AMETEK DLM 600W Series - Manual (Page 55)

DLM 600W Series
M362161-01 Rev J 3-9
3.5.2 Resetting OVP
Perform the following to reset the OVP monitor if it has been activated:
1. Reduce the power supply’s output voltage to below the OVP threshold.
2. Ensure that the connections for the power and sense leads are correct.
3. The OVP monitor is reset by toggling OFF and then back ON either of the
following switches or signals: the OUTPUT switch, the POWER switch, the
EXTERNAL–OFF signal of the REMOTE ANALOG INTERFACE, or through the
optional GPIB interface.
3.6 Front Panel Switches
3.6.1 POWER Switch
The POWER switch turns on the autoranging AC input rectifier and the control circuits
of the unit. It initiates a power–up routine (approximately 7 seconds in duration) that
performs an indicator/display test, high speed fan start–up, and range setting of the
rectifier.
The POWER switch does not disconnect the AC input lines from the unit; therefore, the
input filter networks remain connected when the switch is turned off.
3.6.2 OUTPUT Switch
The OUTPUT switch turns the output converter on and off. It will also reset the OVP
and FAULT monitors when it is toggled off and then back on.
When the switch is turned off, the downprogrammer is enabled to discharge the output
capacitors. After a time delay, the downprogrammer is turned off, and the output of the
unit becomes a high impedance. The switch does not disconnect the load from the
output of the unit; therefore, the output filter capacitors and bleeder resistance remain
connected when the switch is turned off.
When multiple units are operated in parallel, the switch functions differently for the
master unit as compared to the slaves. The OUTPUT switch of the master unit will turn
all units off, and each unit will discharge its output filter capacitors. However, the
OUTPUT switch of the slave units will only turn off their individual outputs; also, the
downprogrammer of the slaves will not be turned on.