Service Manual FCD 300
Release 01/2003
19
Revise 08/01/2003 by DD Service Manager, Steffen Sundbæk
13.1. Static test
Checking DC bus charge
(Multimeter in voltage
position)
Check the DC bus for remaining charge by measuring the
voltage on the DC terminals.
Measure between –UDC (hole) and +UDC (82).
The voltage must be less than 10 Volt
.
Wait about 4 min. A resistor (
200 ohm 50 W
) could also be
connected to the –UDC and +UDC terminals, to decrease the
discharge time.
Static Test, Ground
separation
(Multimeter in ohm
position)
Measure from –UDC terminal (hole) and +UDC terminal (82)
to ground in turn.
Each resistance must be above 1 (one) Meg Ohm.
Measure L1 (91), L2 (92) and L3 (93) terminals to the ground
in turn.
Each resistance must be above 1 (one) Meg Ohm.
Measure W (98), V (97) and U (96) terminals to the ground in
turn.
Each resistance must be above 1 (one) Meg Ohm.
Measure between R+ (82) and –UDC terminal (hole) to the R-
(81) in turn.
Each resistance must be above 1 (one) Meg Ohm.
Static Test, Rectifiers
(Multimeter in check
diodes position)
Connect the positive (+) meter lead to –UDC terminal (hole).
Connect the negative (-) meter lead to L1 (91), L2 (92) and L3
(93) terminals in turn.
Each reading should show a diode drop.
*Reverse the meter leads
Connect the negative (-) meter lead to –UDC terminal (hole)
Connect the positive (+) meter lead to L1 (91), L2 (92) and L3
(93) terminals in turn.
Each reading should show open.
Connect the positive (+) meter lead to +UDC terminal (82).
Connect the negative (-) meter lead to L1 (91), L2 (92) and L3
(93) terminals in turn.
Each reading should show open.
*Reverse the meter leads
Connect the negative (-) meter lead to +UDC terminal (82)
Connect the positive (+) meter lead to L1 (91), L2 (92) and L3
(93) terminals in turn.
Each reading should show a diode drop.
