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| Replacement Board |
Replacement Keypad |
Installation Instructions |
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Page last updated Sep 26, 2024 @ 03:40pm
K473670
AK473670-01
AK473670-03
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| Replacement Board |
Replacement Keypad |
Installation Instructions |
| Click thumbnail image above to enlarge | ||
Aftermarket ASCO 300 Series Controller
for ASCO Automatic Transfer Switch
208V, 220V, 240V, 480V
(with optional replacement keypad and
ribbon cable)
CONTROLLER DESCRIPTION
Our new aftermarket ASCO 300 Series Group 1 controller is the highest quality and most cost-effective replacement option for the ASCO 300 Series transfer switch controllers K473670-002 (208V), K473670-003 (240V), K473670-006 (480V), and K473670-008 (220V). Our aftermarket controller supports all of the features of the original ASCO controller and much more. Diagnostic LEDs have been added to help in system troubleshooting. We have integrated a fail-safe feature that protects the controller from damage, even in the event that the transfer switch mechanism is stuck or jammed and cannot move. This is a major cause of failure on the OEM original.
Three phase voltage sensing is all solid-state, eliminating the need for voltage-sensing transformers. Improved surge and lightning protection combined with heavy-duty power transformers and a high-efficiency switching power supply work together for enhanced reliability. Feature selection is done with plainly-marked DIP switches. Connection to the communications port has been simplified by eliminating the need for the ASCO 72A Communications Module and implementing a standard RS-485 port. The ASCObus II communications protocol is supported, as well as the local and remote annunciators. The controller PCB assembly mounts directly into the original tray using the original hardware and cover. Made in USA
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FEATURES
Exact drop-in replacement for the ASCO 300 Series Group 1 controller PC Board
On-board diagnostic LEDs to expedite system troubleshooting
Our fail-safe design prevents controller damage if transfer switch contacts fail to move
Improved surge and lightning protection
Solid-state voltage sensing -- not voltage sensing transformers that can deteriorate over time
Interchangeable heavy-duty power transformers
High-efficiency switching power supply
Simplified DIP-switch feature selection
Standard RS-485 full duplex communications port with screw terminal connections
ASCObus II communications protocol supported
ASCO local and remote annunciators supported
ASCO 72A Communications Module is not needed
Uses your existing ASCO cover, tray and hardware
Replacements available for the K473670-002 (208V), K473670-003 (240V), K473670-006 (480V), and K473670-008 (220V) controllers
TROUBLESHOOTING ASCO® 300 SERIES (GROUP 1) SWITCH
Checks for servicing transfer switches that can lead to re-occurring damage or inhibit proper function.
Corroded membrane on display, ribbon cable condition
Always check the condition of your membrane display panels for any corrosion!
ANY visible sign of corrosion (green to grayish build-up) around the ribbon cable or the ribbon cable connection can put an excess power draw on the power supply, of the controller. This can eventually lead to the internal over current protection of the controller, kicking in, and shutting the unit down. This will cause a no light, or dim / flashing situation with a constant run signal.
If you suspect the membrane, try powering down the unit, letting it sit for a minute, and connect a spare membrane display and separate ribbon cable, if available. If a spare isn’t available, you can test the control without it. You will loose your indicators but it will perform: engine start, transfer, retransfer, and run the 5 minute cooldown.
Shorted bridge rectifier and transfer solenoid
A common failure of Solenoid style transfer switches is a shorted bridge rectifier or transfer solenoid. Most often the bridge rectifier is the only component shorted, but sometimes the solenoid is shorted or burnt up, especially if the switch hangs between transfers. This in turn will also take out the rectifier. In these instances reoccurring damage can occur to a repaired control if the rectifier and solenoid aren’t tested, to see if they are shorted.
A major sign of a bad rectifier is burned circuit traces right below the SE and ER relays. If there is doubt, always replace the rectifier to be safe. We suggest a rectifier rated for 25 Amps and 1000 peak reverse Voltage. Solenoid resistance should be checked. Resistances will vary per system voltage but shouldn’t be lower than 20 ohms.
After thoroughly troubleshooting the switch place the order for the controller below.
Return Policy: This item may be returned within 30 days of the original purchase date. Refund/credit issued will be subject to a 25% per item restocking/re-test fee as long as unit is in new, undamaged condition. Shipping charges are not refundable.
Aftermarket control board Keypad
Item Number: K473670
Price: $865
Price last updated 6/8/2024
Shipping Weight: 5 lbs.
This item normally ships in approximately 1 week or less.
Item Number: AK473670-01
Price: $259
Price last updated 6/8/2024
Shipping Weight: 2 lbs.
This item normally ships in approximately 1 week or less.
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