ATS-US Series Auto Transfer Transformer
Product Information
The ATS-US (Auto Transfer Transformer) is a device that controls
the switch of the contactors to provide power to the critical load
stated as EPS (Emergency Power Supply) load in both grid-tied and
off-grid conditions. It operates with PCS inverter for the purpose
of providing split-phase power when the grid goes off unexpectedly.
The device comes with a transformer that can transform 240V to
120/240V split phase to provide power to the critical load.
Location in the System
The input side of ATS-US is connected with EPS output of hybrid
inverter and grid, and the output side is connected with critical
load stated as EPS load.
Configuration
ATS-US is connected to various components in the system,
including PV Array, Hybrid Inverter, Battery, RSD1 ATSE, EPS Grid
Breaker, DC Breaker, AC Breaker, Load, Electrical Grid, Sensor, AC
Breaker, Auto transformer, and EPS Load. The device is
wall-mountable and comes with fixing screws, anchor bolts, and a
user manual.
General Information – Parts List
- Model name: ATS-US
- Grid Rated Voltage: 240V
- Grid Rated Frequency: 50/60Hz
- Grid Rated Current: 21 a.c.Aa, 48 a.c.Ab
- EPS Rated Voltage: 240V
- EPS Rated Frequency: 50/60Hz
- EPS Rated Current: 21 a.c.Aa, 48 a.c.Ab
- Load Rated Voltage: 120/240V
- Load Rated Current: 21 a.c.Aa, 48 a.c.Ab
- Load Rated Power(L-L): 5000VAa, 11400VAb
- Load Rated Balanced Power(L-N): 5000VAa, 11400VAb
- Load Rated Unbalanced Power(L-N): 3000W
- Cooling Concept: Natural
- Ingress Protection: IP65/NEMA type 4X
- Size: 480*275*105mm/18.9*10.8*4.1in
- Weight: 15.6KG/34.3lb
Product Usage Instructions
Wall Mount Installation
- Reserve the space of 300mm (11.81in) from ATS-US.
- Place the wall bracket horizontally on the wall and mark the
position of 3 holes for screws. - Remove the wall mount and drill 3 holes were marked, Drill
holes with 10 drill Depth: at least 40mm (1.575in). - First knock expansion pipe into the hole with Rubber hammer and
then place the wall bracket align with the marked position on the
wall. Last, screw the self-tapping screwing into the expansion
pipe. - Tighten the screws on both sides of the wall bracket.
Wiring Connection
Before installation, the following cables are needed:
- Cables that can withstand EPS power
- Four single-core outdoor copper cables (L1, N, L2, PE)
- Cables that can withstand EPS output power
- Two single-core outdoor copper cables (L1 and L2)
The wiring connection should be done as per the chart provided
in the user manual.
1. Introduction
ATS -US Series Quick Guide
The Auto Transfer Transformer (ATS-US) controls the switch of the contactors to provide power to the critical load stated as EPS Emergency Power Supply load in both grid-tied and off-grid conditions. There is a contactor in ATS-US to provide user a simple connection. ATS-US is operating with PCS inverter for the purpose of providing the split phase power when grid accidentally or unexpectedly goes off. This approach allows the home critical contunously to be supplied.
2. The location of ATS-US in the system
3. Configuration
PV Array
Hybrid Inverter
Battery
RSD1 ATSE
EPS Grid Breaker
DC Breaker
AC Breaker
Load
Electrical Grid
Sensor
AC Breaker
Auto transformer
EPS Load
As shown in chart 2.1, the input side of ATS-US is connected with EPS output of hybrid inverter and grid, the output side is connected with critical load stated as EPS load. EPS Load is set default to connect with Grid power.If Grid is lost, EPS Load will turn the switch to EPS output of hybrid inverter. And there is a transformer in ATS-US, it can transform 240V to 120/240V split phase to provide the power to critical load.
4. General Information – Parts List
Model name
ATS-US
Grid Rated Voltage
240V
Grid Rated Frequency Grid Rated Current
50 /60Hz 21 a.c.Aa,48 a.c.Ab
EPS Rated Voltage
240V
EPS Rated Frequency EPS Rated Current
50 /60Hz 21 a.c.Aa,48 a.c.Ab
Load Rated Voltage Load Rated Current Load Rated power(L-L) Load Rated balanced power(L-N)
120/240V 21 a.c.Aa,48 a.c.Ab 5000VAa,11400VAb 5000VAa,11400VAb
Load Rated unbalanced power(L-N)
3000W
Cooling Concept
Natural
Ingress Protection
IP65/NEMA type 4X
Installation
Wall Mountable
Operation Ambient Temperature Weight
-25~+50(-13 to+122°F) 15.6kg/34.3lb
Size
480*275*105mm/18.9*10.8*4.1in
Aboveaa:ATS A5T0S005T0-U00ST,b-U:AST,Sb114A0T0ST-1U1S400T-US
5. Dimension & Weight
Part List
Item Item Name
Qty Item Item Name
Qty
ATS-US (Auto
A
Transfer
1
Transformer
E Fixing screws
2
B
User Manual
1
/
/
/
C
Anchor Bolt
3
/
/
/
D
Key
2
/
/
/
Dimension (L x W x H): 480*275*105mm/18.9*10.8*4.1in Weight: 15.6KG/34.3lb
6. Tools 7. Wall Mount Installation
(A)
(B)
(E)
8. Open the ATS-US
NO.
