Photos show the actual item you will receive.
Product details
About this part
The Pacific Scientific 121-236 SC750 Servo Controller is made by Pacific Scientific and identified by manufacturer part number 121-236.
This listing is for the exact part number stated above. Compare the part number, condition and photos with your equipment before ordering.
Condition
This item is listed as Used. Previously used. See condition notes and photos.
The photos are part of the description — check them for labels, connectors, markings and any visible wear.
What's included
1 × Pacific Scientific 121-236 SC750 Servo Controller.
Only the items listed here or clearly shown in the photos are included. Cables, manuals, mounting hardware and accessories are not included unless stated.
Identification & compatibility
Check the manufacturer (Pacific Scientific), the part number (121-236) and the photos against your equipment. If you are not sure this is the right part, contact us before you order.
Price match
Found an identical item for less at a fixed price elsewhere? Contact us before you buy with the details, and we will review it.
Important information
Product information is based on what is available for this specific item. Where specifications or compatibility are critical to your application, confirm them before purchase.
- Brand
- Pacific Scientific
- Part number
- 121-236
- Model
- 121-236 REV B
- Series
- SC750 programmable digital brushless servocontroller
- Revision
- Rev. B
- Input
- 230 V AC, 3-phase, 50/60 Hz
- Full load current
- 29 A (29 FLA)
- Programming language
- ServoBASIC Plus
- Motor position input
- Resolver (J51)
- Encoder port
- J52 encoder out/in
- I/O
- J53–J56, I/O #1 to #4
- Power terminals
- J1 motor, J2 R/BUS, J3 AC power
The Pacific Scientific 121-236 is an SC750-series servo controller, a programmable digital controller for brushless servo motors from Pacific Scientific's Motor & Control Division. The nameplates read Model No. 121-236 Rev. B, input 230 V AC 3-phase, 29 FLA, 50/60 Hz. SC750 units are programmed in Pacific Scientific's ServoBASIC Plus language. Buyers also search for it as 121236 or SC 750.
What connections does the 121-236 have?
The front panel has a STATUS display, the J58 communications port, J51 resolver, J52 encoder out/in, and four I/O connectors (J53 to J56 for I/O #1 to #4) on pluggable green terminal blocks, plus J57. Power wiring sits under a clear cover: J1 motor, J2 R/BUS and J3 AC power.
Which machine did it come from?
One unit carries an earlier user's tag reading "Station #8, Coater #1, Spindle Control". The nameplates do not name the machine builder, so match the 121-236 Rev. B model number to your equipment parts list.
What condition is it in?
Used. The photos show two units with Rev. B nameplates, stainless front panels with light scratches, intact terminal blocks and the clear terminal cover in place.
- Ships from
- Israel
- Tracking
- Included on every order
Import duties and taxes may apply in your country and are paid by the buyer on delivery.
- Returns
- Not accepted
Return terms differ from item to item — this item's own policy is shown above.
Whatever it says, an item that arrives faulty or not as described is covered: tell us within 30 days of delivery and we will refund or replace it.
Consumers in the EU, the UK and Israel keep their legal right to cancel within 14 days. Full details and the return request form are on our Returns and warranty page.
Questions about this part
What is the Pacific Scientific 121-236?
An SC750-series programmable digital brushless servocontroller, model 121-236 Rev. B, for 230 V AC 3-phase input at 29 FLA.
What supply does the 121-236 need?
230 V AC, 3-phase, 50/60 Hz, per the nameplate, with 29 A full load current.
How is the SC750 programmed?
Pacific Scientific SC750 controllers are programmed in ServoBASIC Plus through the controller's communications port.
What motor position sensor does it use?
The front panel has a J51 resolver connector, plus J52 for encoder out/in.
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