ZISR-18 type intrinsically safe redundant power supply

Key Features:

• two completely separated inlets, one outlet
• no "switching" effect when turning off one of the power sources
• wide range of output voltage and current configuration options,
• output of the power supply of the "ib" category, supplied with voltage of 42VAC to 250VAC,
• considerable resistance to mechanical damage, momentary voltage increases, output short circuit and overheating,
• LCD display informing about the current operating parameters of the power supply,
• relays confirming the drain activation and an RS-485 communication connector.

The design of the ZISR-18 power supplies is based on proven solutions used in the well-known and proven ZISD-15 power supply family. The ZISR-18 power supply housing houses two independent power blocks.
The power supply ensures correct operation when powered from any supply. When powered from both supplies, the power drawn is divided between both supply sources. Thanks to this, when the voltage drops on one of the supplies, the power supply smoothly switches to drawing power from the other supply source. The intrinsically safe supply can be equipped with one of the following power modules:

intrinsically safe voltage 12V, current output 0.85A, unlimited cable length*
intrinsically safe voltage 12V, current efficiency 1.45A, cable length max. 450m*
intrinsically safe voltage 12V, current efficiency 1.9A, cable length max. 145m*
intrinsically safe voltage 15V, current efficiency 0.85A, unlimited cable length*
intrinsically safe voltage 15V, current efficiency 1.45A, cable length max. 450m*
intrinsically safe voltage 15V, current efficiency 1.9A, cable length max. 145m*

* - applies to cables with a cross-section of up to 2 x 4mm2.
This solution provides a wide range of configuration options and thus adapts the device to specific applications. An example application is powering devices that require sustained operation, e.g. by powering from two independent sources. Great emphasis has been placed on maximizing resistance to damage, both mechanical and from the power supply network. The power supply works correctly at voltages in the range of 42÷250 VAC. Additionally, it is resistant to momentary voltage increases occurring, e.g. when switching off the main receivers. Each power supply module has thermal and short-circuit protection. The power supplies are available in two versions: with a communication module and without a communication module. The version with a communication module has:

• relay outputs confirming correct operation of the drain,
• RS-485 serial communication connector enabling data transfer for visualization,
• LCD display showing the outgoing voltage and current, the mains voltage on each side of the inflow and the current time,
• two two-colour LEDs located on the front panel, indicating the operating status (green – correct operation, red – overload/fault).

Technical data of ZISR-18
Parameter name	Value (unit)
Rated supply voltage	42V - 250VAC + 0% -5%,
Supply voltage frequency	50-60Hz
Maximum power	100W
Maximum current	3.5A
Total input current typically [A] Uwy = 15V (sum of A and B supply current) Double-sided power supply	Iwy[A] Uin [Vac]	0.85A	1.45A	1.90A
	42Vac	0.71A	1.03A	1.33A
	133Vac	0.25A	0.37A	0.46A
	230Vac	0.18A	0.25A	0.30A
Total input power typical [W] Uwy = 15V (sum of power supply A and B) Double-sided power supply	Iwy[A] Uin[Vac]	0.85A	1.45A	1.90A
	42Vac	22W	32W	46W
	133Vac	20W	30W	40W
	230Vac	24W	33W	40W
Single Input Current (Second Input Disconnected) Single-sided power supply Uout=15V	Iwy[A] Uin [Vac]	0.85A	1.45A	1.90A
	42Vac	0.60A	0.99A	1.34A
	133Vac	0.23A	0.35A	0.45A
	230Vac	0.16A	0.23A	0.28A
Input power of single supply (second supply disconnected) Single-sided power supply Uout=15V	Iwy[A] Uin [Vac]	0.85A	1.45A	1.90A
	42Vac	20W	34W	47W
	133Vac	18W	29W	38W
	230Vac	20W	30W	38W
ATEX marking	I M2 Ex db mb [ib] I Mb
EC type examination certificate number	JSHP 18 ATEX 0025X
Power supply start time typ.	<4s.
Flameproof cable entry	WKE 17-23
Output voltage and current stabilization speed (for worst condition: ΔI=1.45A & ΔU=15V)	type 6.5ms.
Maximum cross-section of conductors for flameproof junction chamber	10mm 2
Maximum cross-section of intrinsically safe output cables	4mm 2
Ambient temperature range	-20°C to 40°C
Permissible humidity (at 40°C)	95%
Degree of protection	IP65
Mass	22kg - 25kg
External dimensions	According to attachments