Current Shunt - BLUE SKY IPN ProRemote Installation And Operation Manual

CURRENT SHUNT (IPN ProRemote-S)
➢ CAUTION: A 500A/50mV current shunt must be used with the IPN ProRemote (IPN ProRemote-S). The shunt is used
to measure net battery current and must be installed in series with battery negative. Damage caused by installation in
series with battery positive will void the limited warranty. All negative current carrying conductors from all charging
sources and loads must connect to the charge controller side of the shunt as shown in Figure 6 such that all current
flowing to or from battery negative flows through the shunt. Current carrying conductors (other than the shunt)
attached to battery negative will produce inaccurate battery current readings and amp-hour counting. Shunt signal
cable length should be limited to roughly 300 feet (91.5m) maximum. Tighten shunt power connection bolts to 11 ft-
lb (14.9 nm) and #10 sensing screws to 20 in-lb (2.3 nm). IPN ProRemote shunt signal wire compression terminals
are to be tightened to 2.1 in-lb (0.24 nm). Note that the battery temperature sensor lug is not a current carrying
conductor and must remain on battery negative.
Current Shunt Signal Wiring
The shunt itself is not a polarized device. Once installed in series with battery negative it produces the +/– signal polarity shown in Figure 6 when
the battery is being charged. The +/– shunt signal connections must connect to the corresponding +/– IPN ProRemote-S shunt terminal block
locations for proper current polarity reading on the Battery Volt/Amp screen. The shunt produces very sensitive microvolt level signals and signal
wires must be twisted pairs. Lengths less than 35 feet (10.7m) can be unshielded twisted pairs if routed away from power or noise generating
conductors. Shielded twisted pair cable is preferred for lengths greater than 35 feet (10.7m) or where electrical noise is expected. Terminate shield
drain wire to earth ground at one end only.
Resetting Current Shunt Zero
The sensitive nature of the shunt signal measurement circuits can produce a slight drift or offset in the zero reading (0.0A) due to several factors
including normal electronic component aging. A Reset Current Shunt Zero function is provided to compensate for zero offset and provide an
accurate zero reading.
➢ CAUTION: It is critically important that a Reset Current Shunt Zero function not be performed without first
providing a true zero current signal to the IPN-ProRemote. This is accomplished by temporarily placing both shunt
sensing wires at the current shunt under the same #10-32 signal screw. Failure to provide a true zero signal in this
manner before executing the Reset Current Shunt Zero function will result in inaccurate battery current readings and
amp-hour counting.
Do not confuse small charge or discharge currents flowing in the shunt due to normal system operation as zero offset error. For the purpose of
testing the accuracy of the current shunt measurement system zero, a true zero must be applied as described above. Failure to provide a true zero
signal in this manner will not reflect the true accuracy of the current shunt measurement system zero.
To reset current shunt zero and remove zero offset error:
1. Place both shunt signal wires under the same #10 shunt sense signal screw on the current shunt to provide a true zero signal.
2. Perform the Reset Current Shunt Zero function from the Setup Menu.
3. Press BACK twice to return to the Battery Volt/Amp screen to examine the new zero reading. If zero is not within 0.1A or better repeat
the Reset Current Shunt Zero function and check again.
4. Zero offset correction data is now stored in memory and retained if power is lost.
5. Return current shunt signal wires to their normal shunt sense screw positions.
CHARGE CONTROLLER CONNECTION
Each charge controller includes an IPN DISPLAY connector which provides power and IPN network connection. The IPN ProRemote can plug into any
charge controller on the network using the standard 4 conductor RJ-11 voice telephone cable supplied.

➢ Standard 4-pin telephone cables swap pin numbers end-to-end. If cables are custom terminated or cable
couplers are used, be certain pin swap is maintained. Do not plug into anything other than a IPN-compatible
communications port. Total maximum cable length should be limited to approximately 500 feet (152.4m).
RJ-11 Modular plug
Viewed from open end
Where cable is inserted
Pin 1
Blue Sky Energy | USA | www.blueskyenergyinc.com
NETWORK / POWER CABLE SCHEMATIC
Standard 4-pin telephone cable pin swap
FIGURE 7
Installation and Operation Manual
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