Allen&Heath GL4000 SERVICE MANUAL - Manual (Page 108)

RPSD2 & RPSD
Shown wired for typical
remote LED display SAFETY WARNING !
Mains electricity is dangerous and can kill. Mains voltage is
present within the RPSD2 and the connected power supply units.
Do not remove the top cover with mains connected. Check your
mains wiring and earthing before switching on. The chassis is
always connected to mains earth to ensure your safety.
DO NOT REMOVE THE MAINS EARTH CONNECTION!
All LEDs steady green = supplies good.
Status LED flashing = supply fault
Status LED off = supply not connected or dead.
RPSD2 INSTALLATION