the “contact water meter”
function is not used, the corresponding jumpers on terminal strip J2 can be used.
Caution:
If the soft start fails, the pump must be checked for stiffness, blocking, or other failures.
– For ’variomat 2-1’ remove three cables and for ’variomat 2-2’ five cables with flat plugs leading to the soft
start from the I/O base board.
– Remove the 10-pin plug of the flat cable.
– Release the two fastening clips that lock the cover of the soft start board into place and remove the
cover plate.
– Unscrew the four M4 plastic nuts and remove the soft start board. The plastic spacers can remain on the
base board.
– On the I/O base board, 2 jumpers must be placed on the pin strip X4 SOFT-START at the positions 1-2
and 3-4.
– Close the control box door once all the connections have been established.
– Tighten the 2 screws on the control box door.
– Establish the power supply.
– The system version appears in the display of the controller.
The ’variomat’ controller is now
ready for initial start-up.
I/O circuit board
Cover plate of the soft start board
1
2
3
7
8
4
5
6
reflex ’variomat’
Initial start-up
15
Soft start
Designation
Terminal
Signal
Remarks
Motorised ball
valve 1
25
0 - 10 V
Manipulated variable
26
0 - 10 V
Feedback
27
GND
28
+24 V
Supply
RS-485
In the case of ’variomat 1’, the interface is provided for updating the program only.
interface
With ’variomat 1’, the external fuse must not exceed A.
