NATS22A

        
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Universal Controller for
Automatic Transfer Switches
240 Vac 1 or 3 phase
other Voltages available
(field installable and programmable)

An Automatic Transfer Switch (ATS) transfers critical electrical loads from the normal utility (grid) source to a standby generator backup source. When the grid is restored it automatically switches the load back. The controller is the "brains" that performs and the monitoring of the two sources, the starting and stopping of the standby generator and the transfer control.

The NATS22A is a multi-function programmable logic automatic transfer switch controller. It is suitable for single and 3 phase systems and includes all necessary monitoring and protections. It works with most transfer switches in existence, including the recently discontinued GE Zenith MX-60 controller. Unlike some other controllers, the NATS22A does not require 12 Vdc control power and therefore an extra wire pair from the engine starting battery is NOT required. But 12Vdc control power can be connected if you want the controller to remain live when both ac sources are dead, such as when utility power is lost and the generator has not yet started. 

Now you do not have to replace a perfectly good transfer switch simply because the original manufacturer will no longer sell a replacement for a non-working controller. Or, consider upgrading to the NATS22A if the lead time for an original replacement is unacceptably long.

FEATURES

Micro-processor based Polycarbonate front panel Membrane keypad design Compact size with user-friendly 7 segment LED display Direct operation on front panel with program settings auto-saved in non-volatile RAM Full phase voltage/frequency monitor & protection for Normal & Standby sources

Transfer fail alarm, Pre-exerciser or Pre-transfer signal contact output Built-in 1 to 4 weeks generator exerciser Built-in noise filter for Normal & Standby sources real time clock with internal battery backup 12 Vdc control power is NOT required for this controller as it is powered directly from the two AC sources

AS REPLACEMENT FOR GE ZENITH MX-50 AND MX-60 CONTROLLERS

When the NATS22A is used as a replacement for the MX-50 (50P-2000) or MX-60 (P/N 50P-3000) controllers on an existing ZTX switch a summary of the installation steps would be as listed below. Switch specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders. The NATS22A controller is considered an upgrade as compared to the MX-60 due to the additional sensing and adjustments available. However, the NATS22A does not have the R50 in-phase monitor capability used on 3-phase systems.

1. select a location for the new controller (usually on front cover), make the cutout and mount the controller

2. mount 4 new fuse holders and run 4 wires to new controller

3. connect 2 wires from MX interconnect plug to new controller

4. change wire connections to 2 position limit switches and run 4 wires to the new controller

5. detach interconnect plug from old MX controller

6. add 2 wire jumpers on new controller

7. connect the engine start wires

8. make any programming changes and test the system

9. mark the old MX touch-pad as non-functional or obscure it with a cover

Note that GE Zenith also manufactured the same ZTX switch and brand labeled it for Coleman Powermate for use with the Powerstation generator. GE Zenith also manufactured the same ZTX switch and brand labeled it for Cummins Onan as model series RSZ. The replacement NATS22A controller works equally well for these switches.

AS REPLACEMENT FOR EATON CUTLER-HAMMER ATC-100 CONTROLLER

When the NATS22A is used as a replacement for the Eaton Cutler-Hammer ATC-100 (P/N 8160A00G24) controller on an existing RLC1 or ATC1 switch the wiring changes are relatively simple. This is because most of the necessary control connections are available right at the back of the existing ATC-100 controller. Switch specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders.  The NATS22A controller is considered an upgrade as compared to the ATC-100 due to the additional sensing and adjustments available. However, the NATS22A does not have the in-phase transition capability for 3-phase systems.

AS REPLACEMENT FOR GE ZENITH MX-150 CONTROLLER

When the NATS22A is used as a replacement for the MX-150 (P/N 50P-1160RPL) controller on an existing ZTG switch the existing RT or CPS control power supply box is not used. Some advanced features available in the MX-150 are not replicated in the NATS22A. If the user requires any of these features this replacement controller may not be suitable for the application.

sensing calibration for frequency DS Disconnect Switch, Auto/Inhibit EL/P Event Log & System Data Q2 Peak Shave / Remote Load Test Input R50 In Phase Monitor S13 Transfer Commit

YEN Bypass Timers Key * VI Voltage Imbalance (Three Phase) MEXEG Option Package T3/W3 Elevator Pre-Signal Auxiliary Contacts ** UMD Universal Motor Load Disconnect Circuit ** ZNET Network Communications Interface Card ***     * might be able to duplicate with ATS22A test button   ** might be able to duplicate with ATS22A programmable output contact *** NATS22A has other communication options

Switch specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders.

AS REPLACEMENT FOR EATON CUTLER-HAMMER ATC-300 CONTROLLER

When the NATS22A is used as a replacement for the ATC-300 (P/N 6D32360G-- 8160A00G--) controller on an existing contactor-based switch, or breaker-based switch with a motor operator the existing multi-tap transformer is not used. Some advanced features available in the ATC-300 are not replicated in the NATS22A. If the user requires any of these features this replacement controller may not be suitable for the application.

