Cotek SR1000 User manual

PURE SINE WAVE INVERTER
SR1000 / SR1000T
User’s Manual
Telecom / Datacom

Table of Content
1. IMPORTANT SAFETY INSTRUCTIONS 1
1-1. General Safety Precautions 1
1-2. Other Safety Notes 1
1-3. Rack-Mounted Installation 2
2. FUNCTIONAL CHARACTERISTICS INTRODUCTION 3
2-1. System 3
2-2. Block Diagram 4
2-3. Electrical Performance 5
2-4. Mechanical Drawings 6
3. INSTALLATION AND MAINTENANCE 8
3-1. Rear Panel 8
3-2. Front Panel 14
3-3. Maintenance 14
4. OPERATION 15
4-1. Connecting the input power 15
4-2. Connecting the loads 15
4-3. Inverter Operation 15
4-4. Protections Features 15
5. FRONT LCD PANEL –DISPLAY & SETUP 16
5-1. LCD Panel Indications 16
5-2. Startup Sequence and Standby Status 17
5-3. Setup Menu –Operation and Instructions 18
6. RS-232 COMMUNICATION AND OPERATION 23
6-1. Operation of RS-232 Serial Port 23
6-2. Interface Commands 23
6-3. Example of the RS-232 Operation 24
7. INFORMATION 29
7-1. Troubleshooting 29
7-2. Warranty 29

1
1. Important Safety Instructions
WARNING!
SAVE THESE INSTRUCTIONS –This manual contains important
instructions that should be followed during installation and maintenance of
the inverter.
1-1. General Safety Precautions
1-1-1. Do not expose the inverter to rain, snow, spray or dust.
To reduce the risk of a fire hazard, do not cover or obstruct the ventilation
openings and do not install the inverter in a zero-clearance compartment.
1-1-2. To avoid the risk of fire and electric shock, make sure that the existing wiring
is in good electrical condition; and that the wire size is not undersized.
Do not operate the inverter with damaged or substandard wiring.
1-1-3. Depending on the use, the AC output of the inverter may require user installed
breaker or fuse. For telecom use, a GFCI has not been provided. The inverter
incorporates standard AC short circuit protection.
1-1-4. The following precautions should be taken when working on the inverter：
Remove watches, rings, or other metal objects.
Use tools with insulated handles.
Wear rubber gloves and boots.
1-1-5. If one of the following situations arises, get the equipment checked by service
personnel：
Liquid has penetrated into the equipment.
The equipment has been exposed to moisture.
The equipment does not work well or you cannot get it to work according to
the user manual.
The equipment has been dropped and damaged.
If the equipment has an obvious sign of breakage.
1-2. Other Safety Notes
1-2-1. Upon receipt, examine the shipment box for damage. Notify the carrier
immediately, before opening, if damage is evident.
1-2-2. Do not operate near water or in excessive humidity.
1-2-3. Do not open or disassemble the inverter, warranty may be voided.
1-2-4. The DC side connections should be firm and tight.
1-2-5. Grounding：Reliable grounding of rack-mounted equipment should be
maintained.

2
1-2-6. Do not drop a metal tool on the battery. The resulting spark or short circuit on
the battery or other electrical parts may cause an explosion.
1-2-7. Install the inverter in a well-ventilated area. Do not block the front air vents, or
the rear air exhausts of the unit.
1-2-8. Wiring：Adequate input power must be supplied to the inverter for proper use;
and correct wiring sizes must be ensured.
1-2-9. Mount the inverter such that the fan axis is horizontal.
1-2-10. Do not operate the inverter close to combustible gas or open fire.
1-2-11. Do not operate appliances that may feed power back into the inverter.
1-2-12. Temperature：The inverter should be operated in an ambient temperature
range of 0℃to 50℃, otherwise the output efficiency may be affected. Air
flow to the inverter must not be restricted.
1-3. Rack-Mounted Installation
Rack-Mounted Equipment –The unit is intended to be rack-mounted, and the
installation instructions should address the following concerns when the unit is
mounted in a rack system.
1-3-1. The equipment is to be installed in an environment where the maximum
ambient temperature must not exceed 50℃.
1-3-2. The openings on the enclosure are for air convection hence to protect the
equipment from overheating. DO NOT COVER THE OPENINGS.
1-3-3. Lay this equipment on a reliable surface when install. Dropping or falling could
cause injury.
1-3-4. The equipment shall be installed according to specification on the nameplate.
Ensure the voltage of the power source when connecting the equipment to the
power outlet. The current of the load and the output power of loads should not
exceed the specifications.
1-3-5. This equipment must be connected to reliable earthing before use.
1-3-6. "Equipment intended for installation in Restricted Access Location" and input
DC terminal at back of the rack to prevent qualified service personnel from
touching it.

