Webasto PosiCharge DVS Field Service Manual page 20

DVS/GSE
the high current path from the power board to the battery in the vehicle. Check that all
cable connections are tight and that all contactors in the path are functioning properly.
If an invalid pilot signal is indicated, check the BMID wiring per WCSI Doc.
JJ)
#06660-03 and section 3.2.3.
KK) Reseat the power stage Temp Sense connectors. Check the heat sink thermistors
(Resistance should be greater than 60K Ohms when heatsink is cool).
LL) At utility power disconnect box, measure voltage between phases and confirm that all
measurements conform to specifications in WCSI Doc. 08750-10. Contact facility
electrician if any voltage measurements are not within specifications. Turn off power at
utility disconnect and check continuity through main utility fuses at disconnect.
If proper utility voltage is present at disconnect, remove front panel of Power Supply
cabinet and measure line-to-line voltages at input of contactor K1. If voltages at K1 are
not within range, shut down unit, turn off power at utility disconnect, and re-install utility
wiring per instructions in WCSI Doc. 08750-76.
Check fuses F1, F2 and F3 and replace any blown fuses per section 3.4.4. Check all
system wiring and connections because the most likely cause of a blown fuse is improper
wiring.
Check wiring between PowerStation cabinet and Power Supply cabinet per WCSI Doc.
MM)
#08750-20 and correct any wiring problems. Turn unit off then restart and listen for main
contactor, K1, closing. If main contactor does not close within one minute, remove front
panel and troubleshoot K1 per section 3.4.5. If problem persists, troubleshoot
PowerStation cabinet powerstage per WCSI Doc. 06740-04.
NN) Turn off power at utility disconnect. Remove Power Supply cabinet front panel and
troubleshoot unit per section 3.4.6.
Check wiring between PowerStation cabinet and Power Supply cabinet per WCSI Doc.
OO)
#08750-20 and correct any wiring problems. If problem persists, check output of
transformer T3 per section 3.4.7.
PP) Tighten all outside fasteners on DVS. If problem persists, turn off power at utility
disconnect, remove Power Supply cabinet front panel and check/tighten all internal
connectors. If problem persists, remove Power Supply cabinet rear panels and
check/tighten all internal connectors at main transformer T1. If problem persists, check
proper operation of fan, Fan1, per section 3.4.8 and remove any debris from fan
assembly. If problem persists, check for loose components in PowerStation cabinet.
QQ) Shut off power at utility disconnect and remove Power Supply cabinet front panel.
Check all thermal switches per section 3.4.8. If any thermal switches have switched to
the open position, troubleshoot unit for thermal issues per section 3.4.8. Check all wire
connections for loose fasteners, improperly crimped lugs, improperly assembled
connectors and other signs of poor connections. If poor connections are found, repair
connections. Remove rear panels and check/tighten all internal connectors at main
transformer T1.
USE EXTREME CAUTION WHEN TROUBLESHOOTING the DVS WITH
ANY PANEL REMOVED. ELECTRIC SHOCK CAN KILL: Touching live
electrical parts can cause fatal shocks or severe burns. The input power circuitry and
internal circuits are live whenever input power is on.
DANGER
09030-78B
GSE
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DVS
Field Service Manual