ACCESS-PSU2-8A Switch Mode Power Supply Unit
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Product Information
Specifications
- Models: ACCESS-PSU2-8A, MULTI-ACCESS-PSU2, PSU4, PSU6
- Input Rated Voltage/Operational Voltage: 13.8Vdc 8A/27.6Vdc
4A - Fused Outputs: Selectable Voltage PSU
- Features: Universal back plate for mounting Access Control
Devices
Product Usage Instructions
1. Safety Information
When using mains equipment, always observe local regulations for
safety.
2. Installation and Commissioning
Mounting: Mount the device on walls, ceilings,
or other surfaces using 5mm diameter steel screws with suitable
thread size and length (refer to Figures 2 and 3 for mounting
requirements).
3. AC Power Up (Commissioning)
Connect the device to AC power supply and ensure the standby
battery is connected. The Red fault LED may flash if no battery is
connected; this is normal. Allow time for the battery to
charge.
4. Standby Battery
Connect the standby battery as shown in Figure 4. Set the tamper
setting as illustrated in Figure 5.
5. Universal Backplate
The device’s hole pattern allows mounting Lenel controllers in
various positions. Use the provided kit with standoffs and screws
for mounting. Follow the recommended steps for fitting standoffs or
using screws as described in Figures 6a and 6b.
6. Connections
Ensure the output voltage selector switch is in the correct
position before making any connections. Refer to product
documentation for details on coil operation and signaling
outputs.
FAQ
1. What should I do if the Red fault LED flashes?
If the Red fault LED flashes, check if the standby battery is
connected. Connect the battery and allow it to charge; the flashing
is normal during this process.
2. How do I mount Lenel controllers using the Universal
backplate?
For mounting Lenel controllers, use the provided standoffs and
screws. Follow the recommended steps for fitting standoffs or using
screws as described in the product manual.
3. What is the purpose of the output voltage selector
switch?
The output voltage selector switch allows you to choose between
different output voltages based on your requirements. Ensure it is
set correctly before making any connections.
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Elmdene International Ltd
3 Keel Close, Interchange Park Portsmouth, Hampshire, PO3 5QD, UK
Tel:+44 (0)23 9269 6638
Fax: +44 (0)23 9266 0483 Web: www.elmdene.co.uk
Models: ACCESS-PSU2-8A MULTI-ACCESS-PSU2, PSU4 and PSU6
13.8Vdc 8A/27.6Vdc 4A Selectable Voltage PSU With UNIVERSAL back plate for mounting Access Control Devices
The ACCESS-PSU2-8A and MULTI-ACCESS-PSUx are an advanced, high efficiency power supply range, designed for use within Access Control applications. Featuring a selectable, regulated output of 13.8Vdc or 27.6Vdc, supplying continuous full rated current to load plus an additional 0.5A for charging one or two 12V standby batteries. Mains fail monitoring is offered as standard in conjunction with an onboard ancillary relay that can be used as a Fire relay if required. The `Universal’ mesh backplate and hinged plates, provide the installer simple & flexible mounting options for a range of devices/PCB’s
1. FEATURES
· Continuous full rated current to load · Universal mains input voltage 90-264Vac · Selectable output voltage (12Vdc or 24Vdc) with onboard selector switch (Default:
12Vdc)
· Lockable steel enclosure · 17Ah Standby battery recharged to 80% within 24 hours · MULTI-ACCESS: Two hinged mounting panels to accommodate multiple devices · Volt free contact, signalling mains failure (EPS) · Independent ancillary relay available for power/lock release · MULTI-ACCESS: 8 x fused outputs with health LED’s · High efficiency electronics for reduced running costs and lower operating
temperatures
· Installer safe design with all high voltage electronics fully shrouded · Modular construction for ease of maintenance and installation · Green mains presents / yellow fault LEDs · Reverse battery connection protection · Lid and removal from wall tamper detection · LED status indication (Mains & Fault) · Full electronic short circuit & overload protection · Individual battery and output fuse protection · Mains transient protection circuit · Accommodates either 2 x 12V 7Ah or 1 x 17Ah SLA battery · Limited Lifetime Warranty
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
2. SAFETY INFORMATION
Mains equipment, observe local regulations.
