Vaisala PWD22/52 - Initial Settings and Parameters

Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 41
Below is a table of a control logic example of relay controls 1 and 2 and
3 when all the relay controls are driven by visibility limits.
Table 8 Control Logic of Relay Controls 1, 2, and 3
Relay States Corresponding Visibility Conditions
1 OFF 2 OFF 3 OFF When visibility is higher than all the
limits.
1 ON 2 OFF 3 OFF When visibility is lower than LIMIT 1
but higher than LIMIT 2 and LIMIT 3.
1 ON 2 ON 3 OFF When visibility is lower than LIMIT 1
and LIMIT 2 but higher than LIMIT 3.
1 ON 2 ON 3 ON When visibility is lower than all the
limits.
When the third relay control output is set to be driven by the hardware
status, it pulls whenever a hardware alarm is detected. For details, see
section System Configuration Commands on page 62.
X3-9
(X4-5)
X4-6
X4-7
DGND
Control 1
VB12V
Relay 1
Relay 2
Relay 3
wires: X3-9 or X4-5 PNK
X4-5 VIO
X4-6 GRY/PNK
X4-7 RED/BLU
X4-8
X4-5
PWC board
Cable
Box
1008-015
Figure 14 Relay Connection: PWD22/52 Supplies
Figure 14 above illustrates external relays connection when relay coils
are powered by PWD22/52. Voltage pin VB 12 V and relay controls 1, 2,
and 3 are wired by default.
NOTE
Do not load any of the relay control output pins by more than 35 mA or
any Ext Vb voltage output pin by more than 200 mA.