ABB AC 800M, Installation Manual

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Network Voltage Drop Budget Section 2 Transmission Media and Components
56 9ARD000015-600
DeviceNet requirements. Maximum tolerance for the DeviceNet system is 24 volts
+/- 4.0%.
Network Voltage Drop Budget
Table 50 lists the specifications that indicate the actual voltage levels and the
maximum tolerances provided for power configuration on DeviceNet.
Table 49. Recommended Tolerance Stack Up for DeviceNet
Specification Parameter
Initial Setting 1.0%
Line Regulation 0.3%
Load Regulation 0.3%
Temperature Coefficient
(1)
(1) The temperature coefficient tolerance of 0.6% is based on an actual
rating of 0.03% per degree C and a 20° C differential between
supplies that are used on the bus. If a supply in one location is an
ambient of 40° C, then it is assumed that other supplies are within
10° C or in the range of 30 to 50° C (or another 20° C range). If this
stipulation is not met and all other tolerances are met, then the power
capability needs to be de-rated.
0.6%
Schottky Diode Drop (0.65 V nominal) 0.75% (of 24 volts)
Time Drift 1.05%
Total Stack Up 4.0%
Table 50. Voltage Drop Budget
Specification Tolerance Actual Voltage
Power Supply Tolerance +/-1% 0.24 V
Total Temperature Drift
(1)
1.8% 0.432 V
Line Regulation 0.3% 0.072 V
Load Regulation 0.3% 0.072 V