3. INSTALLATION AND COMMISSIONING
Installation and repair must be carried out by a certified professional or qualified electrician in accordance with all relevant safety regulations that are applicable. This unit is only suitable for installation as permanently connected equipment and is to be used with DC appliances only. This equipment is NOT SUITABLE for external installation and must be installed according to all relevant safety regulations. The unit must be fed from an AC power source having a separate (approved) disconnect device and fitted with a fuse or other over-current protection device rated at 3A maximum. Ensure that the disconnect device used has appropriate earth fault protection to the applicable standard.
3.1. Door opening / closing Door locking is provided by a Camlock key on either one or two positions on the front right-hand side of the enclosure Figure 1
Figure 1: Key lock
3.2.
Mounting
· Mount enclosure securely in correct orientation allowing minimum clearance of 10cm
from walls, ceilings or other obstacles and using 5mm diameter steel screws having a
thread size and length suitable for the wall type or the surface being mounted on
(Figures 2 and 3).
· Route power and LV cables via different knockouts / cable entry holes.
· Use bushes and cable glands rated to UL94 HB minimum.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
Figure 2: Mounting and clearances (Diagram shows MUTLIACCESS-PSU6, mounting requirements apply for all types)
ACCESS-PSU2-8A
MULTI-ACCESS-PSUx
Figure 3 Enclosure fixing points
3.3. AC Power Up (commissioning)
· Attach correctly rated AC power cable (minimum 0.5mm2 [3A], 300/500V ac) and fasten using cable ties.
· Apply AC power. Check for 13.8Vdc/27.6Vdc on load output and AC power LED is on. · Disconnect AC power.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
3.4. Load Output (commissioning) · Ensure Voltage selector switch is set to the correct voltage before applying load or
connecting battery.
· Attach correctly rated load cable and fasten using cable ties. Note polarity. · Apply mains power and check AC power LED is ON, verify load is operating correctly.
5. N.B. – The Red fault LED may flash to indicate no battery is connected; this is
normal.
· Disconnect mains power. · Connect EPS fault output to appropriate input of CIE equipment.
· Attach supplied battery cables to the correct PSU terminals and battery. N.B. For 24Vdc output operation ensure two 12Vdc batteries are connected in series with batteries connected correctly: Red lead to +ve of battery 1, Black lead to ve of battery 2., connect -ve of battery 1 to +ve of battery 2 using short link lead provided.
· Connect tamper switch to appropriate input of CIE equipment. · Close the lid and fasten with keylock · Reconnect AC power. · Check there is no fault indication on the Fault LED. A single short flash indicates the
battery is charging, please note, this is normal operation.
· Disconnect AC power. Check that the battery continues to supply voltage and current to the load.
· Reconnect AC power.
3.5. Standby battery
· Ensure a single 12V battery is used for 12V operation, and two 12V batteries in series for 24V.
· Attach supplied battery cables to terminal block and batteries. NOTE: If in 24V mode, ensure correct polarity of battery connections: Red lead to +ve of battery 1, Black lead to -ve of battery 2. Connect -ve of battery 1 to +ve of battery 2 using short link lead as shown in Figure 4.
