Weatherall WPSU-24 Series User manual

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Installation Manual for WPSU-24 Series 240VAC to 24VDC
UPS Power supplies
Model
Output Current Battery Life
WPSU-24-01B/4 1A 1.2 / 2.3 /3.2 /7 Ah
WPSU-24-03B/4 3A 1.2 / 2.3 /3.2 /7 Ah
WPSU-24-05B/4 5A 1.2 / 2.3 /3.2 /7 Ah
WPSU-24-01A 1A N/A

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Overview
The Weatherall WPSU-24 series of power supplies are switched mode power
supplies with three normally closed volt-free outputs for signalling status and
serviceability of the units.
The power supplies all provide a nominal 27.4V when powered from a 230V AC
supply and a nominal 24V when powered from standby batteries.
The power supplies have the following features: -
•PSU fault volt-free output and LED display
•Battery fault volt-free output and LED display
•AC power status volt-free output and LED display
•On/Off power switching control input with pull-up, compatible with voltage-free
contacts
•Jumper for selecting inverted or normal power switching operation
•Status LED display indicating normal/standby operation and On/Off switching
status
•Power supply internal fault monitoring
•Over-voltage output protection
•Inductive and capacitive load switching surge protection and snubbing
•Intelligent electronic fuse output protection with automatic reset
•Highly efficient power conversion –better than 85%
•Constant current battery charging
The switched output is designed for highly inductive loads such as access control
door strikes and locks and is protected to control high voltage back-EMF spikes.

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Layout WPSU-24 VFO
The board is largely enclosed in a screening can.
Installation
•Mount the metal enclosure onto the wall.
•Connect the Live, Earth and Neutral terminals to an un-switched fused spur.
•Connect the On/Off switching control to the control unit. Select the mode of
operation using the jumper (see page 4).
•Connect the Normally Closed relay outputs to the monitoring equipment used to
report and signal equipment faults.
•Connect the 24v power output to the system.
•Fit the battery connectors as appropriate (2 x 7AH batteries in B box; 2 x 7AH or 2
x 17AH in C box).
• Switch on the AC supply and confirm that the “AC OK” LED is lit.

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Battery Protection
The batteries and electronic circuitry are protected against reverse polarity connection by a
self-resetting electronic fuse.
Maintenance
This unit should be serviced by trained factory personnel only . There are no user
serviceable parts . No Maintenance is required other than periodic testing and replacement
of the standby batteries.
PLEASE NOTE THAT HIGH VOLTAGE IS PRESENT UNDER THE
CAGE- HANDLE WITH CARE . DO NOT TOUCH. DO NOT REMOVE
THE CAGE.
For further information on routine battery replacement , please contact Weatherall
Equipment and Instruments Ltd
INDICATIONS

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
External Power Supply (AC Supply)
The power supply has a three-way terminal block for Live, Earth and Neutral
connections. Mains earth is isolated from the 0v output. When supplied boxed,
mains earth is connected to the metal enclosure.
On/Off Input
This input is 30V tolerant and 5V logic compatible. It has an internal 100K resistor
pull-up connected to 5V and is designed to work with 5V logic outputs, NO and NC
voltage free contacts and open collector outputs.
If the jumper is not fitted and the On/Off input is left unconnected, the power supply
will be switched on and operation as normal.
Switching examples are shown below:
Outputs
24V Power Output
The voltage output varies depending on load from a nominal 27.4V output when
operating normally from 230V AC power to a nominal 24V without AC power,
depending on load and battery condition, finally dropping to about 21V before
automatic battery disconnection. The output is rated at a maximum of 5A (BATPSU-600-
VFO-5) . 3A (BATPSU-600-VFO-3) and 1A (BATPSU-600-VFO-1).
The output is electronically protected against short-circuit and overload.
Battery Charging Output
Two connectors are provided to connect two 12V lead acid batteries in series to
give 24 volts to the PSU. When AC power is present the batteries are float charged
at a nominal 27.4 volts current limited to about 300mA. The battery charging output
is power limited to prevent short circuit damage

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Relay Outputs
Three optically isolated voltage-free relay outputs are provided. The outputs are rated at
60V at 100mA with a “contact“ resistance of 16 Ohms. The relays are normally activated
when the PSU is in a “no fault” condition, providing normally closed contacts. The contacts
will be opened when the PSU has all power removed from it.
AC Fault
The AC Fault relay will open when a low AC input of below a threshold of 175V ±25V is
detected.
NOTE: The AC supply must be isolated before investigating an AC fault as a high residual
voltage may be present.
Battery Fault
The following battery faults are registered:
1. Battery disconnected.
2. Low battery - detected when battery voltage is lower than 22V and reset when battery
voltage is higher than 23V.
The relay is opened when either of the above faults is detected.
PSU Fault
The PSU fault relay will open when any of the following faults are detected:
1. Thermal shutdown.
2. Undefined internal fault.
3. Battery charging fault.
4. Output fuse fault.

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Fault Finding
The LED displays can be used to identify a number of different possible faults on the
system as shown in the table below:
*overvoltage is an output voltage over 30V DC. The output will switch off until the unit is
powered down and reset by reconnecting the power.

Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: [phone]
E: sales@weatherall-
uk.com
W:www.weatherall-uk.com
Power Supply Type A, Ungraded, Environmental
Class 2
AC Input Voltage 230v +10%-15%. 50Hz + 15 %
AC Input fuse 20mm anti-surge fuse rated at 230V, 2A or
3.15A
Output Voltage 24v nominal
Output ripple Less than 100mV
Battery recharge time Less than 72 hours
Operating temperature range -10 deg C to +50 deg C
Specifications :
PCB
“A” Housing
“B” Housing
Size (H x W x D
mm) 130 x 100 x 38 235 x 170 x 85 260 x 320 x87 400 x420 x87
Weight (Kg ) 0.19 2.0 3.2 4.3
Sizes and Weight :
“C” Housing