Velocity Operation Manual
www.velocitydetection.com
74
AUX SUPPLY FAULT
An interface has lost it`s external 24V
power. Investigate the PSU powering
the interfaces
IN/OUT SHORTED
An interface unit has detected a
short circuit in it`s field wiring,
Investigate & rectify. Check that the
correct end of line resistor is fitted.
IN/OUT OPEN
An interface unit has detected an
open circuit in it`s field wiring,
Investigate & rectify. Check that the
correct end of line resistor is fitted.
OUTPUT STUCK
An Output interface has detected
that its output relay has stuck. Reset
the panel and test again. If the fault
returns, the interface will need to be
replaced.
ISOLATOR FAULT
The internal short circuit isolator on a
device has activated. (Usually 2
devices operate together).
Investigate the wire & devices
between the two isolator fault
devices to find the source of the
short circuit.
AUX SUPPLY LOW
An interface has detected t`s external
24V power is low. Investigate the PSU
powering the interfaces
Devices not seen on a loop
search
Check that the wiring polarity to the
device is correct.
Check that the device has the correct
address
Check that the device is compatible
with the MMP panel
