1. IDM-3
3-PHASE AMMETER

2. THE IDM-3 THREE-PHASE AMMETER
The IDM-3 is a microprocessor-based three-phase ammeter that provides instantaneous and peak lagged-demand ammeter readings. Operational features of the IDM-3 include keypad programming, sampling, and digital-integration techniques developed for the MPU-16A motor protection unit, and dual isolated analog outputs for a data-acquisition system.

3. IDM-3 3-PHASE AMMETER Compact 1/4 DIN size Panel or surface mount
Isolated analog outputs
Program-change lockout
-40°C to 60°C operating
temperature
Interface current
transformer

4. IDM-3 METERING FUNCTIONS
Digital Display of:
CT-primary rating
Demand response time
Analog output option
Scanned currents
Instantaneous currents
Peak lagged-demand
currents

5. IDM-3 TYPICAL APPLICATION
SUPPLY
PHASE CT'S N
LOAD
ANALOG OUTPUT 1 (SIGNAL) L
A B C
COM
ICT-3 11
PROGRAM CHANGE LOCKOUT 13 14 15 16 17 18 19 20 21 22 23 24 A
ICT B C O M P E - +
SHIELD
IDM-3 12 10 9 8 7 6 5 4 3 2 1 L2 L1
ANALOG OUT
ANALOG OUTPUT
ANALOG OUTPUT 2 (ADDRESS)

6. IDM-3 FACE PLATE LIQUID CRYSTAL DISPLAY MODE digit: Identifies mode
VALUE digits: Display meter readings
PE/ALARM, Red LED
On: Alarm condition
Flashing: Program-change lockout defeated
PROCESSOR, Green LED Indicator On: Processor functional
MODE LIST
MEMBRANE SWITCH KEYPAD
ENTER switch:
Enters value digits
RAMP switch:
Adjusts value digits
MODE switch:
Selects modes “0” through “F”
RESET switch:
Resets peak values

7. ICT-3 INTERFACE CT