Power Meter Bulletin No. 3020IM9503R6/98
Contents December 1998
6-4: Power meters connected to a personal computer via serial port ............. 40
6-5: Daisychaining the RS-485 communications terminals ............................. 42
6-6: Connecting the power meter as the first device
on a PM&CS or Modbus communications link ...................................... 42
6-7: Terminating power meter with MCTAS-485 ............................................. 44
6-8: Terminating power meter with terminal block and MCT-485 .................... 45
7-1: Navigating power meter parameters ........................................................ 48
7-2: Power meter display buttons.................................................................... 51
7-3: Power meter setup flowchart ................................................................... 53
8-1: Power factor min/max example................................................................ 59
8-2: Default VAR sign convention ................................................................... 59
8-3: Alternate VAR sign convention ................................................................ 60
9-1:
How the power meter handles setpoint-driven alarms ...............................
67
9-2: Sample event log entry ............................................................................ 67
B-1: Dimensions of power meter and display .................................................. 72
D-1: 240/120 V 1-phase, 3-wire direct voltage connection with 2 CTs ............ 76
D-2: 3-phase, 4-wire delta with 3 PTs and 3 CTs ............................................. 77
D-3: 3-phase, 4-wire wye, 3-wire load with 3 PTs and 2 CTs........................... 78
H-1: 2-wire Modbus or Jbus wiring ................................................................ 103
Tables
1-1: Summary of Power Meter Instrumentation ................................................ 2
1-2: Class 3020 Power Meters and Accessories............................................... 2
1-3: Components for assembling custom length cables ................................... 2
1-4: Power Meter Feature Comparison ............................................................. 3
4-1: Typical Locations for Mounting Display.................................................... 12
5-1: System Connection Types ....................................................................... 21
5-2: Control Power Transformer Sizing ........................................................... 22
6-1: Maximum Distances of Comms Link at Different Baud Rates ................. 41
6-2: Labeling the CAB-107 Leads ................................................................... 43
7-1: Selecting Voltage Ranges for System Types ........................................... 50
7-2: Factory Defaults for Power Meter Setup Parameters .............................. 52
8-1: Real-Time Readings ................................................................................ 57
8-2: Energy Readings ..................................................................................... 61
8-3: Power Analysis Values ............................................................................. 62
8-4: Demand Readings ................................................................................... 63
D-1: Power Meter System Wiring Connections ............................................... 75
H-1: Maximum Distances of 2-Wire Modbus or Jbus
Comms Link at Different Baud Rates ................................................... 103
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