Lockout and monitor modes In-phase transition Event log

Peak shaving / go to emergency Phase reversal sensing (three phase) Voltage imbalance sensing

Switch specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders.

AS REPLACEMENT FOR DYNAGEN CONTROLLER

When the NATS22A is used as a replacement for the Dynagen controller on an existing Vigilant or ProTechtor switch, specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders.  The NATS22A controller is considered an upgrade as compared to the ATC-100 due to the additional sensing and adjustments available.

AS REPLACEMENT FOR EATON CUTLER-HAMMER RTC-100 CONTROLLER

When the NATS22A is used as a replacement for the Eaton Cutler-Hammer RTC-100 controller on an existing "Green" EGS series switch the wiring changes are relatively simple. Switch specific step-by-step instructions can be provided with order to aid in identifying the wires and making the changes. If the controller is ordered with installation kit the following items will also normally be provided: control wire, butt splices and/or wire tap connectors, push-on connectors, wire ties, fuses and fuse holders.  The NATS22A controller is considered an upgrade as compared to the ATC-100 due to the additional sensing and adjustments available. However, the NATS22A does NOT have the load control capability that is part of the RTC-100 controller. If load control IS being used to prevent potential overloading of the standby generator then the NATS22A probably is not a suitable replacement.

AS REPLACEMENT FOR OTHER CONTROLLERS

When the NATS22A is used as a replacement for other types of controllers a control wiring diagram is needed for the switch. This can sometimes be found in the original manufacturer's instruction manual for the switch or it may be pasted inside the cover. If it is not available then it will have to be created by manually tracing the wiring. The number and operating Voltage of the coils or solenoids must also be known. With this information in-hand it is usually possible incorporate the NATS22A into the switch.

NATS22A SPECIFICATIONS

	Description	Value
1	AC Voltage Input Range	50-280 Vac  50/60 Hz
2	AC Voltage Display Range	50-280 Vac  50/60 Hz
3	Frequency Measurement Range	40-75 Hz
4	Remote Start Contact Rating	7 A @ 250 Vac max
5	Normal Source ON Contact Rating	7 A @ 250 Vac max
6	Emergency Source ON Contact Rating	7 A @ 250 Vac max
7	Auxiliary Output Contact Rating	7 A @ 250 Vac max
8	Operating Temperature	-20 to +70 C
9	Relative Humidity	90% max
10	Dimensions	4.92"W x 7.09"H x 2.01"D overall
11	Panel Cutout	4.45" x 6.61"
12	Weight	1.96 lbs

 

