Specifications

TTL INTERLOCK SHUTDOWN (OPTIONAL)
The PD Series comes with an optional TTL enable/disable function. This is accomplished using a BNC
connector on the rear of the power supply.
A ‘Low Signal’ less than 2.8Vdc signal into the TTL input will enable the TTL Shutdown function; it will
disable the power supply output. The display will indicate the unit been shutdown and the unit will
continuously beep. By inputting a “High Signal” into the unit, the signal will disable the TTL Shutdown
function and allow further operation.
A ‘High Signal’ greater +2.4Vdc signal input into the TTL input port allows the power supply to operate normally.
OUTPUT TERMINALS AND WIRES
All models have terminal connectors on the rear panel; a positive terminal, a negative terminal, a positive
remote sense terminal, a negative remote sense terminal, and an earth ground terminal.
NOTE: The power supply is set at the factory for local sense operation (i.e. the +S and –S terminals are
connected to the "+" and "-" terminals by a jumper wire at the rear connector). When operating in remote
sense mode, remove the jumpers and refer to the section on remote sense.
Additionally, some models have positive and negative terminals in the front of the unit. Brief definition of
remote sense is “a measurement of voltage at the load rather than at the output terminals”. Local connections
are made to the "+" and "-" terminals of the power supply and wrap and bundle wires to reduce coupling
effect.
In order to safely and sufficiently handle electric current, the proper wire size must be used. Select a wire size
with sufficient rating to carry the current without overheating. Other factors to be taken into consideration are
voltage drop and conductor temperature.
TTL INPUT
1-10