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DCA-20PC Series
LED Display, Subminiature DC Ammeters
TECHNICAL NOTES
To ensure safe and reliable operation, DCA-20PC dc ammeters
must be installed and serviced by quali?ed technical personnel.
DC ammeter applications can expose a user to potentially lethal
currents and voltages. Power and load connections must be made
with all associated power sources de-energized. Contact DATEL if
you have any questions regarding installation or operation of any
of our digital instruments.
1. Calibration: DCA-20PC ammeters are factory calibrated using a high-
precision current source. Under normal indoor operating conditions,
periodic recalibration is not necessary. The calibration potentiometer,
located on the back of the ammeter, is a ? turn type; do not force its
adjustment screw past the two end stops. If recalibration is necessary,
it must be performed by quali?ed personnel. Calibration is performed
by applying a precision current source to TB1’s -SHUNT and +SHUNT
terminals. For best results, use a load current that is approximately
95% of the ammeter’s full-scale rating.
The calibration current source and power supply inputs must be con-
nected per the appropriate model-speci?c wiring diagram shown later
in this data sheet. Using an insulated slotted tool, adjust the calibration
potentiometer until the display is within ±1 count of the desired read-
ing. Please note, the potentiometer provides an adjustment range of
approximately ±1%. Contact DATEL if additional information is required
regarding calibration or setup of DCA-20PC ammeters.
2. Wiring and Fusing: Power supply (TB2) and input (TB1) wiring must be
rated for the electrical and environmental conditions under which the
ammeters will be operated. They must also comply with any regula-
tory or application-mandated requirements pertaining to the user’s
installation. Connections to DCA-20PC ammeters must be made with
all power sources de-energized. Refer to the Functional Speci?cations
section for detailed wire type and wire gauge information.
with Built-In Shunts
DCA-20PC ammeters’ power supply and shunt terminals are not
internally fused. Therefore, the supply wires connected to both the
meter and the load must be fused according to the maximum current
rating (or lower) of the wire gauge used, in accordance with applicable
regulatory codes.
Wiring Insulation should be stripped to within +/-10% of the stated
dimensions. All wires must be inserted into the terminal block openings
such that the screw terminal does not pinch any insulation. After ?nal
assembly, inspect all terminal block connections for shorts between
adjacent conductors; this step is particularly important when using
stranded wire.
3. Terminal Block Torque Ratings and Wire Size: It is important to
tighten all TB1 and TB2 screw-terminals to their torque speci?cation
of 4.4 pound-inches (0.5Nm). Proper tightening will minimize thermal/
electrical losses and ensure reliable operation. Under severe operation
conditions (for example, vibration, high continuous load currents, and
wide variations in ambient temperature), 25% over-tightening is permis-
sible. Applications subject to vibration should use stranded wire.
Proper terminal block torque is extremely important on all 20A models
(DCA-20PC-6 part numbers). Loose connections can overheat, thereby
posing a potential ?re hazard to the terminal blocks, the load and
supply wiring, the ammeters themselves, and nearby equipment. 20A
models must use either 14AWG stranded or 12 AWG solid copper
wires only. However, in some applications, regulations can limit the
continuous current ?owing in 14AWG solid or stranded copper wire to
15A maximum.
4. High-Side versus Low-Side Shunts: Incorrect shunt connections
are one of the most common problems encountered when applying
digital dc-ammeters. Incorrect shunt connections can cause permanent
damage to the ammeter and its associated equipment.
DCA-20PC-X- DC1 -XX
DCA-20PC-X- DC1 -XX
DCA-20PC-X- DC1 -XX
1
J3 MUST BE
1
J3 MUST BE
1
REMOVE J3
INSTALLED
INSTALLED
FOR 36-75Vdc
CAL
1
2
J3
(FACTORY
SETTING
FOR 5-40Vdc
SUPPLIES)
CAL
1
2
J3
(FACTORY
SETTING
FOR 5-40Vdc
SUPPLIES)
CAL
1
2
J3
SUPPLIES
SHUNT
MUST BE
IN LOW
SIDE
1
TB1
2
1
TB2
2
TB2-1 & TB2-2
INTERNALLY
SHORTED
SHUNT
MUST BE
IN LOW
SIDE
1
TB1
2
1
TB2
2
TB2-1 & TB2-2
INTERNALLY
SHORTED
SHUNT
MUST BE
IN LOW
SIDE
1
TB1
2
1
TB2
2
TB2-1 & TB2-2
INTERNALLY
SHORTED
–SHUNT
+SHUNT
+V
+V
–SHUNT
+SHUNT
+V
–SHUNT
+SHUNT
+V
+V
(–V)
(–V)
(–V)
–
LOAD
+
–
LOAD
+
–
LOAD
+
LOAD CURRENT
LOAD CURRENT
LOAD CURRENT
–
DC SUPPLY #2
+
–
DC SUPPLY
+
(For Load Only)
–
DC SUPPLY
+
5-40Vdc
36-75Vdc
–
DC SUPPLY #1
5-40Vdc
+
Figure 3. Low-Side Shunt Connections for "-DC1"
Figure 2A. Low-Side Shunt Connections for "-DC1"
5-40Vdc Non-Isolated Supply Models
Figure 2B. Low-Side Shunt Connections for "-DC1"
Models using Two Power Supplies
Models Modi?ed for 36-75Vdc Non-Isolated Power
(See Technical Note 6)
www.murata-ps.com/support
MPM_DCA-20PC.B07 Page 3 of 6
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