Emerson Vilter VSS Serie Manual De Instalación, Operación Y Mantenimiento página 179

ICM/ICAD Motorized Valve
Frequently Asked Questions What happens in the event of a power failure?
© Danfoss (AC-SMC/MWA), 11-2011
Installation, Programming, and Troubleshooting
The ICAD actuator will remain in the position it is in when power is lost. There are two approaches to solving
the issue:
• Add a UPS (Uninterruptible Power Supply) device to the power wiring. This is easily accomplished with
the brown (-) and black (+) wires in the power cable bundle. A UPS device is available from Danfoss
and can provide up to 10 amps of power for up to 90 seconds in order to move the valve to the desired
position. Because of the high amperage, the UPS is capable of providing power to several ICAD actuators
depending on the size of the actuator. NOTE: The UPS is not a continuous power supply. It is only meant
to change the valve position once in the event of a power failure.
• Add a solenoid valve in front of the ICM in order to stop refrigerant flow. This is a simple solution
provided that there is no issue associated with the additional pressure drop through the solenoid valve.
How much power do I need to supply to the ICAD?
The total power required depends on the ICAD size and the number of ICAD's powered by the dc power
supply. The power for each ICAD is:
• ICAD 600 (ICM 20, 25, and 32), the requirement per valve is approximately 30 watts.
• ICAD 900 (ICM 40, 50, and 65), the requirement per valve is approximately 50 watts.
• ICAD 1200 (ICM 100, 125, and 150) the requirement per valve is approximately 75 watts.
How can I monitor the valve position remotely?
The control wiring bundle provides for a 4 to 20 mA or 0 to 20 mA signal output with the blue (+) and orange
(-) wires. The signal can be sent to:
• A remote display
• A PLC or PC
• Another ICAD actuator to provide the same input signal (daisy chain)
Which valves can I use the ICAD 1200 with the optical encoder on?
The optical encoder provides a positive means of measuring the actual position of the valve. It is designed
into the ICAD 1200.
• The ICAD 1200 is used on the ICM 100. 125, and 150 valves
• The ICAD 1200 can also be used but is not required on the ICM 40, 50, and 65 valves
At what minimum OD%/mA will the ICAD automatically close and calibrate?
The ICAD will automatically close or be closed when the opening degree is below 3% which corresponds to
4.48 mA. After it is closed it will give a few extra steps to calibrate the valve.
If the 4-20mA signal is lost while the valve is open, will the ICAD close the valve?
Yes, if the input signal is lost while the valve is open, the ICAD will close the valve and flash an A3 alarm which
is for an input error.
How many turns/revolutions with the manual tool will fully open/close ICM valve?
• ICM 20: 1.25 turns
• ICM 25: 2.5 turns
• ICM 32: 3 turns
• ICM 40: 4 turns
• ICM 50: 5 turns
• ICM 65: 5 turns
• ICM 100: 12.75 turns
• ICM 125: 15.25 turns
• ICM 150: 18.25 turns
Does the ICAD make a high frequency noise?
Yes, when the ICAD is at standstill, it will generate a high frequency noise which is normal.
What size wire gauge is recommended to run to the ICADs?
The typical wire gauge is 22 AWG. For power wiring, the recommended maximum lengths (for 22 AWG) are:
• ICAD 600 90 feet
• ICAD 900 50 feet
• ICAD 1200 30 feet
Heavier wire gauge will allow for longer lengths of power wiring. For example with 17 AWG, maximum
lengths are:
• ICAD 600 285 feet
• ICAD 900 170 feet
• ICAD 1200 115 feet
Control wire lengths can be as long as 1500 feet.
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