Weatherall Equipment &
Instruments Ltd
Unit 1, Station Approach
Wendover, Bucks
HP22 6BN. United Kingdom
T: +44(01296 622180
E:
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
