AUTHORIZED SERVICE PROVIDER

TRAINING PROGRAM
Training Week 1
 CPS 50/60 KW
inverter
 Training team
 Program Manager – Bibin Babu
 Service Manager – James Oswald
 Application and Service
Engineering team.
Overall schematic of CPS 50/60 KW
inverters
Technical Data for 50/60 kw inverter
DC Input 50KW 60KW Environment
Max. DC Input Voltage 1000V 1000V Protection Degree NEMA 4x
Operating DC Input Cooling Variable speed cooling fans
200~950V 200~950V
Voltage Range Operating Temperature
MPPT Voltage Range 480~850V 540~850V -30℃ ~ +60℃
Range
Max. Input Current 68A/MPPT 68A/MPPT Operating Humidity 0~95%, Noncondensing
Start-up DC Input 4000M
330V/80W 330V/80W Operating Altitude
Voltage / Power （Derating from 2000M）
AC Output System
Rated AC Output Power 50KW 60KW Topology Transformer less
Max. AC Apparent Power 50kVA/55kVA 60kVA/66kVA
Max. Efficiency 98.80%
CEC Efficiency 98.5%
Rated Output Voltage 480V 480V Night Consumption ＜1W
Output Voltage Range 422~528V 422~528V
Display and Communication
Grid Connection Type N
3Φ/ N / PE 3Φ/ N / PE Display LCD+LED
optional
Communication Standard: RS485 (Modbus)
Max AC Output Current 60.2A/66.2A 72.2A/79.4A
Rated Output Frequency 60Hz 60Hz
Output Frequency Range 57~63Hz 57~63Hz
CPS inverter protection feature
 AC output voltage and frequency monitoring
 Anti-islanding detection with bi-directional frequency perturbation
 DC input and AC output over-voltage protection
 DC input and AC output over-current protection
 DC input insulation to ground monitoring
 DC injection of AC output
 DC Arc-fault detection and circuit interruption
 Leakage current to ground monitoring
 Internal enclosure temperature monitoring
 IGBT power module temperature monitoring
 KVA overhead to produce rated Active Power at 0.91 power factor
 Load rejection over voltage (LROV) protection
 No neutral connection required - delta connection permitted with external AC GFCI
 PVRSS certified rapid shutdown compliant to 2017 NEC (RSD version only).
Installation/ replacement of 50/60 kw
inverter
Cable Connection / termination

 DC Cable
 14-6AWG (Copper only) when terminating to the fuse holders- Can use I without the
ferrules.
 6~2AWG (Copper or Aluminum) when using the Bypass Terminal kit accessory
 AC Cable
 AC Output terminal block #6-3/0 AWG (CU) #6-3/0 AWG (AL)
 Internal grounding bar #6-4 AWG (CU)
 External grounding point - #6-4 AWG (CU)
Cable Connection / termination
 PV string checking procedure
 Open fuse holder before connecting PV cable
 Check polarity and voltage of each string should not exceed 1000V as it can cause
damage to power train in power head.
 Distribute the cables evenly on all the three MPPTs.
 When installing replacement 25A or 30A fuses, these fuses may not be installed in
adjacent fuse holders. An empty or unused fuse holder must be positioned
between each 25A/30A fuse within each MPPT
 Use of fuses from other manufacturers or incorrectly sized fuses can cause either
equipment damage or create an unsafe working condition. Any damage resulting
from use of incompatible fuses is not covered by the CPS warranty
User Interface for 50/60 kw inverter
Main Screen For clearing protect 260 fault verify if the
For clearing Grid related fault verify if the
inverter Grid standard is set right. Otherwise
inverter PV input mode is set right. Otherwise
go to settings and change the Grid Standard.
go to settings and change the PV input mode.

