Tyco Safety Products / Software House PI26 사용자 설명서

Calculating Maximum Wiring Lengths

apC/8X Technical Manual

1a. Calculate Voltage Drop for RM A

Multiply 50 ft. * .1 A * .00879 = .04395 volts dropped for RM A

1b. Calculate Voltage Drop for RM B

Multiply (50 ft. + 500 ft.) *.1 A * .00879 = .48345 volts dropped

Multiply (550 ft.) *.1 A * .00879 = .48345 volts dropped for RM B

1c. Calculate Voltage Drop For RM C

Multiply (50 ft. + 500 ft. + 250 ft.) *.1 A * .00879 = .7032 Volts dropped

Multiply (800 ft.) *.1 A * .00879 = .7032 volts dropped for RM C

2. Add Voltage Drop for each Reader = Total Volts Dropped

Add .04395 (A) + .48345 (B) + .7032 (C) = 1.2306 Total Volts Dropped

3. Subtract Total Volts Dropped from Original Supply

12.0 VDC (original) - 1.2306 (volts dropped) = 10.7694 VDC remaining

4. Is remaining voltage sufficient to operate the readers?

The RM-4 requires at least 7.5 volts to operate properly.
All RM-4 readers in the chain must have at least 7.5 volts.
10.7604 volts is sufficient to power the RM-4 reader chain.