Page last updated Jun 22, 2022 @ 02:55pm
PRELIMINARY INFORMATION SUBJECT TO CHANGE
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Automatic Transfer Switches
240 Vac 1 or 3 phase
(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.
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.
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-60
When the NATS22A is used as a replacement for the MX-50 or MX-60 controllers on an existing ZTX switch a summary of the installation steps would be as follows. Supplementary instructions are 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 normally be provided: control wire, butt splices, ties, fuses.
mark the nine control wires at the harness interconnect plug at the existing MX controller board
cut the plug off the harness
trace two of those wires back to the position limit switches on the power contactor and disconnect them
locate two specific Form-C coil clearing limit switches and verify their polarities
reconnect the two wires from step 3 to these two limit switches
select a location for the new controller (usually on front cover), make the cutout and mount the controller
extend the length of the 8-conductor wire harness to the new controller using additional wire and butt splices
terminate the wire harness at the controller and add the necessary wire jumpers
connect the engine start wires
make any programming changes and test the system
mark the old MX touch-pad as non-functional or obscure it with a cover
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.
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
NOTE: "feature not available" means the OEM controller did NOT have this capability and that the NATS22A is an upgrade
Range Factory Setting GE Zenith ZTX
1 1 phase or 3 phase system 00 (1 ph) or 01 (3 ph) 01 (3 ph) none (fixed by model) none (fixed by model) 2 ATS control type 00 to 06 00 none (ZTX series only) none (Vigilant series only) 3 TDEN Time Delay Emergency to Normal 00-999 sec 10 sec 300 sec 0-256 sec (10 sec) 4 TDNE Time Delay Normal to Emergency 00-250 sec 10 sec 20 sec (some 5 sec) 0-64 sec (10 sec) 5 TDES Time Delay Engine Start 00-30 sec 5 sec 5 sec (some 3 sec) 0-32 sec (10 sec) 6 TDEC Time Delay Engine Cool down 00-250 sec 30 sec 60 sec 0-256 sec (256 sec) 7 Time Delay in the OFF Position 00-99 sec 5 sec feature not available feature not available 8 Normal Source Over Voltage Protection 11-53 (110-530V) 25 (250V) feature not available 111-118%DO
9 Normal Source Under Voltage Protection 08-47 (80-470V) 18 (180V) 80%DO
10 Normal Source Voltage Time Delay 00-99 sec 10 sec 3 sec 11 Normal Source Over Frequency Protection 51-75 Hz 65 Hz feature not available 105-112% 12 Normal Source Under Frequency Protection 40-59 Hz 55 Hz feature not available 88-95% (88%) 13 Normal Source Frequency Time Delay 00-99 sec 10 sec feature not available 14 Generator Source Over Voltage Protection 11-53 (110-530V) 25 (250V) feature not available 111-118%DO
15 Generator Source Under Voltage Protection 08-47 (80-470V) 18 (180V) 90%PU 82-89%DO (82%)
16 Generator Source Voltage Time Delay 00-99 sec 10 sec feature not available feature not available 17 Generator Source Over Frequency Protection 51-75 Hz 65 Hz feature not available feature not available 18 Generator Source Under Frequency Protection 40-59 Hz 55 Hz 95%PU feature not available 19 Generator Source Frequency Time Delay 00-99 sec 10 sec feature not available feature not available 20 Set Day of Week 1-7 (Mon-Sun) current feature not available user sets 21 Set Hour 00-23 current feature not available user sets 22 Set Minutes 00-59 current feature not available user sets 23 Set Generator Exercise - day 1-7 (Mon-Sun) 6 user sets user sets 24 Set Generator Exercise - start hour 00-23 12 user sets user sets 25 Set Generator Exercise - repeat 01 (weekly)
03 (every 3 wks)
04 (every 4 wks)
01 user sets user sets 26 Set Generator Exercise - duration 00-99 min 00 (off) user sets user sets 27 Set Generator Exercise - load or no load 00 (no load), 01 (load) 00 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 30 Program Aux Contact Output - 4 choices 00 transfer failure
03 ATS in emerg pos
01 pre-transfer feature not available feature not available 31 Pre-transfer/Pre-exercise time delay 00-99 sec 10 sec feature not available feature not available 32 Remote Control 00 disable, 01 enable 00 feature not available feature not available 33 Remote Control - address 00 feature not available feature not available 34 Remote Control - data rate 03 feature not available feature not available 35 AC Voltage Correction 00 no, 01 yes 00 feature not available feature not available 36 Restore Remote Connection Passwords 00 no, 01 yes 00 feature not available feature not available
PRELIMINARY INFORMATION SUBJECT TO CHANGE
Item Number: NATS22A
Price last updated 6/21/2022
Shipping Weight: 4 lbs.
This item normally ships in approximately 2 weeks or less.
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