Press Esc Key Press ENT Key

When you are at the output data screen . Press down arrow key and you will be able to read the measurement data
User Interface for 50/60 kw inverter
Settings Please do not share the password ‘5555’ to unauthorized customers

Press Esc Key Press ENT Key

Press ENT Key

User Interface for 50/60 kw inverter
Settings
Press ESC Key to go down to the
Arc clear and confirm to clear ‘Arc
Protect Fault’ and then perform
Arc detect to do a sanity check

Press ENT Key

User Interface for 50/60 kw inverter
Settings – Protection parameters
User Interface for 50/60 kw inverter
Settings – LVRT/HVRT Setup
User Interface for 50/60 kw inverter
Settings – Power derating set up
Ctrl Mode 1 for Remote dispatch
Ctrl mode 2 for Local control
Change value of Percentage to derate inverter
User Interface for 50/60 kw inverter Settings
– Reactive Power derating set up
Ctrl Mode 1 for Remote dispatch
Ctrl mode 3 for Local control by PF
Change value of PF Set value for the inverter

For enabling KVA Headroom Enable

‘Reactive PowerOver ‘
Note : Verify if the system is designed for the extra
KVA rating or not.
User Interface for 50/60 kw inverter
Settings – Arc Parameters
For avoiding nuisance Arc fault error, Change the For avoiding nuisance Arc fault error, Change the
filter 1 setting to 40% filter 2 setting to 40%
(only after verifying that issue is not site related) (only after verifying that issue is not site related)
User Interface for 50/60 kw inverter
Settings – Other Parameters
After confirming the Grounding issue is not site
related you can try increasing the GFCI static value
till 650 mA.

For Protect 0070 and DC bus fault you

can updated setting of the inverter by
1.5% to avoid the nuisance error.

For adding start delay for the site

requirement, Kindly update the Power
On delay

For updating Duplication factor after

approved by Service team for site with
higher THD.
 Installation/
replacement of 50/60
kw inverter
 Distance between inverters is to
keep hot exhaust air from one
inverter away from intake of
other inverter.
 The spacing between the
inverters may be increased based
on the location and ambient
temperature areas >45-degree
Celsius.
 Keep the LCD and Keypad at
accessible height taking
consideration for known flooding
and snowing areas.
 Unnecessary Stress
on Inverter

 Avoid direct exposure to sun light

 Internal ambient temperature
could rise 15 degree C more than
normal
 Output power is reduced because
high internal temperature
 CPS provides shade cover for
inverter
 Don’t Make A Mistake Worse

 DC switch only disconnects PV circuit to inverter

electronic compartment
 DC switch does not de-energize PV circuit with
reverse polarity or short problem
 Check current in DC circuit on PV side of fuse before
open fuse holder
 Do not open fuse holder when there is current.
Disconnect at PV home run if PV string circuit must be
disrupted. Don’t Rush to Open
Fuse Holder to Stop
the DC Short !!
Waterproofing

 Use conduit with water proofing

gasket
 Tighten plastic plug on all unused
opening, especially side openings.
WATER: Keeping Inverter Properly Sealed

 Don’t leave Inverter

out in the cold without
power for extended
period
 Freezing moisture
inside inverter may
condense on heatsink
 Call us for inspection
inside inverter power
If inverter was nonoperational for head before applying
90 days. Call CPS Hotline before
startup for inspection. Damages
DC or AC power
due to this negligence is not
covered under warranty.
Trouble Shooting: GridV.Outlim/Protect0150
 Check
 Voltage reading on AC information screen
 Type: Line – Neutral or Line – Line; Is it matching actual connection?
 Reading value:
 Within limit per standard: at no load, at full load
 Difference between phases less than 10%
 Compare with voltage reading with meter at AC terminal
 Action
 Check circuit breaker rating. Replace circuit breaker if it trips often.
 Change transformer tap if Grid voltage is near high limit of trip standard.
 Adjust Grid voltage trip points if having agreement from customers/utility
 Adjust inverter imbalance tolerance to max of 10%
Trouble Shooting: Isolation Error