· Position batteries to avoid lid fixing screw. · Apply mains power. Check Green Mains LED is ON. · Check there is no fault indication on Yellow Fault LED. · Disconnect mains power. Check that the batteries continue to supply the load. Check
Green Mains LED is OFF and Mains Fail relay operated. NOTE: Batteries must have sufficient charge to supply the load · Reconnect mains power. Check Green Mains LED is ON and Mains Fail relay showing healthy. · Remove Output fuse (F3) and check Yellow Fault LED is ON. · Replace Output fuse and remove PSU protection fuse (F2). Check Yellow Fault LED is ON. · Replace PSU protection fuse (F2). Check Yellow Fault LED is OFF.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
· Test operation of Ancillary Relay (if used)
Figure 4: Battery connection
3.6. Tamper (commissioning) (Figure 5) · Check that the CIE recognises the tamper is `OPEN’. · Close the lid and fasten with keylocks. · With the unit mounted on the wall check that the rear tamper is not in a position that
will affect its operation, for example over a mortar course, recess or raised area on the wall. Check that the tamper switch is: CLOSED when the lid/cover is closed and the retaining screws are fitted, OPEN when the retaining screws are removed, and the lid/cover is open. Use fine adjustment screw if necessary to align indicator with set point. · Close the lid/cover and fasten. Re-check tamper circuit is closed at the control panel.
Figure 5: Tamper setting
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
3.7. Universal Backplate
The hole pattern in the enclosures allows a wide variety of Lenel controllers to be mounted in any position. A kit is included that comprises of standoffs and self-tapping screws for this purpose.
For PCB type devices, use the nylon arrowhead type standoffs supplied in the fixing kit.
It is recommended that the standoffs are fitted as described below:
1) Fit the standoffs into the PCB mounting holes. 2) Gently place the device in the required position,
locating/aligning the standoffs on the Universal mesh but without pressing in place. 3) Once positioning is correct, push standoffs into the selected hole positions, ensuring each one has locked in place (Figure 6a)
Figure 6a: Standoff fitting
For devices that need to be fixed by screws, use the 3.5mm (No.6) self-tapping screws that are supplied in the fixing kit.
It is recommended that the devices are fitted as described below:
1) Align the device over the mesh, so that the required number of mounting holes are aligned as close as possible with the mesh hole pattern.
2) Loosely fix the screws in each of the aligned mounting positions.
3) Once position is correct, tighten all screws (max torque 0.6Nm) (Figure 6b)
Figure 6b: Screw fixing
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
3.8. Connections Ensure output voltage selector switch is in correct position prior to connections.
TAMPER
Front & Rear Enclosure Tamper signal Normally Closed when Healthy.
ANCILLARY RELAY 12 24V
Coil operated by either: 0V/12Vdc or 0V/24Vdc COM, NO, NC contacts available. Output Voltage selection via sliding switch
3.9. Signalling outputs
Contact Rating
0.5A @ 30Vdc, Volt-free.
MAINS FAIL
Open if Loss of AC power for > 10s
TAMPER
0.5 A @ 30Vdc volt-free contact. Open if lid is opened, or if unit is prised from the wall.
3.10. LED Indicators
Mains LED (GREEN) Mains Present
FAULT LED (YELLOW) Output fuse fail, or Protection fuse fail (requires load and battery to be connected), battery shorted, reversed.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
4. OPERATION AND MONITORING OVERVIEW
Once installed and commissioned no further involvement is required for normal operation. Under normal conditions with AC mains applied, the power supply will provide a continuous load current of up to 8A/4A via the 8-way Fused Output Module. Should a fault occur, the relevant fault signal will be activated, and the diagnostic LEDs will provide additional information regarding the type of fault detected. The unit will continue normal operation once the fault has been rectified. Should a loss of mains occur, the unit will flag a fault and seamlessly switch to the standby battery for power. Should the battery become depleted before mains power is re-applied it will disconnect and all power to the load will be dropped. Once mains power has been restored, power to the load from the power supply will automatically be provided and the standby battery will start to be recharged as required. For monitoring, a single independent output signal is provided to indicate loss of AC power (MAINS FAIL).
