Page top

Global

K7DD

Advanced Motor Condition Monitoring Device

K7DD

Implementing predictive maintenance with real-time condition monitoring of variable speed motors

Item list of K7DD

Software downloads

You can download software for the K7DD

Related Contents

last update: February 1, 2024

Ratings and Specifications

Item Specifications
Operation
power
supply		 Power supply voltage
and frequency		 K7DD-PQMA: 100 to 240 V AC, 50/60 Hz
K7DD-PQMD: 24 V DC
Operating power
supply voltage range		 85% to 110% of the rated voltage
Operating frequency
range		 45 to 65 Hz
Power consumption K7DD-PQMA: 15.7 VA max. (100 to 240 V AC)
K7DD-PQMD: 5.2 W max. (24 V DC)
Recommend
external fuse		 T2A, time delay, high-breaking capacity
Ambient operating temperature -10 to 55°C
Ambient operating humidity 25% to 85%
Storage temperature -20 to 65°C (with no condensation or icing)
Altitude 2,000 m max.
Insulation resistance 20 mΩ min.
Between the power supply terminals and the other terminals;
Between all the terminals and the case;
Between (communications terminals + trigger input terminals + alarm output
terminals) and the other terminals;
Between (voltage input terminals + CT input terminals) and the other terminals
Dielectric strength 2,000 V AC for 1 minute
Between the power supply terminals and the other terminals;
Between all the terminals and the case;
Between (communications terminals + trigger input terminals + alarm output
terminals) and the other terminals;
Between (voltage input terminals + CT input terminals) and the other terminals
Vibration resistance Frequency 10 to 55 Hz, 0.35-mm single amplitude, acceleration 50 m/s²,
10 sweeps of 5 min each in X, Y, and Z directions
Shock resistance 100 m/s2, 3 times each in X, Y, and Z axes, 6 directions
Degree of protection IP20
Terminal block type Push-In Plus
Exterior color Black (Munsell N 1.5)
Mounting DIN Track
Weight Approx. 360 g
Wiring
material		 Wire type Solid or Stranded wire
Wiring material Copper
Recommended wires 0.25 to 1.5 mm2
AWG 24 to AWG 16
Stripping length
(without ferrules)		 8 mm *, 10 mm, 12 mm * without ferrules
Installation environment Operation voltage: EN/IEC 61010-1 Pollution Degree 2, Overvoltage category II
Measurement circuit: EN/IEC 61010-2-030 Pollution Degree 2, CAT II 600 V or
CAT III 300 V
Industrial electromagnetic
environment		 EN/IEC 61326-1 Industrial electromagnetic environment
Safety standards UL61010-1, Korean Radio Waves Act (KS C 9610-6-2, KS C 9811), RCM, UKCA

Measurement Specifications

Item Specifications Conditions
Input range
(Displayable
range)		 Current 5 A range: 0.275 to 5.5 A
25 A range: 1.375 to 27.5 A
100 A range: 5.5 to 110.0 A
200 A range: 11.0 to 220.0 A
400 A range: 22.0 to 440.0 A		 Defined by R.M.S. values using a sine wave.
The power frequency must be within the acceptable
range.
Voltage 150 V range: 8.3 to 165.0 V
300 V range: 16.5 to 330.0 V
600 V range: 33.0 to 660.0 V
Power
frequency		 40 to 250 Hz Sine-wave or single-order harmonic content must
be 20% or less.
Input ratings
(Measurement
accuracy
guarantee
range)		 Current 5 A range: 1.0. to 5.0 A
25 A range: 5.0 to 25.0 A
100 A range: 25.0 to 100.0 A
200 A range: 100.0 to 200.0 A
400 A range: 200.0 to 400.0 A		 Defined by R.M.S. values using a sine wave.
The power frequency must be within the acceptable
range.
Voltage 150 V range: 75.0 to 150.0 V
300 V range: 150.0 to 300.0 V
600 V range: 300.0 to 600.0 V
Power
frequency		 45 to 245 Hz Since wave
Measurement
accuracy
(Ambient
temperature:
10 to 30°C)		 Current Absolute accuracy: 0.5%FS±1digit
Repeat accuracy: ±1%rdg±1digit		 Not including accuracy variation of CTs
The power frequency must be within the rated range.
Voltage Absolute accuracy: 0.5%FS±1digit
Repeat accuracy: ±1%rdg±1digit		 The power frequency must be within the rated range.
Active/
reactive
power		 Absolute accuracy: ±2%FS±1digit
Repeat accuracy: ±1%rdg±1digit		 Power factor 1
The power frequency must be within the rated range.
Power
frequency		 Absolute accuracy: 0.5%FS±1digit
Repeat accuracy: ±1%rdg±1digit		 Sine wave

Measurement Target

The K7DD can measure both the voltage and current or only the current of power lines that drive motors, valves, and other measurement targets.
There are three wiring methods depending on the phase-wire system of the power supply.

