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8
of
11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-14. Isolation Test
Isolation resistance between input/output & signal
ports to shall be more than 100M
at 500VDC. For
safety purposes, voltage setting on DC isolation tester
must be done before the test. Ensure that the unit is
fully discharged after the test.
Input/Output & signal ports ~ : 500VDC, 100MΩ or
more
4-15.
Withstand Voltage
This model is designed to withstand 500VAC between
input/output & signal ports to each for 1 minute.
When testing withstands voltage, set current limit of
withstand voltage test equipment at 100mA. The
applied voltage must be gradually increased from zero
to testing value and then gradually decreased for shut
down. When timer is used, the buffer module may be
damaged by high impulse voltage at timer switch on
and off. Connect input/output & signal ports as
follows :
Input/Output & signal ports ~ : 500VAC
1min 100mA
5. Mounting Directions
5.1. There are 3 mounting methods
recommended.
( A ) Standard Mounting
( C )
Figure 12
Figure 11
DISCHARGING
CHARGING
24VDC/20A
+V
DBM20
1
+V ‐V ‐V
2
3
4
4 +
3 Buffer
2 Ready
1 Inhibit
TD
FIXED MODE
VIN‐1
Buffer
Level
Figure 10
Figure 8
Figure 9
( B )
1 In
hibi
t
4
3
2
1
CHA
RGI
NG
DISC
HA
RG
IN
G
+V
24V
DC/
20A
‐V
‐V
+V
DBM
20
Leve
l
Buffe
r
VIN
‐1
FIX
ED M
OD
E
TD
2 Re
ady
3 Bu
ffer
4 +
