Avago Technologies ACPL-224-500E - Manual (Page 51)

AV02-4387EN 48 Avago Technologies
Shunt Resistor Shunt Unit Price Tolerance Temp. Max. RMS Motor Power Range
Part Number Resistance @ 2500 Qty. Coefficient Current 120 Vac - 440 Vac
(m Ω) (US$) ( % ) (ppm/°C) (A) (hp) (kW)
PBV-R050-0.5 50 $3.74 0.5 <30 3 0.8 - 3 0.6 - 2
PBV-R020-0.5 20 $3.74 0.5 <30 7 2 - 7 1.4 - 5
PBV-R010-0.5 10 $3.74 0.5 <30 14 4 - 14 3 - 10
PBV-R005-0.5 5 $4.09 0.5 <30 25 [28] 7-25 [8-28] 5-19 [6-21]
PBV-R002-0.5 2 $4.09 0.5 <30 39 [71] 11 - 39 8 - 29
[19 - 71] [14 - 53]
High Performance Four-Terminal Shunt Resistor Selection Guide (Supplier: Isotek, Tel: 508-673-2900)
Note: Values in brackets are with a heatsink for the shunt.
Shunt Resistor Shunt Price Tolerance Temp. Max. RMS Motor Power Range
Part Number Resistance Range Coefficient Current 120 Vac - 440 Vac
(m Ω) (US$) ( % ) (ppm/°C) (A) (hp) (kW)
LV-5.005 5 $0.40 - 1.00 1 <300 28.3 8 - 28 6 - 21
LVR-3.01 10 $0.38 - 0.76 1 <300 14.1 4 - 14 3 - 10
LVR-3.02 20 $0.38 - 0.76 1 <300 7 2 - 7 1.4 - 5
LVR-3.05 50 $0.38 - 0.76 1 <300 2.8 0.8 - 3 0.6 - 2
WSC-2.02* 20 $0.38 - 0.76 1 <300 7.1 2 - 7 1.4 - 5
Low Cost Two Terminal Resistor Selection Guide (Supplier: Dale Electronics, Tel: 402-564-3131)
* Surface Mount
Motor Control Applications
Shunt Resistor Selection for Current Sensing
Avago Technologies recommends
Dale Electronics’ two-terminal shunt
resistors for low cost applications.
These resistors are suitable for meas-
uring current up to 28 A
rms
. See
comparison table below.
Several four-terminal shunts from
Isotek suitable for sensing currents
in motor drives up to 71 A
rms
(71
hp or 53 kW) are shown in the com-
parison table below; the maximum
current and motor power range
for each of the PBV-series shunts
are indicated. For shunt resistance
from 50 mW down to 10 mW, the
maximum current is limited by
the input voltage range of the iso-
lated modulator. For the 5 mW and
2 mW shunts, a heat sink may be re-
quired due to the increased power
dissipation at higher currents.
The current-sensing shunt resis-
tor should have low resistance to
minimize power dissipation, low in-
ductance to minimize di/dt induced
voltage spikes which could ad-
versely affect operation, and reason-
able tolerance to maintain overall
circuit accuracy. Choosing a par-
ticular value for the shunt is usually
a compromise between minimizing
power dissipation and maximizing
accuracy. Smaller shunt resistance
decrease power dissipation, while
larger shunt resistance can improve
circuit accuracy by utilizing the full
input range of the isolated modula-
tor.