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CK3A-G305L / -G310L / -G320L

CK3A-series Direct PWM Amplifier

CK3A-G305L / -G310L / -G320L

This servo amplifier provides ultra-low latency servo control by taking signals directly from the controller and flexibility to connect to various motors and encoders

Item list of CK3A-G305L / -G310L / -G320L

Related Contents

last update: April 1, 2025

General/Mechanical

Item Specification
Number of axes 1
Enclosure Panel mount
Protective case IP20 (built into IP54 panel)
Grounding 200 V class D grounding, 100 Ω or less
Vibration resistance 10 to 60 Hz at an acceleration of 5.88 m/s2 or less
(Not to be run continuously at the resonant frequency)
Air flow clearance Refer to installation section
Mounting screws tightening torque 1.2 Nm
Cooling Natural convection and built-in fan
Weight CK3A-G305L 1.81 kg
CK3A-G310L 2.67 kg
CK3A-G320L 2.77 kg
Dimensions CK3A-G305L 212.5 x 65.0 x 180.0 mm
CK3A-G310L 238.0 x 90.0 x 180.0 mm
CK3A-G320L 238.0 x 90.0 x 180.0 mm
Regulations
and Standards		 Conformance to
EU Directives		 EMC Directive: EN61800-3 second environment
Low Voltage Directive: EN61800-5-1 C2 category
Functional Safety: EN61800-5-2 SIL3 (STO)
Conformance to
UL Directives		 UL Standards: UL 61800-5-1
CSA Standards: CSA C22.2 No. 274
Conformance to
UKCA Standards		 UKCA: 2016 No. 1091
UKCA: 2016 No. 1101
EMC Directive: 2016 No. 1091
Low Voltage Directive: 2016 No. 1101
Functional Safety: 2008 No. 1597
Conformance to
KC Standards		 Immunity Standard for Industrial Environments: KS C 9610-6-2
Emission Standard for Industrial Environments: KS C 9610-6-4

Environmental

Item Specification
Operating ambient temperature 0 to 55 °C
Operating ambient humidity 10 to 90% RH (without condensation or icing)
Storage ambient temperature -25 to 70 °C
Storage ambient humidity 10 to 90% RH (without condensation or icing)
Operating and storage atmosphere Must be free of corrosive gases
Maximum operating altitude 2,000 m
Pollution Degree 2

Electrical

The following section details the key electrical specifications for each of the CK3A-G3[][]L Amplifiers.

Item CK3A-G305L CK3A-G310L CK3A-G320L
Logic power
supply		 Voltage 24 VDC *1
Current consumption 1.5 A
Inrush current 2.5 A
Inrush time 5 msec
Main circuit
power supply		 3-Phase AC Voltage 240 VAC ± 5 °C *2
F.L.A. 6 Arms 11 Arms 18 Arms
Frequency 50 / 60 Hz
1-Phase AC Voltage 240 VAC ± 5% *2
110 VAC ± 5% *3		 240 VAC ± 5% *2, *7
F.L.A. 10.5 Arms 19.5 Arms 28 Arms
Frequency 50 / 60 Hz
1-Phase DC *4 Voltage 48 VDC *5 - 100 VDC ± 10% *6
F.L.A 6 A - 19 A
Output Rated Current 5 ARMS 10 ARMS 20 ARMS
Maximum (peak) Current 10 ARMS 20 ARMS 60 ARMS
Maximum Rated Power
(3-Phase AC)		 1195 W 2390 W 4400 W
Maximum Rated Power
(1-Phase 240 VAC)		 1195 W 2390 W 4400 W
Maximum Rated Power
(1-Phase 110 VAC)		 550 W 1095 W -
Maximum Rated Power
(1-Phase DC)		 195 W - 1600 W
Time at Peak Current 2 sec
PWM Interface Current feedback resolution 16 bits
Maximum current ADC reading 15.735 A 31.470 A 93.844 A
Minimum PWM deadtime 2 μsec 3 μsec
PWM Frequency 8 to 20 kHz 8 to 16 kHz *8
Shunt Resistor Internal shunt resistor 25 Ω, 30 W 17 Ω, 80 W 17 Ω, 80 W
External shunt resistor 20 Ω, 60 W 17 Ω, 60 W 17 Ω, 60 W