3
2. Functional Characteristics Introduction
2-1. System
The unit is a highly reliable DC-AC inverter system, designed with advanced power
electronic and microprocessor technology offering the following features：
The inverter is equipped with a self diagnosis microprocessor that can identify
and display all failure messages on the LED/LCD display, accompanied by
visual/audio alarms.
1U height x 19” width x 13.6” depth, 19” rack mounting.
Pure sine wave output (THD < 2%) to operate high-end electronic equipment.
Built in 15A(120VAC) and 10A(250VAC) rated bypass relay.
Speeds up transfer time as a result of synchronized operation with the AC
source at all times, allowing interruption-free transfer for sensitive equipment.
Intelligent software for power management.
Either Hard-wire or dual AC outlets connection are available.
Loading and temperature controlled cooling fan.
Fan aging, failure, disconnection and blockage alarm.
Selectable bypass/Inverter modes.
Local and remote management and control.
RS-232 communication.
Dry contact terminal.
Efficiency >90%. (Full linear load at 220VAC Output)
Advanced Protection Features：
Input over/under voltage protection.
Internal over temperature protection.
Input reverse polarity protection (Fuse).
Output overload protection.
Output short circuit protection
AC input short circuit protection：Breaker (6 Amp or 12 Amp)

4
2-2. Block Diagram
The inverter features IGBT technology which, minimizes weight and dimensions
while enhancing output short circuit reliability and overload capacity.
AC output voltage is provided in one of the two modes：
1. From DC to AC Inverter Mode：(On-line Mode)
2. From AC Input Bypass Mode：(Off-line Mode)
Either mode is programmable from the front panel.
In the first option, Off-line mode, AC output power will be supplied through the AC
bypass mode during normal operation. In the event of AC input failure, output power
will be diverted through the DC to AC Inverter Mode. Once AC mains are restored,
the unit will switch back from the Inverter Mode to the Bypass Mode.
In the second option, On-line mode, AC output power will be directly provided by the
inverter from the DC source. If the DC source or inverter fails, the system will transfer
its output power through the bypass mode. Once the DC power source is restored,
the system will switch back to the inverter mode.

5
2-3. Electrical Performance
Electrical
Specification
Model No.
Item
SR1000(T)-124
SR1000(T)-148
SR1000(T)-224
SR1000(T)-248
Output
Continuous Output Power
1000W
Maximum Output Power
(3 Min)
1100W
Surge Power
2000W
Frequency
47~63Hz ± 0.5% (User-selectable)
Output Voltage
97~123VAC (User-selectable)
194~246VAC (User-selectable)
Efficiency (Full Load)
87%
88%
90%
91%
Short-Circuit Protection
Yes, lpk
Output Waveform
Pure Sine Wave (THD<2%)
Input
Voltage
24VDC
48VDC
24VDC
48VDC
Input Over-Voltage Protection
30~34VDC
60~68VDC
30~34VDC
60~68VDC
60VDC Max.
(Only UL)
60VDC Max.
(Only UL)
Input Under-Voltage Protection
18~22VDC
36~44VDC
18~22VDC
36~44VDC
Voltage Range
18~34VDC
36~68VDC
18~34VDC
36~68VDC
36~60VDC
(Only UL)
36~60VDC
(Only UL)
No Load Current
1.4A
0.75A
1.3A
0.7A
Signal and
Control
LCD Panel
2 Lines LCD panel with keypad for navigation
LED Indicator
Red / Orange / Green LED
Dry Contact Terminal
By a relay
Remote Control Terminal
Controls the inverter ON / OFF operation
Protection
Input Protection
Over / Under voltage, reverse polarity (Internal fuse)
AC Output Protection
Short-circuit, overload
AC Input Protection
12 Amp circuit breaker
6 Amp circuit breaker
Temperature Protection
Shutdown (Internal temperature ≧65℃)
Bypass Relay
Relay Specification
15 Amp / 120VAC, 10 Amp / 250VAC
Bypass relay selectable
On Line / Off Line (Haphazard, Normal, Exacting) selectable
Switching Time
From AC bypass mode (Off-line mode)：≦20mS
From DC to AC inverter mode (On-line mode)：≦8mS
Environment
Working Temp.(Full load)
0℃~ 50℃
Storage Temp.
-30℃~ 70℃
Safety & EMC
Safety Standards
Certified UL 62368-1
Certified EN 62368-1
EMC Standards
Certified FCC class B
EN 55032: 2015+A11:2020
EN 55035: 2017 / A11: 2020
Fan Operation
& Indicator
Failure Indicator
Buzzer alarm and dry contact
Switches On When
Internal Temperature ≧55℃or Load ≧30%
Switches Off When
Internal Temperature ≦45℃and Load ≦20%
Others
Dimension (WxHxD)
483 x 44 x 395 mm / 19.02 x 1.73 x 13.55 inch
Packing
7.46kg; 2pcs / 15.9kg / 1.74 CUFT
Application
Focus on telecommunication (base-station), networking (data center) &
battery backup system.
Note：The specifications are subject to change without notice.

