CK3A-G305L / -G310L / -G320L

CK3A-series Direct PWM Amplifier

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

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
	*1-Phase DC 4**	F.L.A	6 A	-	19 A
Output	Rated Current		5 A_RMS	10 A_RMS	20 A_RMS
	Maximum (peak) Current		10 A_RMS	20 A_RMS	60 A_RMS
	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
Shunt Resistor	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

Product Category

Automation Systems
- Multi-Axis Controller
  - Programmable Multi-Axis Controller CK3M / CK5M Series
    - CK[]M-CPU1[]1
    - CK3W-AX[][][][][]
    - CK3W-PD048
    - CK3A-G305L / -G310L / -G320L

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