*1. The range of acceptable variation for the Logic Power Supply input voltage is 22.0 to 26.4 VDC.
*2. The range of acceptable variation for this Main Circuit input voltage is 170 to 252 VAC.
*3. The range of acceptable variation for this Main Circuit input voltage is 85 to 170 VAC.
*4. All models require the ADC Strobe Word set to operate with low voltage (1-Phase DC) main power input.
*5. The range of acceptable variation for this Main Circuit input voltage is 44 to 60 VDC.
*6. The range of acceptable variation for this Main Circuit input voltage is 90 to 110 VDC.
*7. The CK3A-G320L may require derating on maximum rated power with some (1-Phase AC) Main Circuit input voltages. Refer to the diagram below showing the derating amount at 25°C.
*8. The CK3A-G320L may require derating on maximum rated power if PWM frequency over 10 kHz is used. Refer to the diagram below showing the derating amount.
Note: 1. In addition to configuring the ADC Strobe Word, the CK3A-G310L requires a special part number and factory modification to operate with low voltage (48 VDC) main power input. Contact your local Omron representative for this option.

Power Output De-Rating by 1-Phase Input Voltage (CK3A-G320L Only)

CK3A-G305L / -G310L / -G320L Specifications 6

Power Output De-Rating by PWM Frequency (CK3A-G320L Only)

CK3A-G305L / -G310L / -G320L Specifications 7

Performance

Specification Value Notes
STO input to power drivers OFF < 150 msec
Overcurrent I2T to IPM OFF < 10 msec A8 fault
Phase short to IPM OFF < 3 μsec AC fault
Current loop response time < 1 msec 1 mH 3-Ph brushless Motor Y-winding
Dynamic brake relay response time < 20 msec Mechanical relay time constant
I2T time to Amplifier OFF < 2.5 sec CK3A-G305L: At 200% output
CK3A-G310L: At 200% output
CK3A-G320L: At 300% output
Soft start time < 650 msec Do not enable Amplifier during soft start
Hold at momentary power interruption 10 msec 3-ph 208VAC @ rated load
DC Bus discharge time with bus discharge ON
(Discharge to less than 36 VDC)		 < 2.5 sec Forced discharge to shunt resistor
DC Bus discharge time with bus discharge OFF
Discharge to less than 36 VDC)		 < 5 min Natural discharge, CK3A-G305L
< 5 min Natural discharge, CK3A-G310L
< 6 min Natural discharge, CK3A-G320L
Current ADC clock frequency range 2.450 to 6.250 MHz Set in Controller
Time between main circuit power cycles
with bus discharge ON		 1 min minimum To prevent overloading the soft start or discharge circuitry
Time between main circuit power cycles
with bus discharge OFF		 10 sec minimum To prevent overloading the soft start circuitry

Amplifier Internal Regeneration Absorption Capacity

The following table shows the Amplifier power, internal shunt resistor specifications, regenerative power absorption capacity and maximum duration. These values are based on a 200VAC main power supply.

Model CK3A-G305L CK3A-G310L CK3A-G320L
Rated RMS power [W] 1195 W 2390 W 4400 W
Internal shunt resistor specification 25 Ω 30 W 17 Ω 80 W
Built-in capacitors absorption energy [J] 46 J 62 J
Internal shunt resistor average regeneration energy [W] 18 W 32 W
Maximum duration of continuous regeneration [sec] 2 sec 2 sec
Minimum allowable shunt resistance [Ω] 20 Ω 15 Ω 15 Ω

last update: April 1, 2025

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