T. J. Snow > Supplies > Miyachi > Mid-Frequency Inverters

Compact Frequency Inverters

Delivers stronger bimetal welds and longer electrode life with less part deformation.

Note: This page details the Mid frequency inverters. Also see the IP-200 high frequency inverter.

How Frequency Inverter Power Supplies Work
Three Phase, fully rectified DC current is repeatedly switched on and OFF by the semiconductor switches S1 S2, producing AC current (greater than 1 kHz). This current flows the welding transformer Tw, and the current I is rectified on the transformer secondary side and flows to the head H. The weld current is easily controlled and response is rapid because both the efficiency and power factors are excellent. Furthermore, because of the transformer's small size, these power supplies are prefect for inclusion in automated systems.
How Freqency Inverter Power Supplies Work
Quality Assurance with Secondary Constant Current Control
Variations in resistance during welding are detected and fed back to the control unit. A frequency inverter circuit is used to maintain fixed power during welding (Power = Voltage x Current). The advantage of this type of control is that reliable welds can be achieved regardless of fluctuations in power source voltage or non-uniform workpiece resistance. Even with shunting or worn electrodes, quality welds with no splash and constant strength can be obtained even at lower pressures.

Freqency Inverter Power Graph

Frequency Inverter Features:

Reliable nugget formation and improved weld quality with no splash closed loop feedback control.
Built in monitoring capability
High Speed, suitable for automated systems (more than 5 welds per second).
4 channel transformer selector keeps costs down (IP-215A, IP-217A)

Lower Costs with Sequential Welding

MA-600A weld transformer selector --

(for use only with the IP-215A and IP-217A).

Features:

Simultaneous squeeze and sequential welding

One frequency inverter power supply can be used with up to 4 weld transformers.

Weld schedules can be set individually for each weld
Random initiation is possible with the optional MIS-0104 PLC

IS-217A
IP-217A
IP-215A

Select the Power Supply and Transformer Suited for your Welding Needs:

Power Supply -- Transformer Pairings

Transformers
(below) Frequency Inverter
Power Supplies Suggested Applications

IP-215A IP-217A IS-217A

IT-500A XX XX electron guns, miniature relays

IT-501 XX XX lamps (tungsten filament), battery tabs

IT-510A XX XX precious metal accessories, tape heads

IT-511A XX XX bimetal contacts (nickel, brass, copper, etc.)

IT-512A XX XX* coil fusing, TV tube masks

IT-530A XX* electrolytic capacitor terminals, eyeglass frames

* Seam Welding available with options

**Power Supply -- Transformer Pairings**
Transformers (below)	Frequency Inverter Power Supplies	Suggested Applications
IP-215A	IP-217A	IS-217A
IT-500A	XX	XX		electron guns, miniature relays
IT-501	XX	XX		lamps (tungsten filament), battery tabs
IT-510A		XX	XX	precious metal accessories, tape heads
IT-511A		XX	XX	bimetal contacts (nickel, brass, copper, etc.)
IT-512A		XX	XX*	coil fusing, TV tube masks
IT-530A			XX*	electrolytic capacitor terminals, eyeglass frames

For more general information about the transformers and power supplies, in addition ot the tables below, there is another table comparing all the power supplies and transformers available.

**Power Supply Specifications**
Model		IP-215A	IP-217A	IS-217A
Power Source:		220 VAC +/-10% 3-Phase 50/60 Hz
Control Frequency:		2 kHz		1 kHz
Maximum Output Current:		50 A	200A
Control Method:		Constant Current, Constant Power, Constant Voltage		Constant Current, Constant Power
Weld Schedules:		7 Schedules		15 Schedules
Timer Settings:	Squeeze Delay			0-->9999 ms / 0-->999
	Rise 1, 2	0-->49 ms		0-->400 ms / 0-->20
	Weld 1, 2	0-->99 ms		0-->600 ms / 0-->36
	Cool	0-->99 ms		0-->999 ms / 0-->99
	Fall			0-->49 ms / 0-->9
	Hold, Off			0-->999 ms / 0-->999
	Pulsation			9
Heat Settings:	Heat 1 Heat 2	0.20--2.00 KA 0.20--2.00 V 0.04--4.00 KW	0.40--4.00 KA 0.40--4.00 V 0.16--9.99 KW	0.40--5.00 KA 0.20--5.00 KW
Current Monitor:		0--9.99 KA		+/-0-->99%
Voltage Monitor:		0--99.9 V		(Display Only)
Power Monitor:		0--9.99 KW		+/-0-->99%
Weight:		22 lbs. 10 kg	28.6 lbs 13 kg	28.6 lbs 13 kg
External Dimensions: (W x H x D)		5.6 x 10.6 x 17.2 inches 142 x 269 x 436 mm	6.8 x 10.6 x 18.3 inches 172 x 269 x 466 mm	6.8 x 10.6 x 18.3 inches 172 x 269 x 466 mm

