Page top

K7GE-MG

Insulation Resistance Monitoring Device

K7GE-MG

Reliable, Safe and Accurate Automatic Insulation Resistance Measurements

Software Download

You can download software for the K7GE-MG.

about this Product Family

Ratings and Specifications

Item Specifications
Power supply voltage
and frequency
K7GE-MGMA: 100 to 240 VAC, 50/60 Hz
K7GE-MGMD: 24 VAC, 50/60 Hz, 24 VDC
Operating voltage range 85% to 110% of the rated voltage
Operating frequency
range
45 to 65 Hz
Power consumption Maximum Unit configuration: one Main Unit and eight Probe Units
12.9 VA max. (100 to 240 VAC)/7.8 VA max. (24 VAC)/4.7 W max. (24 VDC)
Minimum Unit configuration: one Main Unit and one Probe Unit
8.4 VA max. (100 to 240 VAC)/4.6 VA max. (24 VAC)/2.5 W max. (24 VDC)
Ambient operating
temperature
-10 to 55°C (with no condensation or icing)
Ambient operating
humidity
25% to 85% (with no condensation)
Storage temperature -20 to 65°C
Altitude 2,000 m max.
Recommended fuse T2A, time delay, high-breaking capacity (for Main Unit operating power supply)
Tripping current: 7 A max., fast-blow (for Probe Unit voltage input)
Insulation resistance 20 MΩ min.
Between all external terminals and the case, between all power supply terminals
and all other terminals, between PE terminal, and trigger input terminal,
all communications terminals and all transistor output terminals
1,000 MΩ min.
Between Probe Unit voltage monitoring terminal and PE terminal
Dielectric strength 2,000 VAC for 1 minute
Between all external terminals and the case, between all power supply terminals
and all other terminals, between PE terminal, and trigger input terminal,
all communications terminals and all transistor output terminals
1,000 VDC for 1 minute
Between Probe Unit voltage monitoring terminal and PE terminal
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 mounting
Weight Main Unit: Approx. 156 g
Probe Unit: Approx. 63 g
Installation environment Operation power supply: EN/IEC 61010-1 Over-voltage category II Pollution degree 2
Measurement circuit: EN/IEC 61010-2-030 Pollution degree 2
For details about the measurement category, refer to Cataloge.
Electromagnetic
environment
EN/IEC 61326-1 Industrial electromagnetic environment
Safety standards UL 61010-1, CAN/CSA-C22.2 No.61010-1
Korean Radio Waves Act (KN 61000-6-2 and KN 11)
RCM
Wiring
material
Wire type Solid wire or stranded wire
Wiring material Copper
Recommended
wire
0.25 to 1.5 mm2
AWG 24 to AWG 16
Stripping length
Without ferrules
8 mm

Measurement Specifications

Item Specifications
Measurement range 0.1 to 99.9 MΩ (0.0 MΩ for less than 0.1 MΩ)
Measuring accuracy ±5% rdg. ±1 digit
(at ambient temperature -10 to 55°C and ambient humidity 25% to 65%)
Megger voltage 50 VDC
Measurement operation Perform one measurement operation for each trigger. One-shot trigger.
Average count Disabled (1 time)/Enabled (8 times)
Measurement target Single-phase/3-phase AC induction motors
An inverter-driven motor requires a contactor on the secondary coil of the inverter.
Similarly, a servo motor requires a contactor on the secondary coil of the Servo Drive.
A motor with a star delta starter requires a delta connection or a star connection for measurement.
Also able to measure DC motors.

Input Specifications of Trigger Input Terminals

Item Specifications
Input type No-voltage contact and open collector are possible.
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
Contact form NPN open collector
Rated voltage 24 VDC (maximum voltage: 26.4 VDC)
Maximum current 50 mA
Leakage current when power turning OFF 0.1 mA max.
Residual voltage 1.5 V max.

Input Specifications of Voltage Input Terminals

Item Specifications
System voltage
(All are specified
as line voltage)
AC waveform:
<Single-phase, 2-wire, N-phase ground>
Sine waveform: 100 to 600 VAC, -15% to 10%, 50/60±5 Hz
Thyristor waveform: 100 to 600 VAC, -15% to 10%, 50/60±5 Hz (0° to 150° dia.)
Inverter waveform: 100 to 600 VAC, -15% to 10%, 20 to 85 Hz
<3-phase, 3-wire, S-phase ground>
Sine waveform: 100 to 480 VAC, -15% to 10%, 50/60±5 Hz
Thyristor waveform: 100 to 480 VAC, -15% to 10%, 50/60±5 Hz (0° to 150° dia.)
Inverter waveform: 100 to 480 VAC, -15% to 10%, 20 to 85 Hz
<3-phase, 4-wire, N-phase ground>
Sine waveform: 100 to 600 VAC, -15% to 10%, 50/60±5 Hz
Thyristor waveform: 100 to 600 VAC, -15% to 10%, 50/60±5 Hz (0° to 150° dia.)
Inverter waveform: 100 to 600 VAC, -15% to 10%, 20 to 85 Hz
DC waveform: 24 to 480 VDC, -15% to 10%

Communications Specifications

Item Specifications
Physical layer RS-485
Transmission path connection
method
RS-485: Multidrop
Communications method RS-485 (2-wire, half duplex)
Synchronization method Asynchronous
Connection configurations Master and Slave configurations are 1:1 or 1:N connections.
Maximum number of Units 32 (including one host system)
Cable length Total 500 m max. (twisted-pair cable)
Baud rate 9.6, 19.2, 38.4 or 57.6 kbps
Data length 7/8 bits
Stop bits 1/2 bits
Error detection Vertical parity (none/even/odd)
BCC (with CompoWay/F selected), CRC-16 (with Modbus RTU selected)
Flow control None
Retry function None
Buffer 97 bytes
Send wait time 0 to 99 ms
Protocol CompoWay/F and Modbus RTU