TYCOPSU830 POWER SUPPLY AND BATTERY CHARGER

PRODUCT APPLICATION AND DESIGN INFORMATION

INTRODUCTION 

The PSU830 power supply is intended for use in MX/ZX/

ZXF/T2000/MX2 fire panels. It is a functional replacement for the PSB800, PSM800, PSB820 and PSB821. 

The PSU830 provides the following features: 

„ Power factor correction (PFC) to minimise loading 

effects on the AC supply and allows operation from 120 

- 240V ac. 

„ Temperature compensated, battery charger for sealed 

lead acid batteries: 

„ Battery disconnection (load shed) when operating from 

battery supply to provide deep discharge protection to 

battery set 

„ Fault monitoring includes:- 

– battery disconnected, battery wiring short, battery 

high resistance, battery voltage low, battery reverse, 

temperature compensation fault, ac supply low, 

internal charger fault 

„ Common fault output - volt free relay contacts 

„ Diagnostic LEDs for 

– AC ok 

– Battery fault 

– Charger fault 

– Ground (earth) fault 

„ Two 27VDC fused field supply outputs with short circuit 

protection, one output may be reset (turned off) under 

command from fire panel 

„ 40VDC 2.2.A output for supplying up to 4 fully loaded 

MX Digital loops, typically a single PSU830 may 

replace two PSB800 40V 1.2A supplies 

„ 5VDC output for use within fire panel/repeater 

„ Selectable Ground (earth) fault monitoring 

„ Battery charging function of two PSU830 may be connected in parallel 

TECHNICAL SPECIFICATION 

The PSU830 complies with the requirements of: 

„ EN 54-4/1997:A2-2006 Fire Detection and fire alarm 

systems; part 4, Power supply equipment 

SYSTEM COMPATIBILITY: 

„ Use only with MX/MX2/ZX/ ZXF/T2000 Fire Alarm 

Controllers 

ENVIRONMENT 

„ Indoor Application only, Land and Marine 

„ Operating Temperature: -10o

 to +55oC 

„ Storage Temperature: -20o to +70oC 

„ Operating Humidity: Up to 95% non-condensing 

NOTICE

Sealed lead acid batteries cannot be reliably 

charged when ambient air temperature 

around them (the battery ambient) exceeds 

50° C. 

DIMENSIONS (HWD): 

„ 62 x 132 x 242mm 

EMC 

„ The PSU830 complies with the following: 

„ Product family standard EN50130-4 in respect of Conducted Disturbances, Radiated Immunity, Electrostatic 

Discharge, Fast Transients and Slow High Energy 

„ EN 61000-6-3 for Emissions 

ELECTRICAL CHARACTERISTICS 

„ Input Voltage: 120-240Vac 50/60Hz (autoranging) 

„ Input Current Rated Load: 0.8-2.2ARMS

„ Rated input power: 200W maximum 

„ Outputs 

– Non-reset: 

27V dc @ 2A

5V dc @ 2.2A Rated, 3.0A max

40V dc @ 2.2 Rated, 2.3A max

– Reset: 27V dc @ 2A

„ +27V: 21-28.8Vdc (typically 27.3V with battery fully 

charged) 

„ +40V: 39.5-40.3Vdc 

„ +5V: 4.8-5.25Vdc 

„ Rated Output 

„ Rated output of 5A to supply the panel, fire system 

loads and charge 24V battery. De-rate to 4.5A when 

used at 120VAC and ambient above 40ºC, e.g. some 

T2000 Marine applications. 

„ Maximum Alarm current 5A for 30 minutes 

„ Maximum continuous load current (excluding charging) 2.5A 

„ Rated output power: 136W 

The PSU830 cannot support all outputs fully loaded, the 

following output load combinations are possible in MX 

panel application: 

BATTERY CHARGER

A PSU830 may be used to charge 17Ah or 38Ah battery 

sets. To meet the requirements of charge to 80% rated 

capacity within 24 hours with a 38Ah battery set it is recommended that 2A or greater be allocated for battery 

charging. Points to note:

„ Trickle charge determined by battery capacity, typically 

100mA at 27.3Vdc. 

„ Maximum charging voltage 28.8V, battery at -5ºC. 

„ Minimum charging voltage 21V, condition battery discharged. 

„ Deep discharge protection, battery disconnection voltage < 20V. 

The PSU830 is not recommended for use with batteries 

that have been deep discharged. 

Recommended temperature for charging battery -5 to+ 

40ºC measured in the battery housing with thermistor lead 

assembly within 2cms from battery. Sealed lead acid batteries cannot be reliably charged when ambient air temperature around them (the battery ambient) exceeds 50ºC. 

Two PSU830 may be connected in parallel (dual PSU configuration) to provide charger output of up to 10A. All other 

outputs remain separate, i.e. 2 x 5V, 4 x 27V, 2 x 40V and 

must not be connected together. To meet the requirements 

of charge to 80% rated capacity within 24 hours with a 

65Ah battery set it is recommended that 3.4A or greater 

be allocated for battery charging. 

BATTERY REQUIREMENTS 

17Ah or 38Ah single PSU830. 

38Ah dual PSU830. Do not charge 17Ah batteries with 

dual PSU830s.