PROGRAMMABLE SETTINGS

Prog Line	Description	NATS22A Range	NATS22A Default Setting	GE Zenith ZTX MX-60 Setting	Eaton Cutler-Hammer ATC-100	Dynagen Vigilant Controller Setting
1	1 phase or 3 phase system	00 (1 ph) or 01 (3 ph)	01 (3 ph)	none (fixed by model)	1 or 3	none (fixed by model)
2	ATS control type	00 to 06	00	none (ZTX series only)	feature not available	none (Vigilant series only)
3	TDEN Time Delay Emergency to Normal	00-999 sec	10 sec	300 sec	5 min fixed	0-256 sec (10 sec)
4	TDNE Time Delay Normal to Emergency	00-250 sec	10 sec	20 sec (some 5 sec)	2 or 15 sec	0-64 sec (10 sec)
5	TDES Time Delay Engine Start	00-30 sec	5 sec	5 sec (some 3 sec)	3 sec fixed	0-32 sec (10 sec)
6	TDEC Time Delay Engine Cool down	00-250 sec	30 sec	60 sec	1 min fixed	0-256 sec (256 sec)
7	Time Delay in the OFF Position (delayed transition)	00-99 sec	5 sec	feature not available	0 or 2 sec	feature not available
8	Normal Source Over Voltage Protection (Note 2)	21-29 (210-290V)	25 (250V)	feature not available	feature not available	111-118%DO 106-113%PU
9	Normal Source Under Voltage Protection (Note 2)	16-23 (160-230V)	18 (180V)	80%DO 90%PU	80% DO 90% PU	82-89%DO (82%) 87-94%PU (87%)
10	Normal Source Voltage Time Delay	00-99 sec	10 sec	3 sec	not defined	not defined
11	Normal Source Over Frequency Protection	51-75 Hz	65 Hz	feature not available	feature not available	105-112%
12	Normal Source Under Frequency Protection	40-59 Hz	55 Hz	feature not available	feature not available	88-95% (88%)
13	Normal Source Frequency Time Delay	00-99 sec	10 sec	feature not available	feature not available	not defined
14	Generator Source Over Voltage Protection (Note 2)	21-29 (210-290V)	25 (250V)	feature not available	feature not available	111-118%DO 106-113%PU
15	Generator Source Under Voltage Protection (Note 2)	16-23 (160-230V)	18 (180V)	90%PU	80% DO 90% PU	82-89%DO (82%) 87-94%PU (87%)
16	Generator Source Voltage Time Delay	00-99 sec	10 sec	feature not available	6 sec fixed	feature not available
17	Generator Source Over Frequency Protection	51-75 Hz	65 Hz	feature not available	115% DO 110% PU	feature not available
18	Generator Source Under Frequency Protection	40-59 Hz	55 Hz	95%PU	90% DO 95% PU	feature not available
19	Generator Source Frequency Time Delay	00-99 sec	10 sec	feature not available	6 sec fixed	feature not available
20	Set Day of Week	1-7 (Mon-Sun)	current	feature not available	feature not available	user sets
21	Set Hour	00-23	current	feature not available	feature not available	user sets
22	Set Minutes	00-59	current	feature not available	feature not available	user sets
23	Set Generator Exercise - day	1-7 (Mon-Sun)	6	user sets	user sets	user sets
24	Set Generator Exercise - start hour	00-23	12	user sets	user sets	user sets
25	Set Generator Exercise - repeat	01 (weekly) 02 (bi-weekly)  03 (every 3 wks) 04 (every 4 wks)	01	user sets	7, 14 or 28 days	user sets
26	Set Generator Exercise - duration	00-99 min	00 (off)	user sets	15 min fixed	user sets
27	Set Generator Exercise - load or no load	00 (no load) 01 (load)	00	user sets	user sets	user sets
28	Test with or without load	00 (no load) 01 (load)	01
29	Display setting	00 (cyclic) 01 (fixed)	00	feature not available	feature not available	feature not available
30	Program Aux Contact Output - 4 choices	00 transfer failure 01 pre-transfer 02 pre-exerciser 03 ATS in emerg pos	01 pre-transfer	feature not available	feature not available	feature not available
31	Pre-transfer/Pre-exercise time delay	00-99 sec	10 sec	feature not available	feature not available	feature not available
32	Remote Control	00 disable 01 enable	00	feature not available	feature not available	feature not available
33	Remote Control - address		00	feature not available	feature not available	feature not available
34	Remote Control - data rate		03	feature not available	feature not available	feature not available
35	AC Voltage Correction/calibration (3 phase)	00 no, 01 yes	00	feature not available	feature not available	feature not available
36	Restore Remote Connection Passwords	00 no, 01 yes	00	feature not available	feature not available	feature not available

NOTES:
1) "feature not available" means the OEM controller did NOT have this capability and that the NATS22A is an upgrade.
2) Other Voltage adjustment windows available within ranges of 110-530V for OV protection and 80-470V for UV protection.
3) Abbreviations: DO = drop out, unacceptable value; PU = pick up, acceptable value

If your switch is still under warranty we do not recommend replacing the OEM controller with this alternative as it will probably void the original manufacturer's switch warranty.

 

 

Select replacing... GE Zenith MX-50/MX-60 on ZTX Eaton ATC-100 on RLC1 switch GE Zenith MX-150 on ZTG switch. Some advanced features such as event log not replicated on NATS22A. (add $80) Eaton ATC-300 on ATC3C contactor switch. Some advanced features such as event log not replicated on NATS22A. Eaton ATC-300 on ATV3LDA motor operated switch. Some advanced features such as event log not replicated on NATS22A. Cutler Hammer ATC-200/250 on ATV2/ATH2 motor operated switch. Some advanced features such as event log not replicated on NATS22A. Thomson TSC9 on TS910 or TS920 switch. Load shedding not replicated in NATS22A. Thomson TSC900 on TS970 contactor switch. Some advanced features such as event log not replicated on NATS22A. Dynagen Vigilant switch Dynagen Protechtor switch replacing other type - describe in special instructions on checkout form
Select ATS Volts... 120/240V 1ph 120/208V 3ph (add $30) 240V 3ph (add $30) 120/240V 3ph (add $30) 277/480V 3ph, includes control power transformer (add $150) other Voltage - state in special instructions on checkout form (add $150)
Select ATS Amps... 40A switch 80A switch 100A switch 150A switch 200A switch 225A switch 240A switch 250A switch 300A switch 400A switch 600A switch 800A switch 1000A switch 1200A switch 1600A switch 2000A switch 2600A switch 3000A switch
Select wiring diagram... I have control wiring diagram I do NOT have control wiring diagram (state switch S/N or GO# in special instructions on checkout form)
Select install kit... include 240V max install kit with wire, splices, connectors, fuses, holders, ATS specific step by step instructions (add $100) include 600V max install kit with wire, splices, connectors, fuses, holders, ATS specific step by step instructions (add $200) do not include install kit parts or ats specific instructions

Item Number: NATS22A
Price: $539
Price last updated 8/25/2023
Shipping Weight: 3 lbs.
This item normally ships in approximately 2-3 weeks or less.

 

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