16
Automated VPA
Differential pressure sensor
Characteristic
Operating pressure range:
500 - 500 kPa
Max. operating pressure:
5.0 kPa within the entire range
Temperature range:
0 °C to + 85 °C
Electric load:
max. 1.5 A (0.4 A / 250 V AC
Electric protection:
IP 54 with protective cover
Differential pressure sensor is supplied previously installed on
VPA
case.
To avoid the unforeseen situation, make sure that the rubber tube before the filter (in the
flow direction) is connected to sensor output P1 and the tube after the filter — to output P2.
Default setting corresponds to sensor operation at pressure drop of 200 kPa.
Control unit
Control unit is produced in several versions: for single-phase electric network 230 V/50
Hz fig. 7) and three-phase electric network 400 V / 50 Hz (fig. 8). In figures there are pre-
sented the tables showing all possible connections to the control unit. Not all terminals
may be used in particular version.
Connection of all circuits is executed using two terminal blocks installed on the con-
trol unit (see fig. 7 and 8). Fan, heater, heater control opto-triac unit, control unit, chan-
nel temperature sensor and differential pressure sensor are connected originally by the
manufacturer. There are envisaged the additional options of external device connections:
contact of automatic fire extinguishing system and contact of humidity relay — hygrostat.
To connect the contact of automatic fire extinguishing system it is necessary to remove the
jumper installed between the terminals X1:17 and X1:18 in terminal block X1; in this case
there is used normally closed «dry contact» which in the event of fire opens, at central fire
extinguishing board, the VPA control circuit and de-energizes it. Hygrostat is connected to
terminals X1:19 and X1:20 in terminal block X1; there is used normally open «dry contact»,
and in the event of its closing VPA is switched to maximum speed mode. Connection of
additional contacts is provided by the consumer. The external view of terminal block X1
and the contacts for external connections are shown in fig. 9.
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