Table 7-5.--Leading Particulars for the DA-675/MSM Load Bank--Continued
INSTRUMENT SCALES AND NOMINAL ACCURACIES--Continued
DC Ammeter, 0 to 200/400/1000/2000 A
Meter:
1% of full scal
System: 1 1/2% of full scale.
AC Voltmeter, 0 to 150 V
Meter:
1% of full scale.
System: 1% of full scale.
AC Ammeter, 0 to 200/400/800/1600 A
Meter:
1% of full scale.
System: 1 1/4% of full scale.
AC Single Phase Kilowatt Meter with
Meter:
2% of full scale.
System: 2 1/4% of full scale.
transducer, 0 to 20/40/80/160 KW
AC Power Factor Meter with Transducer
Meter:
2% of full scale.
System: 2 1/2% of full scale.
Unity to 0.20
AC Frequency Meter with
Meter:
2 cycles at mid-scale (400 cps) and 4 cycles at scale
extremities.
Transducer 350/400/450 cps
System: 2 cycles at mid-scale (400 cps) and 4 cycles at scale
extremities.
Both ac and dc sections may be continuously
CAUTION
operated at full load simultaneously. The 5-minute and
Select an area where the flow of cooling air
5-second overload tests may be programmed on only
under and around the unit is assured. The unit
one section at a time. However, the section not
dissipates a considerable amount of heat when
programmed for timed overload may be operated at full
loads are applied to the power plant under test.
load continuously during overload testing of the other
section.
2. Open the two air exhaust doors (1, fig. 7-61).
CONTROLS, INDICATORS, AND
EXTERNAL CONNECTION FACILITIES
3. Open the control console cover (7, fig. 7-61).
4. Open the dc panel cover (5, fig. 7-61) and/or the
All operating controls, indicators, connectors, and
ac input panel cover (4, fig. 7-61) as required.
terminal blocks of the MLB-1A are illustrated in
figures 7-61 through 7-64 and described in tables 7-6,
5. Verify that all toggle switches on the control
7-7, and 7-8.
panels, shown in figures 7-62, 7-63, and 7-64,
are in the OFF position.
PREOPERATIONAL PROCEDURE
6. Connect cables from the power plant to
There are two parts to preparing the load bank for
receptacles or terminals on the ac or dc input
operation, setting up, and connecting to the power
panel (2 or 3, figure 7-61), depending on the
source.
power plant to be tested or used.
Setting Up the Load Bank
WARNING
To prepare the load bank for operation, proceed as
NEVER connect a power plant output cable to the
follows:
load bank receptacles or terminal blocks while the
1. Position the load bank within convenient cable
cable is energized.
length for connection to the power plant, and
then set the parking brake (6, fig. 7-61).
7-54
