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