Q: How do Color Changing Troffers (CCT) work?
The CCT is just a ceiling troffer filled with Cove RGB circuit boards.
As such, the operation is identical to a string of Cove strips.
The CCT is continuously powered by 24VDC from the ELT600-24U power box.
Without a color control signal, the default state of the CCT troffer is off.
When 3 channels of 12-21VDC color selection control voltage is supplied to the terminal strip in the CCT then it turns on.
The color selected is controlled by special pulse width modulation (PWM) of the three-color control signals.
Everbrite supplies a color control keypad ECL-49-KIT that sends digital commands to the ECL-42-02 driver box.
The driver board in that ECL-42-02 box produces the appropriate AC line synchronized PWM signals to control the desired color.
These control signals must go through signal filters before entering the MRI room.
As such, the operation is identical to a string of Cove strips.
The CCT is continuously powered by 24VDC from the ELT600-24U power box.
Without a color control signal, the default state of the CCT troffer is off.
When 3 channels of 12-21VDC color selection control voltage is supplied to the terminal strip in the CCT then it turns on.
The color selected is controlled by special pulse width modulation (PWM) of the three-color control signals.
Everbrite supplies a color control keypad ECL-49-KIT that sends digital commands to the ECL-42-02 driver box.
The driver board in that ECL-42-02 box produces the appropriate AC line synchronized PWM signals to control the desired color.
These control signals must go through signal filters before entering the MRI room.
Q: What are the wiring rules for installing Color Changing Troffers?
Each ELT600-24U power supply box can power up to 16 of the 2x2, 8 of the 2x4, or 4 of the 4x4 troffers.
Either the 2x2 or the 2x4 troffers will use one output each from the fuse box, but the 4x4 troffer requires two each.
When using signal filters to broach the MRI room wall, you must solder the wires on the equipment room input side of these filters!
Failure to do so will often result in flickering effects in the CCT troffers.
You can also get flickering in the CCT troffers if the signal filter input feedthrough capacitor has been damaged.
So be careful when you solder to the signal filter.
Either the 2x2 or the 2x4 troffers will use one output each from the fuse box, but the 4x4 troffer requires two each.
When using signal filters to broach the MRI room wall, you must solder the wires on the equipment room input side of these filters!
Failure to do so will often result in flickering effects in the CCT troffers.
You can also get flickering in the CCT troffers if the signal filter input feedthrough capacitor has been damaged.
So be careful when you solder to the signal filter.
Q: On the Color Changing Troffers, my colors are inconsistent, and do not match the "standard colors".
The Everbrite signal filters have dual isolated channels, other multiple channel signal filter brands may not be sufficiently isolated.
This can lead to significant cross talk (color bleeding) and inconsistent colors.
The "standard" colors generated by the ECL-49-KIT keypad are:
Key 6 is especially for hues of white, the "standard" is 5000ºK.
This can lead to significant cross talk (color bleeding) and inconsistent colors.
The "standard" colors generated by the ECL-49-KIT keypad are:
- Red
- Amber
- Green
- Blue
- Magenta
- Mixed White
Key 6 is especially for hues of white, the "standard" is 5000ºK.
Q: One of my Color Changing Troffers is dark. How do I troubleshoot this?
Each CCT is fed power from a different fuse in the ECL-35V-xx class 2 wiring and distribution fuse box.
The 4x4 CCT is fed power from two different fuses in the ECL-35V-xx fuse box so half of it could be dark.
Each fuse board has 6 fuses that are associated with terminal block outputs.
If you do not have a wired run in one or more of the fuse terminal blocks, then the associated fuse may be used as a spare.
The fuses are in sockets, so they may be unplugged and swapped as needed.
If you change the fuse, and the dark troffer blows it immediately, then you need to troubleshoot further.
The troffers have a chain of RGB CCT sticks in them which are held in place by clips.
If the troffer is blowing fuses, and you know it is not due to a wiring short then it is likely that one of the CCT sticks is shorting out the 24V.
The best way to test for the shorted CCT stick is to unclip them all and take them to a bench where you can use an ohm meter.
The power pins are the heavier gauge white (+) and black (-) wires with no pin in-between them on one side of the connectors.
The bad stick will read close to zero ohms across the power pins.
Perhaps the easiest way to check out the CCT sticks is to borrow the terminal strip board from the CCT troffer and use diode check.
The 4x4 CCT is fed power from two different fuses in the ECL-35V-xx fuse box so half of it could be dark.
Each fuse board has 6 fuses that are associated with terminal block outputs.
If you do not have a wired run in one or more of the fuse terminal blocks, then the associated fuse may be used as a spare.
The fuses are in sockets, so they may be unplugged and swapped as needed.
If you change the fuse, and the dark troffer blows it immediately, then you need to troubleshoot further.
The troffers have a chain of RGB CCT sticks in them which are held in place by clips.
If the troffer is blowing fuses, and you know it is not due to a wiring short then it is likely that one of the CCT sticks is shorting out the 24V.
The best way to test for the shorted CCT stick is to unclip them all and take them to a bench where you can use an ohm meter.
The power pins are the heavier gauge white (+) and black (-) wires with no pin in-between them on one side of the connectors.
The bad stick will read close to zero ohms across the power pins.
Perhaps the easiest way to check out the CCT sticks is to borrow the terminal strip board from the CCT troffer and use diode check.
Contact
📌Bruce Neville - Engineering Manager
☏ 1-620-213-4451 Direct Voice & SMS
⏱ Mon - Fri 8AM - 5PM CST
📌Bruce Neville - Engineering Manager
☏ 1-620-213-4451 Direct Voice & SMS
⏱ Mon - Fri 8AM - 5PM CST
Company
Everbrite Electronics Inc.
720 West Cherry Street
Chanute, Kansas 66720
Everbrite Electronics Inc.
720 West Cherry Street
Chanute, Kansas 66720