VDH ALFA 802, ALFANET 802 User Manual

1

User manual

ALFA 802 and ALFANET 802

Off-delay Timer-unit

VDH doc. 060350 Version: v1.1 Date: 26-05-2008

Software: ALFA 802 Flash File: Do060350.wpd Range: 0-999

* Operation.

The ALFA(NET) 802 is a panel mounting timer-unit, with a off-delay relay function. The off-delay time
is set by the keys on the front panel. The timer-unit has a range from 0-999 minutes, seconds or hours
(P01). The timer-unit has also a contact-input for starting, stopping or waiting the unit (P02).
The ALFANET 802 is provided with a RS 485 network connection, to readout or set the unit on the
PC with ALFANET software. by using a ALFANET PC-Interface.

* Installation.

On the topside of the ALFA(NET) 802 can be read how to connect this unit, such as powersupply,
relay-output, contact input and network.
After power up the ALFA(NET) 802 and the self test is finished the unit displays the off-delay time.
As the output relay is activated the LED 'on' in the display lits to indicate this.

* Control.

The ALFA(NET) 802 Timer-unit can by controlled by three pushbuttons on the front. These keys are:

[] SET - view / change setting.
[] UP - increase setting.
[] DOWN - decrease setting.

* Changing current off-delay time.

Push the SET key, the LED ‘set’ starts blinking. Release the SET key. Now push the SET key again
and together with the UP or DOWN keys the current off-delay time can by changed. A few seconds
after releasing the keys the timer-unit returns to it’s normal operation, the LED ‘set’ switches off.

* Start, Stop and Wait function of the off-delay timer.

Push the UP key to start the timer, the LED ‘on’ lits and the relay will be activated. During the off-delay
time the timer unit can be set in a waiting mode by pressing the DOWN key. During this waiting mode
the relay will deactivate as P03=0 or stays active as P03=1. During the waiting mode the LED ‘on’ is
blinking and the remaining time is on hold. To continue the off-delay timer, push the UP key again.
As in the other hand the DOWN key is pressed again (second time), than the off-delay ti mer is
stopped, the display shows for 5 seconds ‘000' and the LED ‘on’ goes off. The timer stops completely
and after 5 seconds the display shows the set off-delay time again in the display. So the unit is ready
for the next start.

2

* Setting internal parameters.

By pushing the DOWN key for more then 10 seconds, you enter the ‘internal programming menu’.
In the left display the upper and lower segments are blinking. W ith the UP and DOWN keys the
required parameter can be selected (see parameter table).
If the required parameter is selected, the value can by read-out by pushing the SET key. By pus hing
simultaneously the SET key and the UP or DOWN key the parameter value can be changed.
If no key is pushed for 20 seconds, the ALFA(NET) 802 will return to it’s normal operation and the
changes are saved.

* Parameters ALFA 802.

Para­meter

Description Parameter Range Default

value

01 Unit of time

0 = minutes
1 = seconds
2 = hours

0...2 0

02 Contact-input mode

0 = Not active
1 = Start only at closing the input (puls contact)
2 = Stop only at closing the input (puls contact)
3 = Start/Wait at closing the input (puls contact)
4 = Stop/Stop at closing the input (puls contact)
5 = Wait as long as input conct is closed

0...5 0

03 Waiting mode

0 = Relay de-actives during waiting
1 =Relay stays active during waiting

0...1 0

04 Display mode

0 = Display shows set off-delay time as the time is not

active

1 = Display extinguishes as the timer is not active

2 = Display stays on ‘000' as the off-timer has run out.
Restart only possible as the power supply has been taken
interrupted

0...2 0

05 Down-key mode:

0 = Pushing the Down-key during running the timer the
timer is set in the waiting mode (Pushing the Down-key for the
second time the timer will reset)

1 = Pushing the Down-key the timer unit will reset directly

0...1 0

06 Up-key mode:

0 = Start timer with Up-key possible

1 = Start timer with Up-key not possible

0...1 0

10 Auto reset relay after end off time

0 = No auto reset

0..99 sec 0

90
95
96
97
98
99

Network number (only at ALFANET 802)
Software version
Production year
Production week
Serial number (x 1000)
Serial number (units)

1...250

-

00...99

1...52

0...250

0...999

1

-

-

-

-

-

Remark: In case that the timer-unit is set on minutes (P01= 0), the display shows the last minute

of the current rest time in seconds. To indicate this, the lower segment of the first digit is
lit and the other digits show the time in seconds.