SSU-24ExEi-ZS power supply and signal transmission module
The purpose of the SSU-24ExEi-ZS is to:
- galvanic separation of self-safe (sound-signaling) from non-self-safe circuits (Fire Alarm Central and siren activation output)
- limitation of voltage and current in circuits inside the spaces threatened by the explosive atmosphere of gases, vapors and dusts (Ex space)
- functional compatibility with fire alarm equipment outside Ex space
Explosion-proof protection of the enclosed space with the 800Exi system was achieved if and only if an SSU-24ExEi-ZS device was used between the Ex-space signaling device and other equipment, and if all the equipment of the 800Exi system was properly designed, installed, used and maintained.
The SSU-24ExEi-ZS consists of several essential parts:
- galvanically separated power supply, DC / DC converter with current and voltage limitation
- Fire Alarm central signal transmitter assembly for actuator signaling in Ex space with galvanic separation by opto-isolators and with current and voltage limitation
- circuit for limiting current and voltage supply obtained from a central fire alarm (Fire Alarm Central) device.
- signaling of operation of DC / DC converter two green LE diodes for signaling the power supply of the device and signaling device
- channel status signaling for each channel separately (L1, L2)
L1 and L2 LED red, channels L1 and L2 activated
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Number of signaliser (channels) (L1 and L2) |
2 chanel |
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Number of signaliser per channel |
1 signaliser |
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Parallel connection |
FORBIDDEN |
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Supply voltage |
U = 20 - 28, 8V |
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Maximum output voltage on line L1 and L2 |
U = 16,8 V |
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Maximum short circuit current L1 and L2 |
I = 100 mA |
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Maximum capacity of line L1 or L2 |
(IIC) Co = 390 nF, (IIIC) Co = 2,26 μF |
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Maximum permissible inductance of line L1 or L2 |
(IIC) Lo= 3,6 mH, (IIIC) Lo = 14 mH |
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Maximum output power per L1 or L2 |
Po = 0,63 W |
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Maximum allowable Lo and Ro ratio by L1 or L2 |
(IIC) Lo/Ro = 57 μH/Ω |
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Device body dimensions (L x W x H) |
197 x 150 x 75 mm |
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Color |
Gray RAL9018 |
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Fuses: F1 (Littelfuse typ201 or 217; ESKA No.521.000) F111, 211 (0.08A MT / 250V ESKA No.887.006.) |
0,125 A M / 250 V
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Maximum voltage of the device power supply error |
Um = 253 V |
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Weight |
650 g. |
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Ambient temperature |
Tamb = -20⁰ C do +55⁰ C |
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Standby power consumption at L1 and L2 |
With U = 24 V DC, I = 80 mA |
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Water and dust protection |
IP 54 |
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Type of protection for gases and vapors: Industry (above ground), Zone 1 and 2, intrinsic safety, group of gases IIC (hydrogen, acetylene), installation outside the enclosed space |
Ex II (2)G [Ex ib Gb] IIC |
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Dust protection type: Industry (aboveground), Zone 21 and 22, intrinsic safety, conductive dust IIIC (ρ ≤ 10kΩm) installation outside the enclosed space |
Ex II (2)D [Ex ib Db] IIIC
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