Application

Switching units (fig. 1 ... 3) are designed to control actuators by switching relay contacts using signals of “SENS&rdquo system devices.  Each relay of switching unit can be programmed for triggering using single or multiple values of measured parameters of single or multiple sensors thus making possible creation of automatic control, blocking and signaling algorithm. Programming of switching units is made using MS-K-500-... signaling device or PC with “Configuration” program.

Design

Switching units have different number of relays, power supply voltage and housing design. Switching unit in plastic housing have explosion-proof modification in metal housing with “VZ” index (fig. 1 ... 3). List and technical specifications of switching units are shown in table 1, connection diagrams are shown in fig. 4 ... 7.

Connection diagrams

Technical parameters (table 1)

Modifications*

Parameter

БК-2Р

БК-220В-5Р

БК-12В-5Р

БК-24В-5Р

БК-220В-8Р

Number of relays

2

5

8

Power supply voltage, V

6...15 (SENS line)

~220 V+-10%,

50+-3 Hz

12...16 (20...28)

~220 V+-10%,

50+-3 Hz

Power consumption, W, not more

0.36

1

1.3 (2.4)

1.5

Current consumption with Upow = 9V, mA, not more

40

-

-

-

Load parameters of relay contacts

<250V, 6A

Housing material

 

BK-...

shock-proof polystyrene

BK-... -VZ

steel 09Mn2Si

aluminum alloy

Explosion protection marking

 

BK-...

-

BK-... -VZ1

1Ex db IIB T4 Gb

Ambient temperature range, °С

BK-...

-30... 50

5 ... 50

BK-... -VZ

-50 ... 60

Климатическое исполнение по ГОСТ 15150

BK-...

УЗ

УХЛ4 в диапазоне температур от 5 °С до +50 °С

BK-... -VZ

УХЛ1 в диапазоне температур от-50 °С до+60 °С

Water and dust ingress protection degree as per IEC 60529

BK-...

-

IP66

BK-... -VZ

IP66

Overall dimensions, mm

BK-...

70,4x90x17,5

132x97x57

165x97x57

BK-... -VZ

124x123x114

220x177x85

274x168x66

Average lifetime, years, not less

10

* including modification «VZ»

Designation

Designation of switching units:

BK-2R, BK-2R-VZ-A-B;

BK-12V-5R-C, BK-12V-5R-VZ-B, BK-24V-5R-V, VK-24V-5R-VZ-B, BK-220V-5R-V, BK-220V-5R-VZ-B;

BK-220V-8R-C, BK-220V-8R-VZ-B,

where:
A - housing, cover, parts of cable fittings are made of corrosion-resistant steel: no designation - made of steel 09G2S (Steel 20); SS - made of 12Cr18Ni10Ti steel.
Б - kitting of cable fittings with cable protective sheath mounting devices: no designation no mounting devices;  UKM10 / UKM12 / UKBK15 / UK16 - with corresponding mounting device.
C - availability of 35 mm DIN rail mounting clamp:  no designation - no clamps,  DIN - clamps available.