Transformer Specifications
Model IT-500A IT-501A IT-510A IT-511A IT-512A IT-530A

Rated Capacity: 5 kVA 4.5 kVA 9 kVA 7.9 kVA 15.0 kVA 17.2 kVA

Maximum Input Voltage: 300V

Input Frequency: 2 kHz 1 kHz

Secondary Voltage
without load: 6.25 V 8.1 V 6.5 V 8.57 V 12/10 V 9.37 V

Maximum Current:* 2000 A 1500 A 4000 A 3000 A 4000 A 5000 A**

Duty Rate: 8% 7% 6% 5% 5% 7%

Cooling: -- Air Cooled -- Water Cooled
1.5 gal./min
(6 L/min)

Weight: 14.3 lbs.
6.5 kg 15.4 lbs.
7 kg 28.6 lbs.
13 kg 30.9 lbs.
14 kg 41.9 lbs.
19 kg 33.1 lbs.
15 kg

External Dimensions:
(W x H x D) 5.4 x 6.9 x 11 in.
138 x 176 x 280 mm 5.4 x 6.9 x 11.6 in
138 x 176 x 295 mm 7.2 x 7.2 x 13.4 in
183 x 184 x 340 mm 7.2 x 7.2 x 14.2 in
183 x 184 x 360 mm 7.2 x 7.2 x 16.1 in
183 x 184 x 410 mm 6.1 x 4.1 x 11.8 in
155 x 105 x 300 mm

* The Maximum current depends on the Rectifying diode specifications
** With a 15 cycle weld time

**Transformer Specifications**
Model	IT-500A	IT-501A	IT-510A	IT-511A	IT-512A	IT-530A
Rated Capacity:	5 kVA	4.5 kVA	9 kVA	7.9 kVA	15.0 kVA	17.2 kVA
Maximum Input Voltage:	300V
Input Frequency:	2 kHz	1 kHz
Secondary Voltage without load:	6.25 V	8.1 V	6.5 V	8.57 V	12/10 V	9.37 V
Maximum Current:*	2000 A	1500 A	4000 A	3000 A	4000 A	5000 A**
Duty Rate:	8%	7%	6%	5%	5%	7%
Cooling:	-- Air Cooled --	Water Cooled 1.5 gal./min (6 L/min)
Weight:	14.3 lbs. 6.5 kg	15.4 lbs. 7 kg	28.6 lbs. 13 kg	30.9 lbs. 14 kg	41.9 lbs. 19 kg	33.1 lbs. 15 kg
External Dimensions: (W x H x D)	5.4 x 6.9 x 11 in. 138 x 176 x 280 mm	5.4 x 6.9 x 11.6 in 138 x 176 x 295 mm	7.2 x 7.2 x 13.4 in 183 x 184 x 340 mm	7.2 x 7.2 x 14.2 in 183 x 184 x 360 mm	7.2 x 7.2 x 16.1 in 183 x 184 x 410 mm	6.1 x 4.1 x 11.8 in 155 x 105 x 300 mm

For more information, or help selecting or pricing a Microwelder system, feel free to contact T. J. Snow.

For help selecting a system you may wish look at:

Fine Spot Heads
4 kHz High Frequency Inverter Power Supply
Power Supply - Transformer Table
All Miyachi Products

Contact
Information: 6207 Jim Snow Way
P. O. Box 22847
Chattanooga, TN 37422 (423) 894-6234
1-800-NOW-SNOW
FAX (423) 892-3889
ORDER FAX (423) 490-2417

welders@tjsnow.com

Contact Information:	6207 Jim Snow Way P. O. Box 22847 Chattanooga, TN 37422	(423) 894-6234 1-800-NOW-SNOW FAX (423) 892-3889 ORDER FAX (423) 490-2417
	welders@tjsnow.com