bonitron M3534B, Customer Reference Manual

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M3534R 20A
28
Initiating this test on a heavily loaded system of this nature would also
cause the DC bus level to rise. However, the DC bus would stop rising
once current limit is reached.
NOTE: The Boost voltage level is factory preset and is not adjustable in
the field.
M
ETHOD
2: D
ETERMINING
T
HE
T
HRESHOLD
V
OLTAGE
S
ETPOINT
F
OR
A
N
O
FF
-L
INE
A
ND
U
NLOADED
S
YSTEM
1) R
EMOVE INPUT VOLTAGE SUPPLY FROM SYSTEM
.
Disconnect the input voltage to the Ride-Thru while monitoring the DC bus
voltage. As the DC bus drops to the Threshold setpoint voltage, the Ride-
Thru module will become active. The Ride-Thru will then maintain the DC
bus voltage at the Threshold setpoint level for approximately 1 second
while the primary capacitor discharges, at which point, the DC bus will
continue to drop. Read the DC bus voltage as it is being maintained. This
is the Threshold setpoint voltage.
4.4.2.1. A
DJUST
T
HE
S
ETPOINTS
A
ND
R
EPEAT
T
HE
T
EST
Once the actual Threshold voltage has been determined you can make
adjustments, if required, to achieve the optimum setting for your system.
The Threshold voltage should be set to approximately 10% below the
nominal DC bus
under normal load , or 15% below unloaded bus level.
Coordinate to be above the associated inverter's under-voltage trip level,
and below normal line level. Most inverters have an under-voltage trip
point lower than 15% below the nominal DC bus. Some inverters can be
reprogrammed to change this trip level as needed.
Adjustment pot R40 on the 3534R2 control board (see Figure 4-2) is used
to set the "Threshold" voltage level. Adjusting the pot in a clockwise
direction will raise the setpoint level; alternately, a counter-clockwise
adjustment of the pot will lower the setpoint level. The Threshold setpoint
level can be adjusted between 400 and 600V
for “E” and “H” models.
After making the adjustments, repeat the test from Section 4.4.2 to verify
the new setpoint. Fine tune the adjustment and retest as necessary.
4.4.3. A
DJUSTMENT
P
OTS
4.4.3.1. ASB 3534R2 A
DJUSTMENT
P
OTS
The purpose and setting for each adjustment pot provided on the ASB
3534R2 Control board is described below. Please refer to
Figure 4-2: ASB
3534R2 Control Board Features for the locations of each of the adjustment
pots listed below.
R40
–
T
HRESHOLD
Factory set - adjustment BY TRAINED PERSONNEL ONLY!
Clockwise adjustment will increase the setpoint value. This adjustment
pot is factory preset. However, field calibration of this setpoint may be
necessary if the AC line level is more than 7% below the nominal AC
requirement listed on the RTM module nameplate. Contact Bonitron, Inc.
for additional information as needed.