Description
1
Press terminal connector
2
Screw driver
3
Knock explosion bolt
4
Drill holes on the wall
(C)
(D)
a. Please reserve the space of 300mm (11.81in) from ATS-US. b. Place the wall bracket horizontally on the wall and mark the
position of 3 holes for screws. c. Remove the wall mount and drill 3 holes were marked, Drill
holes with 10 drill Depth: at least 40mm (1.575in). d. First knock expansion pipe into the hole with Rubber
hammer and then place the wall bracket align with the marked position on the wall. Last, screw the self-tapping screwing into the expansion pipe. e. Tighten the screws on both sides of the wall bracket.
As shown above, please put the key into the Keyhole on the ATSUS top right and bottom right and clockwise rotation to 90°.The cover can be opended. Rotate 90 ° counterclockwise to remove the key. The cover can be pressed directly to close the cover.
9. Wiring Connection
9.1 Wires Making
1. Wires below are needed before installation.
Cable description
a
Cable
Type
Conductor Crosssectional Area Range
8
b
1.Use cables that can withstand
AC GRID power 90°C (194°F) or 105°C (221°F).
L1, N, L2:106 AWG
cable
2.use four single-core outdoor
PE: 6 AWG
copper cables (L1, N, L2, PE).
a
1.Use cables that can withstand
8
b
EPS power cable
90°C (194°F) or 105°C (221°F). 2.Two single-core outdoor copper
126 AWG
cables (L1 and L2)
EPS output power cable
1.Use cables that can withstand 90°C (194°F) or 105°C (221°F). 2.use four single-core outdoor copper cables (L1, N, L2, PE).
L1, N, L2:106 AWG PE: 6 AWG
Pictureaabove AaT:ASTS5050000T0-UT-SU,bS,b:AATTSS11144000TT-U-USS
2. Use the diagonal plier to trip 15mm of insulation from one side of the 10AWG wires (7pcs). Use the diagonal plier to trip one side of GND wire about 7mm (3pcs).
Source
Purchased by customer
Purchased by customer
Purchased by customer
10AWGa 8AWGb
10AWGa 8AWGb
10AWGa 8AWGb
Picture above a:ATS 5000T-US,b:ATS 11400T-US 9.2 BACKUP Connection
a
b
1.Use the screwdriver to loosen screws in positions L1 and L2 at the contactor’s BACKUP inputs. 2.Insert L1 and L2 of the backup conductors into the BACKUP input terminals of L1 and L2. 3.Tighten to 2.5Nm. 4.Use the screwdriver to secure the backup EGC to the grounding bus bar.
9.3 GRID Connection
a
b
1. Use the screwdriver to loosen screws in positions L1 and L2 at the contactor’s GRID inputs. 2. Insert L1 and L2 of the GRID conductors in to the GRID input terminals of L1 and L2. 3. Tighten to 2.5Nm. 4. Use screwdriver to secure the GRID EGC to the grounding bus bar.
9.4 LOAD Connecrion
a
b
1. Use the screwdriver to loosen the three screws on the LOAD terminals. 2. Insert L1, L2, and N of the LOAD conductors in to the L1 ,L2, and LOAD terminals. 3. Tighten to 3.5Nm. 4. Use screwdriver to secure the LOAD EGC to the grounding bus bar.
Picture above a:ATS 5000T-US,b:ATS 11400T-US
10. ATS-US usage methods
9.5 Checking Please make sure that all wiring in the ATS-US is tightened.
After connecting the ATS-US internal wire, close the cover and the GRID and EPS end of the ATS-US are respectively connected with the AC GRID and EPS output of inverter, EPS load end access load. Run the system, loaded into normal operation.
11. Trouble shooting
1. In the process of use, if EPS load does not work in on-grid condition, please turn off the inverter and turn off the switch of grid input. Then open the ATS-US cover, check the GRID and EPS LOAD line is connected properly.
2. If there is no power in load in off-grid condition, please turn off the inverter and open the ATS-US cover, check the control line, the EPS wiring and the EPS LOAD wiring is properly.
12. Caution
1. Please use the equipment within the scope of specification. Excessive current or voltage may cause device damage.
2. To avoid personal injury due to energy hazard, remove wristwatches and jewelry when repairing. Use tools with insulated handles.
3.The rated power of secondary side L1-N and L2-N could up to 5KVA respectively,and power difference between the tow split phases can not
exceed 3KW.
4.Don’t connect N of ATS together with N of grid.
5.Don’t connect N of ATS to PE of ATS or PE of grid.
6. Repair is to be performed only by qualified technical personal authorized by manufacturer.
The rated balanced power(L-N)means the Load of L1-N and L2-N is equal. The rated unbalanced power(L-N)means the load of L1-N and L2-N is different.
Download Manual
Growatt New Energy
GR-UM-198-A-06