 Resistance from PV terminals to earth ground lower than threshold. This is

safety check during inverter startup process
 Possible causes:
 Fault inside inverter causing PV shorted to chassis
 Nicks or cuts on PV cable causing short or low resistance to conduit/earth ground
 Moisture on PV panel causing low impedance to frame. In this case, inverter
sometimes delays startup until later in the day
Trouble Shooting: Isolation Error

DC switch ON: Check voltage

Voltage not balanced
from PV+ and PV- to chassis

DC switch OFF: check voltage PV+

Voltage balanced and PV- to chassis
(~ 1/2 PV string)

Adjust Isolation
resistance threshold Voltage floating Voltage not floating
down problem in inverter problem with PV wiring
Trouble Shooting: Protect0070

 Positive and Negative internal bus is out of balance

 Possible cause
 High percentage of imbalance between phases of Grid voltages
 Possible solution
 Increase IDCmax to 1.5% of rated AC current to allow inverter more range to make
correct to internal bus to compensate for Grid voltage differences.
Trouble Shooting: Protect0100

 Ground leakage current too high

 Possible cause:
 Moisture on panel results in increase of parasitic capacitance from PV to frame
therefore increase leakage current to Earth Ground
 Possible solution:
 Increase leakage current threshold to 300mA (max value)
 Communication: What to Check First
 Communication checklist:
 Set unique address for each inverter on Modbus network
 Replacement inverter needs to have Modbus ID set to correct ID
 Baud rate check
 Wiring polarity: 485+ and 485-
Typical Also Energy Modbus board

GND: to B+ : to A- : to SHIELD: to
RS485_GND RS485_A+ RS485_B- chassis of
of inverter of inverter of inverter Inverter
Communication: 2 Wires or 3 Wires

 Recommend 3 wires: 485+, 485-, and Common

 Reduce common mode voltage transient between inverters especially with long
distance between inverter
 Periodic Maintenance
for String Inverter

 Limited, light service

expectation:
 Terminal wiring torque
 Clear debris and dirt from fan
guards
 A clean fan has expected lifespan
of at least 5 years
But not this one
Procedure for firmware upgrade of 50/60 kw
inverter (latest version 11.0 and 9.0)

 Procedure to update firmware for 50/60

kw inverter
 Prepare a USB flash drive (Capacity less
than 8G) and format the drive to FAT32
 Copy the LCD firmware file and the DSP
firmware file into the USB flash drive.
 Insert the USB flash drive into USB port on
the inverter’s communications board.
 Using the password to enter the Setting
menu and select Firmware Update.
Choose the firmware to be updated (DSP
first and then LCD ) and follow the
prompts on the screen
 When the update is successful repeat the
process, if necessary, to update the next
firmware (DSP or LCD). Should the update
fail, return to step 4 when prompted and
repeat the process
Warnings for 50/60 KW inverter
Warn0040

DC SPD Fault Check the DC SPD Located at lower

bottom corner of the wire box.
Switch off the inverter and make sure the DC fuses are
in open conditions
Check the DC SPD indicators are in green state. If the
SPD are showing red indication, they need replacement
Re insert the DC SPD one by one and check the pin if
they are damaged or bend.
Ifthe problem still persist, contact CPS Service tech
support line.
Common Alarms and protection for 50/60 kw inverter
Common Alarms and protection for 50/60 kw inverter
Fault for 50 /60 KW inverters
CSP 50/60 kW inverter- What's New
 NEC 2017 PVRSS Certified Rapid Shutdown
 55 & 66kVA rating allows max rated Active Power @±0.91PF
 Selectable Max AC Apparent Power of 50/55kVA and 60/66kVA
 NEC 2014/17 compliant & UL listed Arc-Fault circuit protection
 Smart-Grid Rule 21 & UL1741SA Certified
 15-90° Mounting orientation (vertical, angled, or lay flat)
 Fully integrated Standard or Rapid Shutdown wire-box