User manual

DLM4000_Bed_Anleitung_v1.2_oce_eng.doc; 16.06.2009; M.Billmann; 8/13
5 Start up and operating the unit
5.1 Check functionality of DLM4000
Always make sure that the unit is functional before attaching to DC link.
Check for
- damage of cables
- damage of box (cracks, loose bushings)
- internal appearance (smoke, burned components, PCBs)
Then
- Apply 50V
DC
from a laboratory power supply and check for flashing red
LEDs plus analog voltmeter display.
- Reduce power supply voltage to 20V and check for green LEDs to
illuminate while the red LEDs stop flashing. Also observe the change in
position of the voltmeter´s needle.
Hint
The power dissipation of the unit is mainly transferred to the
rear side of the box. Always allow sufficient cooling there. Do
not cover the rear side with thermally isolating material. For
long term use with high voltages consider attaching the rear
side to a cool metal surface using a heat transferring foil or
similar devices. The DLM4000 is designed for operation up to
40°C ambient.
5.2 Prepare DLM4000 for operation
Firmly attach DC link cables to the DC link that has to be monitored. Polarity
is indicated by red [plus] and black [minus] cables, but the unit will also
handle and indicate voltage in reverse polarity without damage. DLM4000
will start operation within much less than a second after applying a voltage
of 35V
DC
or higher.
Warning
Never attach DLM4000 to a life (charged) DC link. Only
connect when DC link is completely discharged.
5.3 Technical data
- Analog moving coil instrument 0-150V
DC
, red bar up to 3,500V
DC
- Box operational within a DC voltage range from 0V to 3,500 V permanent
- Box operational within a DC voltage range < 4,000V for <20msec
- Current into unit < 6mA
- Reverse polarity tolerant
- Ambient temperature 40°C max
- Cable is capable to carry 4kV, even if hand held