6
2-4. Mechanical Drawings
Unit：mm [inch]
2-4-1. SR1000 Mechanical Drawings

7
2-4-2. SR1000T Mechanical Drawings
SR Series Inverter Ordering Information
Model Number
Input
Voltage
Output Voltage
Nominal
Output Voltage
Range
Frequency
Range
SR1000/SR1000T-124
24 VDC
110 VAC
100~120 VAC
47~63 Hz
SR1000/SR1000T -224
24 VDC
230 VAC
200~240 VAC
47~63 Hz
SR1000/SR1000T -148
48 VDC
110 VAC
100~120 VAC
47~63 Hz
SR1000/SR1000T -248
48 VDC
230 VAC
200~240 VAC
47~63 Hz

8
3. Installation and Maintenance
3-1. Rear Panel
No.
Description
No.
Description
No.
Description
①
DC Input Negative(-)
④
Dry Contact Terminal
⑦
AC Output Socket
②
DC Input Positive(+)
⑤
Standard RS-232
⑧
AC Input Socket /
AC Input Terminal
③
Remote Contact
Terminal
⑥
Chassis Ground
⑨
AC Output Breaker
3-1-1. DC Input Connection ①②：
Follow the instructions to connect the battery cables to the DC input terminals of
the inverter. The cables should be as short as possible, ideally less than 6 feet
(1.8 meters), to ensure they can handle the required current according to
Electrical Codes and Regulations. The cable size should be thick enough to limit
the voltage drop to less than 2% when carrying the maximum input current.
This prevents frequent low-input voltage warnings and shutdowns. Excessive
voltage drop across the DC cables between the batteries and the inverter may
result in a warning for Under Voltage Protection (UVP). To improve the situation,
consider increasing the size of your DC cables..
Batteries can deliver very high currents in the event of a short circuit. If a short
circuit occurs in the cable run between the batteries and the input terminals of the
inverter, it can cause overheating or melting of the cables, posing a risk of fire and
injury. To prevent this hazard, use a Very Fast Acting DC Fuse in line with the
positive cable. Place the fuse as close to the positive battery terminal as possible.
Consider using Bussmann ANN series fuses.

9
The following cable size and fuses are recommended for up to 6 ft. distance
between the batteries and the inverter. (Applicable to both 120 VAC and 230 VAC
versions)：
Model No.
Wire AWG
Inline Fuse
SR1000/SR1000T-124 / 224
# 4
80 A
SR1000/SR1000T-148 / 248
# 6
40 A
When connecting DC input terminals to 24V / 48V battery please note.
[ + ] is positive, and [ - ] is negative. Reverse polarity connection can blow the
internal fuse and may damage the inverter permanently.
WARNING!
Make sure that all the DC connections are tight (torque to 9 –10 ft-lbs,
11.7 –13 Nm). Loose connections could result in overheating and can
lead to a potential hazard.
WARNING!
The recommended inline fuse should be installed as close to the battery
positive terminal as possible Failure to use a fuse on the “+” cable running
between the inverter and battery may cause damage to the cable /
inverter and will void warranty.