K7DD Specifications 3

Calculable Feature List

Name Single-phase current 3P3W2M 3P4W
Voltage R.M.S. value --- Possible Possible
Fundamental amplitude --- Possible Possible
Waveform peak + --- Possible Possible
Waveform peak - --- Possible Possible
Total harmonic distortion --- Possible Possible
Unbalance factor --- Possible Possible
Current R.M.S. value Possible Possible Possible
Fundamental amplitude Possible Possible Possible
Waveform peak + Possible Possible Possible
Waveform peak - Possible Possible Possible
Total harmonic distortion Possible Possible Possible
Unbalance factor --- Possible Possible
Power Active --- Possible Possible
Deactive --- Possible Possible
Apparent --- Possible Possible
Power factor --- Possible Possible
Harmonic Current content rate Possible Possible Possible
Frequency Possible Possible Possible

When this unit is combined with Condition Monitoring Configuration Tool software, all of the above features can be checked.
The measurement values that can be checked by this unit alone are as follows.
R.M.S. voltage, R.M.S. current, voltage fundamental amplitude, current fundamental amplitude, active power, power factor, frequency, voltage total harmonic distortion, and current total harmonic distortion

Trigger Input Terminals

Item Specifications
Input type NPN open-collector
Residual voltage at short circuit 1.5 V max.
Open leakage current 0.1 mA max.
ON current at short circuit Approx. 7 mA
Minimum detection time Received as a valid continuous input for at least 50 ms for both ON and OFF.

Output Specifications of Transistor Output Terminals

Item Specifications
Transistor output
(Alarm output,
Output at error)		 Contact form NPN open collector
Rated voltage 24 V DC (maximum voltage: 26.4 V DC)
Maximum current 50 mA
Leakage current when power turning OFF 0.1 mA max.
Residual voltage 1.5 V max.

Communications Specifications

Item Specifications
RS-485
communications 1
RS-485
communications 2		 Transmission path
connection method		 RS-485: Multidrop
Communications method RS-485 (2-wire, half duplex)
Cable length When the baud rate is 115.2 kbps or less, the maximum length is
500 m with a shielded twisted-pair cable.
When the baud rate is 230.4 kbps, the maximum length is 200 m
with a shielded twisted-pair cable.
Protocol Modbus RTU
Baud rate 9.6 kbps/ 19.2 kbps/ 38.4 kbps/ 57.6 kbps/ 115.2 kbps/ 230.4 kbps
Data length Always 8 bits
Stop bits Always 1 bit (with parity being even/odd)
Always 2 bits (with parity being none)
Connection configurations 1:1 or 1:N
Maximum number of Units 32 Units (including the host system)
Parity None/Even/Odd
Send wait time 0 to 99 ms

Ratings and Specifications of CT*1

Model K6CM-
CICB005(-C)		 K6CM-
CICB025(-C)		 K6CM-
CICB100(-C)		 K6CM-
CICB200(-C)		 K6CM-
CICB400(-C)
Construction Internal split type
Primary-side rated current 5 A 25 A 100 A 200 A 400 A
Rated voltage 600 V AC
Secondary winding 3,000 turns 6,000 turns
Insulation resistance Between output terminal and case: 50 mΩ min
Dielectric strength Between output terminal and case: 2,000 V AC for 1 minute
Protective element 7.5 V clamp element
Allowable number of attachments
and detachments		 100 times
Diameter of wire attachable *2 7.9 mm dia.
max.		 9.5 mm dia.
max.		 14.5 mm dia.
max.		 24.0 mm dia.
max.		 35.5 mm dia.
max.
Operating temperature and
humidity range		 -20 to 60°C, 25% to 85% (with no condensation or icing)
Storage temperature and
humidity range		 -30 to 65°C, 25% to 85% (with no condensation or icing)
Supplied cable length 2.9 m
Supplied cable terminal K7DD side: Ferrule, CT side: Round crimp terminal
Degree of protection IP20

*1. To comply with UL certification, refer to Conformance to Safety Standards.
*2. When you use a flat wire, refer to the outline dimensional drawing of the relevant CT and use a CT with a larger diameter.
      However, use the CT within the range of its rated current.

last update: February 1, 2024

Product Category

Site Information

© Copyright OMRON Corporation 2007 - 2025. All Rights Reserved.