User guide

A120 Power Supplies
890 USE 108 00 August 2001 185
Overload and
Overvoltage
Protection
Should the supply lose regulation it has an internal over voltage protection that
prevents the output from exceeding 35 V. If an over voltage condition is sensed the
the module will shut down and will not restart until the AC input source has been
turned off for a minimum of 5 minutes.
LED Indicator This power supply has one green LED indicating, when on, that the unit is supplying
DC power within regulation (+/- 0.5 VDC). The LED goes off upon loss of regulation.
DANGER
Hazard of Electric Shock, Burn, or Explosion
This equipment must be installed and serviced only by qualified
electrical personnel.
Turn off all power supplying this equipment before working on or
inside equipment.
Always use a properly rated voltage sensing device to confirm power
is off.
Replace all devices, doors, and covers before turning on power to
this equipment.
Take extra precautions if you are using stranded wire. Ensure that
loose or projecting strands do not short-circuit ground or other
terminals. We recommend that you use solid wire.
Failure to observe this precaution will result in death or serious
injury.
Note: It is not recommended that the same power supply be used to power the
Compact 984 and its I/O.
Separate supplies are recommended to reduce the risk of field noise affecting the
controller’s operation. In cases of single supply configurations a field point failure
could cause the power supply, and so the controller, to shut down.