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
5. SPECIFICATION
Input Rated Voltage/Operational Voltage Max. AC power Input Current (at
90Vac)
Mains input fuse (20mm 250Vac HRC) Max standby power Output Voltage mains power Voltage battery standby Output Load Current (Max)
Fused outputs
Load output fuse Ripple
Overload
Standby Battery Battery Type Battery Capacity (max) Battery Fuse Protection
100-240Vac / 90-264Vac (at 50-60Hz)
< 2.0A @ 90V ac
T3.15A (HRC 20mm) 1.5W (no load and no battery connected)
12V Mode
24V Mode
13.5V-14.0Vdc (13.8Vdc nominal)
27.0V-28.0Vdc (27.6Vdc nominal)
10.5V-12.4Vdc
21.0V-24.7Vdc
8A
4A
ACCESS-PSU2-8A: 4 x F2.0A
MULTI-AXIS-PSUx: 8 x F1.0 A (default). Spare fuses provided for 24V mode (8 x F500mA)
8A (F3)
4A (F2)
< 100mVdc pkpk max
Electronic shutdown (mains operation) and fuse protection. Battery protection by self-resetting thermal fuse.
12V Valve Regulated Lead Acid (1 or 2) 1 x 12V 17Ah (12V) or 2 x 12V 7Ah (24V)* 0.5A PTC thermal fuse (self-resetting)
Environmental Temperature – Operating Temperature – Storage Mechanical Dimensions (W x H x D) mm
Weight (Kg) without battery
IP and IK ratings
-10°C to +40°C 90% RH non-Condensing -20°C to +80°C
ACCESS-PSU2-8A: 408 x 508 x 90 MULTI-ACCESS-PSUx: 479 x 515 x 146 ACCESS-PSU2-8A: 6.2 MULTI-ACCESS- PSU2: 8.1 MULTI-ACCESS- PSU4: 8.9 MULTI-ACCESS- PSU6: 9.7 IP30 / IK08
· For 24V applications only. Ensure voltage selector is set to 24V when connecting two batteries.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
6. MAINTENANCE
This unit is intended for use by Service Personnel only. There are NO USER SERVICEABLE parts, and no regular is maintenance required of the PSE other than periodic testing and replacement of the standby battery.
7. COMPLIANCE
This power supply unit meets the essential requirements of the following European Directives:
Low Voltage 2014/35/EU
EMC 2014/30/EU
WEEE 2012/19/EU
RoHS 2011/65/EU
8. END OF LIFE DISPOSAL
This product falls within the scope of EU Directives 2012/19/EU Waste Electrical and Electronic Equipment (WEEE) and 2013/56/EU (Battery). At the end of life, the product must be separated from the domestic waste stream and disposed via an appropriate approved WEEE disposal route in accordance with all national and local regulations.
Before disposal of the product, any battery must be removed and disposed of separately via an appropriate approved battery disposal route in accordance with all national and local regulations. Package used batteries safely for onward transport to your supplier, collection point or disposal facility. See Specification for battery type information.
For more information see: www.recyclethis.info
Warning: risk of explosion if incorrect battery type fitted.
The packaging supplied with this product may be recycled. Please dispose of packaging accordingly.
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
9. SYMBOL DEFINITIONS
Explanation of symbols: (Not all may apply)
Fault Indication
Shock Risk isolate before attempting access
Mains Present
Protective Earth
Do not dispose of in unsorted waste
Specifications subject to change without notice
Technical Support: +44(0)23 9269 6638 PAK200989_01A ©2025 ELMDENE INTERNATIONAL LTD
Documents / Resources
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ELMDENE ACCESS-PSU2-8A Switch Mode Power Supply Unit [pdf] Owner's Manual ACCESS-PSU2-8A, MULTI-ACCESS-PSU2, PSU4, PSU6, ACCESS-PSU2-8A Switch Mode Power Supply Unit, ACCESS-PSU2-8A, Switch Mode Power Supply Unit, Mode Power Supply Unit, Power Supply Unit, Supply Unit |