Coronet Engineers Pvt. Ltd.
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Specially developed for variable torque loads such as fans & pumps.

Equipped with a newly systemized automatic energy saving, PID control, lifetime alarm and line/inverter operation changeover sequence functions, etc.

Perfect for air conditioners, fans & pumps that were previously difficult to consider for use with an general-purpose inverter because of costs and function.

High-performance, compact inverter


Great performance through dedicated designs welcome to the new generation of inverter for heating, ventilating & air conditioning

  • New energy-saving function
  • Simplified maintenance
  • Environment and panel design
  • Network compatibility
  • Long life design of inverters
  • Optimum functions for HVAC
  • Operator-friendly features
  • Global compatibility
Output Frequency
Item Explanation
Setting Range Maximum frequency 25 to 120Hz
Base frequency 25 to 120Hz
Starting frequency 0.1 to 60.0Hz
Carrier frequency 0.75 to 15kHz (200V/400V: 0.75 to 22kW)
0.75 to 10kHz (200V/400V: 30 to 75kW)
0.75 to 6kHz (200V/400V: 90 to 500kW)
Accuracy (Stability) Analog setting: Less than 0.2% of maximum frequency (at 2510C)
Keypad setting: Less than 0.01% of maximum frequency (at -10 to +50C)
Setting resolution
Analog setting: 1/1000 of maximum frequency (ex. 0.06Hz at 60Hz, 0.12Hz at 120Hz)
Keypad setting: 0.01Hz (99.99Hz or less), 0.1Hz (100.0Hz or more)
Link setting: Selectable from 2 types
- 1/20000 of maximum frequency (ex. 0.003Hz at 60Hz, 0.006Hz at 120Hz)
- 0.01Hz (fixed)
Item Explanation
Control method V/f control
freq. characteristic

(Polygonal line)

Possible to set output voltage at base frequency and at maximum output frequency (common spec.). AVR control can be turned ON or OFF.

1 point (Arbitrary voltage and frequency can be set.)

Torque boost

(Load selection)

Torque boost can be set with the function code F09.

Select application load type with the function code F37.
0: Variable torque load
1: Variable torque load (for high starting torque)
2: Auto-torque boost
3: Auto-energy-saving operation (variable torque load in acceleration/deceleration)
4: Auto-energy-saving operation (variable torque load (for high starting torque) foracceleration/deceleration)
5: Auto-energy-saving operation (auto-torque boost in acceleration/deceleration)

Starting torque 50% or over
Start/stop Keypad operation:
Start (FWD/REV) and stop with and keys.
Start and stop withandkeys.

External signals(7 digital inputs):
Forward (reverse) rotation, stop command (capable of 3- wire operation), second operation command, coast-to-stop command, external alarm, alarm reset, etc.

Link operation:
Operation through RS485 communication and Field Bus communication (option)

Operation command switching:
Remote/local switch, link switch, second operation command switch

Frequency setting Keypad operation: Can be set with keys

External potentiometer:
Can be set with the external variable resistor (1 to 5kW, 1/2W)

Analog input
Can be set with external voltage/current input.
0 to +10V DC (0 to +5V DC)/0 to 100% (terminal 12, V2)4 to 20mA DC/0 to 100% (terminal C1)

Multistep frequency :
Selectable from 8 steps (step 0 to 7)

UP/DOWN operation :
The frequency rises or lowers while the digital input signal is turned on.

Link operation :
Can be set with RS485 communications and field bus communications (option).

Frequency setting change :
Two types of frequency settings can be switched with an external signal (digital input). Changeover between remote and local (keypad operation) or frequency setup through communication is also possible.

Auxiliary frequency setting :
Inputs at terminal 12, C1 or V2 can be added to the main setting as auxiliary frequency settings.

Inverse operation :
The digital input signal and function code setting sets or switches between the normal and inverse actions.
- +10 to 0V DC/0 to 100%(Terminal 12, V2)
- 20 to 4mA DC/0 to 100%(Terminal C1)

Acceleration/ deceleration time 0 to 3600s
- Acceleration and deceleration pattern can be selected from 4 types: Linear, S-curve (weak), S-curve (strong), Non-linear (constant output max. capacity).
- Shutoff of the operation command coasts the motor to decelerate and stop.
Frequency limiter High and low limiters can be set (setting range: 0 to 120Hz)
Bias frequency Bias of set frequency and PID command can be set in the range between 0 and 100%.
Gain for frequency setting The analog input gain can be set in the range from 0 to 200%.
Jump frequency setting Three operation points and the jump width (0 to 30Hz) common to the three points can be set.
Restart after momentary power failure - The inverter restarts upon recovery from power failure without stopping the motor.
- In the "operation continuation mode," recovery of the power supply is waited for while the output frequency slightly drops.
- Selection can be made among starting at 0Hz, starting at the frequency immediately before the momentary power failure, and starting at a set frequency for the starting method after power recovery.
Current limit Keeps the current under the preset value during operation.
Line/inverter switching - Line/inverter switching (starting at line frequency) can be made with a digital input signal (SW50, SW60).
- A built-in line/inverter switching sequence performs sequence control with a digital input signal (ISW50, ISW60) to output a signal (SW88, SW52-1, SW52-2) for controlling an external magnetic contactor (MC). As a built-in sequence, two types can be selected, including the one switching automatically to the line upon an inverter alarm.
PID control Capable of PID regulator control for process

Process commands
-Key operation ( keys)
: 0 to 100%
-Analog input (terminal 12, V2)
: 0 to +10V DC/0 to 100%
-Analog input (terminal C1)
: 4 to 20mA DC/0 to 100%
-UP/DOWN (digital input)
: 0 to 100%
-Communication (RS485, bus option)
: 0 to 20,000/0 to 100%

Feedback value
-Analog input (terminal 12, V2)
: 0 to +10V DC/0 to 100%
-Analog input (terminal C1)
: 0 to 20,000/0 to 100%

Incidental functions
-Alarm output (absolute value alarm, deviation alarm)
- Normal operation/inverse operation
- Small water flow stoppage function
- Anti-reset wind-up function
- PID output limiter
- Integration reset/hold

Pick-up Operation begins at a preset pick-up frequency to search for the motor speed to start an idling motor without stopping it.
Automatic deceleration Upon a DC link voltage exceeding the over voltage limit level during deceleration, the deceleration time automatically extends to avoid an trip.
The motor loss increases during deceleration to reduce the load energy regenerating at the inverter to avoid an trip upon mode selection.
The output voltage is controlled to minimize the total sum of the motor loss and inverter loss at a constant speed.
Active drive The output frequency is automatically reduced to suppress the overload protection trip of the inverter caused by an increase in the ambient temperature, operation frequency, motor load or the like.
Auto-tuning The motor parameters are automatically tuned.
Cooling fan ON/OFF control Detects inverter internal temperature and stops cooling fan when the temperature is low.


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