bonitron M3460, Customer Reference Manual

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D_M3460_D_CMAN_vall_00a 4/17/2020
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3. Monitor the DC bus voltage while the M3460 is in Test mode. This is
the DC bus test voltage setting.
The DC bus test voltage setting is approximately 50-100V higher than the DC
bus threshold voltage setting.
For example, for an M3460 with an input voltage of 460VAC, the DC bus
threshold voltage setting is preset to be 585VDC and the DC bus test voltage
setting is preset for an increase of 100VDC. Initiating the test described above
would cause the DC bus voltage to rise to 685VDC (585VDC + 100VDC).
Subtracting the DC bus test voltage (100VDC) from this reading shows that the
actual DC bus threshold voltage setting is 585VDC.
4.8.4. A
DJUSTING THE
DC B
US
T
HRESHOLD
V
OLTAGE
S
ETTING
Adjustment of R7 on the 3460C1 control board (see Figure 4-2) is used to
adjust the DC bus threshold voltage setting. Adjusting the pot in a clockwise
direction will raise the setting. Alternately, a counter-clockwise adjustment of
the pot will lower the setting.
After making the adjustments, repeat the test to verify the new setpoint. Fine
tune the adjustment and retest as necessary.
Figure 4-2: 3460C1 Control Board Layout
1
TB3
TB4
1
LD2
TB1
LD5
TB2
1
TEST
IN
T
J4
E
X
T
LD6
+15V
TB5
1
R7
THRESHOLD
LD3
RIDE-THRU
READY
-15V
LD7
LD4
COMPLETE
PRECHARGE
ACTIVE
RIDE-THRU
3460C1
CONTROL BOARD
by BONITRON
LD1
BLOWN FUSE
J1
T.O.