Cooper TP Workshop Manual_Scant:Layout 1 7/8 ... - Cooper Security

95EN, 85EN, 65ENCurrentDrawn20 of 72Table 1. Voltage DropCable Length (Standard 7/0.2 alarm cable)10m 20m 30m 40m 50m 60m 70m 80m 90m 100m60mA 0.10V 0.19V 0.29V 0.38V 0.48V 0.58V 0.67V 0.77V 0.86V 0.96V80mA 0.13V 0.26V 0.38V 0.51V 0.64V 0.79V 0.90V 1.02V 1.15V 1.28V100mA 0.16V 0.32V 0.48V 0.64V 0.80V 0.96V 1.12V 1.28V 1.44V 1.60V120mA 0.19V 0.38V 0.58V 0.79V 0.96V 1.15V 1.34V 1.54V 1.74V 1.92V140mA 0.22V 0.45V 0.67V 0.90V 1.12V 1.34V 1.57V 1.79V 2.02V 2.24V160mA 0.26V 0.51V 0.77V 1.02V 1.28V 1.54V 1.79V 2.05V 2.30V 2.56V180mA 0.29V 0.58V 0.86V 1.15V 1.44V 1.73V 2.02V 2.30V 2.59V 2.88V200mA 0.32V 0.64V 0.96V 1.28V 1.60V 1.92V 2.24V 2.56V 2.88V 3.20V220mA 0.35V 0.70V 1.06V 1.41V 1.76V 2.11V 2.46V 2.82V 3.17V 3.52V240mA 0.38V 0.79V 1.15V 1.54V 1.92V 2.30V 2.69V 3.07V 3.46V 3.84V260mA 0.42V 0.83V 1.25V 1.66V 2.08V 2.50V 2.91V 3.33V 3.74V 4.16V280mA 0.45V 0.90V 1.34V 1.79V 2.24V 2.69V 3.14V 3.58V 4.03V 4.48V300mA 0.48V 0.96V 1.44V 1.92V 2.40V 2.88V 3.36V 3.84V 4.32V 4.80V320mA 0.51V 1.02V 1.55V 2.05V 2.56V 3.07V 3.58V 4.10V 4.61V 5.12V340mA 0.54V 1.09V 1.63V 2.18V 2.72V 3.26V 3.81V 4.35V 4.90V 5.44V360mA 0.58V 1.15V 1.73V 2.30V 2.88V 3.46V 4.03V 4.61V 5.18V 5.76V380mA 0.61V 1.22V 1.82V 2.43V 3.04V 3.65V 4.26V 4.86V 5.47V 6.08V400mA 0.64V 1.28V 1.92V 2.56V 3.20V 3.84V 4.48V 5.12V 5.76V 6.40V420mA 0.67V 1.34V 2.02V 2.69V 3.36V 4.03V 4.70V 5.38V 6.05V 6.72V440mA 0.70V 1.41V 2.11V 2.82V 3.52V 4.22V 4.93V 5.63V 6.34V 7.04V460mA 0.74V 1.47V 2.21V 2.94V 3.68V 4.42V 5.15V 5.89V 6.62V 7.36V480mA 0.79V 1.54V 2.30V 3.07V 3.84V 4.61V 5.38V 6.14V 6.91V 7.68V500mA 0.80V 1.60V 2.40V 3.20V 4.00V 4.80V 5.60V 6.40V 7.20V 8.00V520mA 0.83V 1.66V 2.50V 3.33V 4.16V 4.99V 5.82V 6.66V 7.49V 8.32V540mA 0.86V 1.73V 2.59V 3.46V 4.32V 5.18V 6.05V 6.92V 7.78V 8.64V560mA 0.90V 1.79V 2.69V 3.58V 4.48V 5.38V 6.27V 7.17V 8.06V 8.96V580mA 0.93V 1.86V 2.78V 3.71V 4.64V 5.57V 6.50V 7.42V 8.35V 9.28V600mA 0.96V 1.92V 2.88V 3.84V 4.80V 5.76V 6.72V 7.68V 8.64V 9.60VVoltage Drop Example 1Figure 10 shows two devices connected to the control unit. The first is 20mfrom the control unit and has 120mA being taken from its auxiliary supply topower detectors. The second is 20m from the first and also has 120mAbeing taken from its auxiliary supply to power detectors. The example showsthat the voltage levels at both nodes is acceptable. The voltage at eachdevice is as follows:1. The total current being drawn at the first device = 180mA + 180mA =360mA.2. Voltage drop to the first device = 360mA @ 20m = 1.15V (see table).3. Voltage at first device = control unit voltage - voltage drop = 13.60 -1.15 =12.45V.4. The total current being drawn at the second device = 180mA.