User Manual

221
MN024-08
If a surge or an overloading condition occur the switch automatically jump into
an OFF position.
TRS/TRSN behaviour at start-up
• Check if power supply voltage selector is in the correct position (115 or 230
Vac). In passive distribution version this selector is not present.
• Have all the switches in off position
• Check the connection polarity is not wrong
•
Power on the TRS/TRSN unit through the back general switch
• Power on each remote unit through the front panel switches
• Check if the remote units shows the proper green supply led on
TRS/TRSN troubleshooting
If the remote unit doesn't appear to be properly supplied:
• Check the fuses on the rear panel
• Check the voltage at the front panel screw connectors: nominal value
without load is -59Vdc, nominal value with full load is -48Vdc. If those
values are exceeded by 10% check if the mains are within the allowed
limits. In passive distribution version, the output voltage depends on the
supply source.
• Check the voltage at the remote side it should be in the range -36 to -72
Vdc that is the maximum allowed range admitted by the remote units.
If the protection switch jump always in OFF position
• Check if there is any short on the line
• Check if the remote unit shows the nominal current power consumption
• Check if there was any long period overshooting related to the mains
supply.
If the fuses blow up after a power-on with all the front switches on, there
should be a too high initial peak current transient: check the proper fuse
(delayed type) or substitute with an higher current fuse (i.e. 6A or 10A). If the
problem still persists check the proper ground /mains connection.
TRS
TRSN