10
Also, only use high quality copper wire and keep the cable length as short as
possible. Suggestive cable length is 3 - 6 feet.
3-1-2. Remote control and Dry contact terminal ③④：
Remote Control Terminal ③：
1. Before installing the inverter, ensure that the main switch is in the "OFF"
position.
2. Before using the remote function, ensure that the main switch is pressed
towards "REMOTE".
3. Ensure that the remote contacts are turned off.
4. Use 20 ~ 24 AWG wire to connect the remote control terminals.
5. Remote control ON/OFF inverter setup status：

11
Note：Only one remote function should be used to control the inverter at a time.
The maximum voltage value is 60VDC.
Dry Contact Terminal
Relay
COM.
Common contact
N.C.
Normally closed contact
N.O.
Normally open contact
Dry Contact Terminals ④：
Dry contact terminals can be connected to a Form C relay for "FAULT"
indication. When a "FAULT" occurs, the relay switches. Note: Fault conditions
include input under/over voltage, output short circuit, over temperature,
overload, and fan failure.
Specifications of the Relay
Maximum
Voltage
Load
Contact Rating
Number of
operations
Operating/Storage
Temperature
N.O.
N.C.
240 VAC
Resistive
16 A
─
100,000
-30℃~70℃
240 VAC
Resistive
─
8 A
─
30 VDC
Resistive
16 A
─
─
30 VDC
Resistive
─
8 A
─
3-1-3. Standard RS-232 ⑤：Serial port monitoring and control through computer
interface.
3-1-4. Chassis Ground ⑥：The equipment must be connected to an earth ground
before making any other connections.

12
3-1-5. AC output socket ⑦：
3-1-6. AC wiring connections ⑧
SR1000：AC socket
SR1000T：AC input and AC output terminal

13
Connect AC input wiring to the inverter socket.
Please use the following information for reference.
【SR1000 Version】
Socket
Wire color
Wire length / gauge
120 VAC
230 VAC
AC Output
Line (L)
NEMA
I.E.C C13
Within 16 feet / AWG # 14~16
26~32 feet / AWG # 12~14
Neutral (N)
AC Input
Line (L)
I.E.C C14
Neutral (N)
Chassis Ground
Green / Yellow or Bare copper
Note：Please double check and review all the connections to ensure that the wires
are connected to the correct inlet.
【SR1000T Version】
Socket
Wire color
Wire length / gauge
120 VAC
230 VAC
AC Output
Line (L)
Black
Brown
Within 16 feet / AWG # 14~16
26~32 feet / AWG # 12~14
Neutral (N)
White
Blue
AC Input
Line (L)
Black
Brown
Neutral (N)
White
Blue
Chassis Ground
Green / Yellow or Bare copper
Note：Please double check and review all the connections to ensure that the wires
are connected to the correct terminals and that the connections are tight.
3-1-7. AC input breaker ⑨：
The AC input circuit breaker protects the unit from overload. When an overload
condition occurs, the circuit breaker trips and disconnects the AC grid power input.
To reset it, push the circuit breaker button. Before resetting the unit, identify and
correct the cause of the tripping.

14
3-2. Front Panel
No.
Description
No.
Description
No.
Description
○
A
Main Switch
○
C
LCD Display
○
E
Fan Ventilation
○
B
LED Indicators
○
D
LCD Display Selection Buttons
3-2-1. Main Switch ○
A：These are the 3-stage rocker switches for turning on, turning
off and remote mode.
3-2-2. LED Indicators ○
B：Refer to Section 5-1 for detailed information.
3-2-3. LCD Display Selection Buttons ○
D：
Press these buttons to display data such as DC input voltage, AC output
voltage, AC output frequency, AC output current, and system status
sequentially on the LCD display. For more information, please see Chapter 5.
3-2-4. FAN Ventilation ○
E：The fans behind the ventilation grilles provides cooling.
DOT NOT obstruct these vents!
3-3. Maintenance
3-3-1. Ensure that the fan vents are not blocked.
3-3-2. Use a vacuum cleaner to remove any dust from the fan area.
3-3-3. When cleaning the case or front panel, use a soft, dry cloth, only. If the case
or front panel is very dirty, use a neutral, non-abrasive detergent. Do not use
alcohol or ammonia based solutions.
3-3-4. Regular servicing, and relocation of the inverter, should be performed by a
qualified service technician.
3-3-5. Avoid spilling liquid on the inverter.

