AMETEK DLM 600W Series - Manual (Page 36)

DLM 600W Series
M362161-01 K 2-12
2.10.2 Remote Sensing
Remote sensing is used during voltage–mode operation to compensate for the voltage
drop across the load wires. It is selected by setting REM SNS of the SETUP switch,
Position-1, to ON. Refer to Figure 4-1.
A separate pair of wires is routed to measure the voltage at the load instead of the local
connection at the output terminals. Refer to Figure 2-4 for a view of the connector, and
Table 2–3 for its pinout. Connect the positive and negative terminals of the sense leads
to the respective terminals of the load.
Special care is required in routing the sensing leads to prevent noise pickup or coupling
to the power leads; refer to Section 2.9.3, Noise and Impedance Effects. The sense
leads should be a twisted–pair of at least AWG #22 wire, and may require shielding in
high noise environments. Connect the shield at only one point, as required to maximize
its effectiveness.
If the unit is set for remote sense (i.e., SETUP switch Position-1 is ON), but the sense
wires to the load are not connected, the unit will revert to local sense. This will also
cause the output voltage, at the rear panel output terminals, to increase nominally 5%
above the programmed value.
If remote sensing is enabled, but the sense leads are not connected to the output, the
power supply will shut down due to OVP. Also, if excessive line drop occurs in the load
wires, an OVP shutdown could be generated because of the secondary OVP circuit that
monitors for abnormal voltage at the rear panel output terminals.
Figure 2-4. Remote Sense Connector