will have minimum IP65 protection class, fitted with self-cooling fans venting through filters, capable of 100 % continuous RMS load up to 50 $^{0}$C, at least 110 % overload for 60 seconds and capable of providing constant torque when high start torque required. All electronic parts shall be varnished against adverse effects of wastewater environment or equally protected. 

Frequency converters shall be micro processor based, fully configurable and fitted with an internal multilingual alphanumeric control panel with keypad-display for user interface for monitoring, adjusting parameters, manual control and configuration of the converter. Frequency converters shall come with an extensive library of pre- programmed application macros to allow rapid configuration of its in and outputs. 

Control panel of F/C’s are capable of placing onto the relevant compartment on MCC panel. 

Frequency converters shall have the following configurable in and outputs: 

• Two analogue (4-20 mA) inputs. 

• Two analogue (4-20 mA) outputs. 

• Six digital inputs. 

• At least two digital outputs. 

All available signals shall be provided for telemetry and wired to the PLC for remote control and monitoring. 

## 8.7.17 Motor valve controllers 

Motor starter for motor valves shall include the following: 

There will be two port ethernet/BUS communication in actuator systems. (mechanical reference) 

• Motor circuit breaker, suitably rated miniature circuit breaker with overcurrent protection. 

• Suitably rated miniature circuit breaker for the control circuit. 

• Complete power and control circuit inside the actuator. 

• Door mounted: 

- Indicating lamps for fully opened, fully closed, malfunction. The following colours are to be applied: 

- Selector switch for hand-off-automatic (HOA) control. In position: 

 Valve fully opened "Green" 

 Valve fully closed "Yellow" 

 Valve malfunction "Red" 

 Hand: The operator controls operation of the motor by means of open/close switch buttons. The automatic control system is bypassed. 

 Off: The motor is switched off and inoperative. The automatic control system is bypassed. 

 Automatic (Auto): The motor is controlled by the automatic control system. The open/close switch is inoperative. 

Actuators should have internal power and control units, 

- Open/close switch. 