15
4. Operation
4-1. Connecting the input power
Before making the connections on the DC input side, ensure that the main switch is
in the "OFF" position.
4-2. Connecting the loads
Calculate the total power consumption(W) of the output load. Ensure that the total
power consumption does not exceed the rated load.
If the total load exceeds the rated capacity of the inverter, remove non-critical
loads until the rated total has been reached.
4-3. Inverter Operation
Set the power switch to the “ON” position. The buzzer will sound “beep beep” and
the inverter will carry out self-diagnosis. The LED will also appear various colors
and it will display ”SR-1000 INVERTER INITIALIATION.”. Finally, the buzzer will
sound another “beep”, the “INVERTER” and status LED will turn “Green” and the
LCD Display will show “Vi, Vo, FQ, Io“. The inverter will start operating normally.
Set the power switch to the “OFF” position. The inverter will stop and all the lights
that are on will turn off.
4-4. Protection Features
Model
DC Input (VDC)
Over Temperature Protection
Over Voltage
Under
Voltage
Alarm
Under Voltage
INTERIOR
HEAT SINK
Shut-down
Restart
Shut-down
Restart
Shut-down
Restart
Shut-down
Restart
24V
30.1~34.1
28~32
19~23
18.1~22.1
23~27
65℃
45℃
105℃
75℃
48V
60.1
56~60
38~46
36.1~44.1
46~54

16
5. Front LCD Panel –Display & Setup
5-1. LCD Panel Indications
5-1-1. Set the Power Switch to the “ON” position. Inverter will start the operating
under the normal condition and you can see the status of Vi, Vo, FW, Io
displayed on the LCD screen：
Note: Vi = Input Voltage, Vo=Ouput Voltage, FQ = Frequency, Io = Output Current
5-1-2. ○
ALED INDICATORS：
AC GRID：Displays the AC input status.
AC Input
LED Status
The AC input power and the inverter output power are
synchronized (note)
Green
AC input power is under detecting
Orange
AC input power is off
Off
Note：The grid AC input frequency and DC-AC inverter output frequency and
phase are the same (See details in Section 5-3-3).
INVERTER：Displays DC-AC inverter status.
DC-AC Inverter
LED Status
Power OK
Green
Power Not Good
Red
BYPASS：Displays Power Bypass status.
Bypass
LED Status
Power Source of AC
Output (Load)
From DC-AC inverter
(On-line Mode)
Orange
AC Input
Off
DC-AC Inverter
From AC input bypass
(Off-line Mode)
Green
AC Input
Off
DC-AC Inverter
A
B
C

17
ALARM：Displays the Failure status.
Alarm
LED Status
DC Over Voltage / DC Under Voltage/ FAN Alarm
Orange
Note：For instructions on setting the alarm, see details in Section 5-3.
5-1-3. ○
CLCD DISPLAY SELECTION BUTTONS：
Function of Various Keys：
Function <Up>：You can use the “Up” button to scroll through the menu.
or to select the value for the set-up under the setting mode.
Function <Page Up>：You can use the “Page Up” button to scroll up the
menu page.
Function <Page Down>：You can use the “Page Down” button to scroll
down the menu page.
Function <Enter Setup Menu>：Press the button longer than 2 seconds,
The inverter will change to “Setup Menu Mode” (the detail in Section 5-3)
for the user to set up functions.
Function <Enter>：Confirms a selection or value.
5-1-4. ○
BLCD DISPLAY：Displays inverter’s operational status.
5-2. Startup Sequence and Standby Status
5-2-1. Once turn on the inverter, the display shows “SR-1000 INVERTER
INITIALIATION.”. Then. You can check the inverter status as the below flow
chart.
Status flow is as follows：

18
5-3. Setup Menu –Operation and Instructions
Entering Setup Menu：
Press Button longer than 2 seconds. The inverter, enters the Setup Menus
consisting of three layers：
(1)Select Menu Heading：(2)Select Menu Item：(3)Setting Value：