„ Standby Current Consumption: 90mA @ 24V dc 

FAULT MONITORING AND RESPONSE 

FAULT CONDITIONS THRESHOLDS

„ Low AC, < 100VAC. 

„ Battery low <22VDC

„ Battery disconnect < 20VDC

„ Battery High Resistance: 

– Single PSU: 0.6Ω

– Dual PSU: 0.3Ω

This is the maximum resistance of the battery circuit including battery, wiring and connections to the charger. 

„ Earth (ground fault), operates on the 0V, 5V, 27V and 

40V rails. Sensitivity varies with rail with respect to 

earth 

– 40V and Loop SIG < 300kohm 

– 27V < 100 kohm 

– 0V and Loop RTN < 22kohm

Fault Response

Battery charging terminals 

shorted: Isolates output or ruptures fuse

Battery charger connected 

to 12V battery: Isolates output

Battery reverse connection: Ruptures fuse

Below final voltage

(Deep Discharge): Battery disconnected

FAULT RESPONSE TIMES 

EN54.4 requires all faults other than battery resistance to 

be detected and indicated within 15 minutes, for the 

PSU830 this time is less than 14 minutes. Battery resistance fault must be indicated within 4 hours, for the 

PSU830 this time is less than 70 minutes and less than 14 

minutes once a battery resistance fault has been detected. 

 FAULT RELAY 

The normal state of the fault relay contacts is closed, indicating no fault. Any faults detected will cause the fault relay 

contacts to open. When the PSU830 is not powered the 

state of the fault relay contacts is open. 

BATTERY LOW

Battery low is not indicated as a fault at the PSU830. This 

signal is monitored by the fire panel to indicate that the battery is partially charged.

27V OUTPUTS

Each 27V output is protected by a 2A fuse. To obtain current up to 5.0A use PTM800 and 12-way cable assembly 

from CON1. The PTM800 provides 27V at terminal TB2-

3, to this may be connected to an FB800 fuseboard.

DUAL PSU OPERATION 

Fault monitoring outputs are connected in parallel and cannot distinguish which PSU830 is faulty, the fault status 

LEDs on each PSU should be used. 

Fault Response

Battery charging terminals 

shorted: Isolates output or ruptures fuse

Battery charger connected 

to 12V battery: Isolates output

Battery reverse connection: Ruptures fuse

Below final voltage

(Deep Discharge): Battery disconnected

Indicator Colour Function 

Ground Fault 

(earth fault) 

YELLOW Normally OFF 

ON when dc leakage current 

detected between Chassis 

Ground and conductors of 

cables from panel including: 

MX Digital Loop SIG+ and 

SIG-; 

Remote Bus; 

+27V dc; 

0V (dc common) 

CGR/NTC 

fault 

YELLOW Normally OFF 

On when: 

 Charger not charging battery, 

 Thermistor faulty, 

 Thermistor lead broken. 

Battery fault YELLOW Normally OFF 

ON when: 

 Battery disconnected, 

 Battery wiring short, 

 Battery high resistance, 

 Battery below final voltage. 

AC OK GREEN ON when AC supply healthy.

OFF when AC removed or 

very low. 

T

INSTALLATION, GENERAL POINTS

„ For MX2, ZX4, ZX4BB panels the second (auxiliary) 

PSU830 is installed on top of the first (primary) 

PSU830. 

„ For MX4000 and MX4000BB, panels the auxiliary 

PSU830 is installed in the battery housing. The distance between the housings is constrained by the length 

of the interconnecting cables. The recommended 

installation is battery housing beneath fire panel.

„ Connection of primary and auxiliary AC power leads is 

via a distribution block supplied with kit 557.201.231. 

The external AC supply is connected to a socket which is 

mated with distribution block. 

„ If FB800 fuseboard is required it may be mounted on 

small chassis plate above the batteries or on top of auxiliary PSU830, if the latter then PTM800 must be 

mounted on the side of the PSU830. 

„ The PTM800 should be mounted on the top of the 

PSU830 for MX4000 and MX4000BB panels. For 

ZX4 and ZX4BB it can either be mounted on top or on 

the left hand side with restricted access. For MX2 it 

would be sited on the left hand side.

„ For the ZX4 and ZX4BB panels, nylon cable ties are 

required to attach the distribution block to the metal 

bracket inside the panel housing. 

„ Monitoring of the auxiliary PSU830 is provided by ribbon cable connected between both power supplies.

„ Battery capacity must not be less than 38Ah when dual 

PSU830 is used as there is possibility of overcharging 

with smaller capacity batteries.

CONFIGURATION 

HEADERS AND LINKS 

The PSU830 has three headers to which are fitted jumper 

links, these headers enable selection of the following: 

„ Earth (ground) fault monitoring, there can only be one 

Earth fault monitoring circuit active at the fire panel. 

„ Output CON3.2 +27V may be reset (turned off) under 

CIE control. 

„ Unit may be configured for single unit or dual unit operation, link selects between primary (master) and auxiliary (slave). There can only be one primary and one auxiliary connected together, no other combinations are 

permitted. PSU830 cannot be mixed with any other 

PSU. 

Refer to Table 3, 4 and Figs. 2, 3, 4 for details of terminal 

block CON3, header and wiring configurations.