User’s Manual
27
Subtracting the Boost voltage (100VDC) from this reading shows that the
actual Threshold voltage level is 585VDC.
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.
For 40 & 85 Amp units:
Adjustment pot R35 on the 3534R3 control
board (see Figure 4-1) 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 “EH” 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
3534R3
A
DJUSTMENT
P
OTS
The purpose and setting for each adjustment pot provided on the ASB
3534R3 Control board is described below. Please refer to Figure 4-1 for
the locations of each of the adjustment pots listed below.
R30
–
I
NPUT
C
URRENT
-L
IMIT
Factory set ---- do not adjust!
Clockwise adjustment will increase the setpoint value. However, this
adjustment pot is factory preset; therefore no field calibration of this
setpoint will be necessary.
R35
–
T
HRESHOLD
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