TYPE D4B FLEXITEST SWITCHBOARD METERS
Light Load
ingle-stator sensitivity IS approximately 0.8 percent per
turn. Two-stator sensitivity is approximately 0.35 percent
per turn.
Three-stator sensitivity is approximately 0.25
percent per turn.
Power Factor
Power factor calibration is fixed factory adjusted and
permanent for single-stator meters.
For two- and three·
stator meters, sensitivity is 0.5 percent per turn.
Phase Balance
For two- and three-stator meters, sensitivity is
approx
imately 2.0 percent per turn but will vary with the adjuster
position.
CALIBRATION PROCEDURE
Single phase test speed for single phase meters is 16-2/3
rpm (polyphase meters,
8-1/3
rpm except for -8 meters
which IS
11-1/9
rpm). All meters are tested on a single
phase power source with voltage coils connected in parallel.
The following calibration procedures should be used.
Combined Stator Operation
Connect all current coils in series and observe full load and
li!Jht load registration.
Calibrate light load to full load.
For example, if full load registration 1S 101.0 percent,
calibrate light load to
101.0
percent.
INDIVIDUAL STATOR OPERATION
Two-Stator Meter
Energize the left stator current coil, calibrate full load,
unity power factor to 100 percent registration by turning
the Full Load adjuster screw at the front of the meter.
Calibrate full load, 50 percent lagging power factor to 100
percent registration by turning the Power Factor adjuster
screw on the left stator adjuster bracket.
Energize the right stator. Calibrate full load unity power
factor to 100 percent registration by turning the Phase
Balance adjuster screw on the right stator adjuster bracket.
Calibrate full load, 50 percent lagging power factor to 100
percent registration by turning the Power Factor adjuster
screw on the right stator adjuster bracket.
Three-Stator Meter
Energize the rear stator current coil, calibrate full load,
unity power factor to 100 percent registration by turning
I. L. 42-227
the Full Load adjuster screw at the front of the meter.
Calibrate full load, 50 percent lagging power factor to 1CO
percent registration by turning the Power Factor adjuster
screw on the rear stato1 adjuster bracket from the right
side.
Energize the remaining two stators one at a time. Calibrate
full load unity power factor to 100 percent registration by
turning the Phase Balance adjuster screw on the respective
stator adjuster bracket.
Calibrate full load, 50 percent
lagging power factor to 100 percent registration by turning
the Power Factor adjuster screw on the respective stator
adjuster bracket.
NOTE
Figure 10 shows a D4B-3F meter connected for reactive
measurements on 3-phase, 4-wire wye in a 10 point flexitest
case and with a standard PS-3 phase-shift1ng transformer.
Although the standard PS-3 has a TEST RUN SWITCH,
it cannot be thrown to test as this will result
111
a short
circuit on line voltage.
If
testing is required, the meter
should
be.
tested as a standard KWH meter w1th PS-3
removed from circuit.
BEARING ADJUSTMENTS
1.
Place the meter in the normal operating position.
2.
Insert the upper and lower bearing w1th
the
setscrews
loose.
3. Move the
�
ower bearing until the disk IS slightly below
center in the meter gap.
4. Tighten the lower setscrew, ra1se the uppfn bearing to
obtain 0.005 to 0.010 111ch end play, and tighten the
upper setscrews.
ACCESSORIES
To install a Mark series demand reg1ster or
a
CD
series
contact device on a D-1 ine polyphase meter, see instruction
leaflets:
1
Mark Ia
42·302.11B
2. Mark II
42-302.20
3. Mark Ill
42 302.3B
4. CD 2, -3, -5.
-6
42 950.3
5. CD-i2 and CDI-12A/12B
42-559,42-572,42-573
6.
CD-22 and CDI-22A/12B
42-570,42-572' 42-573
REPLACEMENT PARTS AND REPAIRS
Where
factl1ttt:s
are
limited or where only a small number of
meters an· us1:d, it is recommended that the meter be
returned to the factory for repairs. When returning a meter
for repa1rs, obtain a Returned Material Tag from the
2
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