Danfoss 080Z2502 User guide

Lighting control

AK-SC 255

Service Guide

ADAP-KOOL® Refrigeration Control System

Service Guide | Lighting control AK-SC 255

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Photocell type selection: Skylight (Enables the ‘slope between 2 points’ algorithm)

Control method setup MUST be: Schd and photo

Num of control points: 1

Trip level: 2000fc A middle range setpoint.

Trip Range +/- : The value added to the trip level to turn Sales Lights OFF and allow

them back ON.

Trip level of 2000 fc “plus” 200 trip range will turn lights OFF at 2200 fc.

Trip level of 2000 fc “minus” 200 trip range will allow sales lights back ON

at 1800 fc.

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Pre delay: Delay in minutes before the zone can come ON. (Scheduled time)

Post delay: Delay in minutes before the zone can be turned OFF.

Minimum ON time: The time that must elapse once the zone has been turned OFF,

before the zone can be turned OFF again.

Minimum OFF time: The time the zone MUST stay stay OFF before coming back

ON.

The ‘Min Out & Max Out’ fields would are interpreted as follows:

Min Out at:

If the skylight sensor indicated a reading greater than or equal to 1800 footcandles (fc),

the dimmer would be set to 2% . (Mnimum output)

Max out at:

If the skylight sensor indicated a reading at or below 800 fc, the dimmer would be set

to 65 % (Maximum output.)

All readings between these 2 extremes would set the dimmer output per the following:

(‘Min out at’ – sensor)

------------------------- x (‘Max. output’ – ‘Min. output’) + ‘Minimum output’

(‘Min out at’ – ‘Max out at’)

Thus, a sensor reading of 1200 fc would result in a dimmer output of:

(1800 – 1200) 600

----------------- x (65% - 2%) + 2 % = ------ x 63% + 2% = 39.8%

(1800 – 800) 1000

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Based on “default” setpoints, the algorithm will work as follows:

Dimming Algorithm Reference Table

Actual fc

VO %

800

65% (maximum)

850

62%

900

59%

950

55%

1000

51%

1050

49%

1100

45%

1150

43%

1200

40%

1250

37%

1300

32%

1350

30%

1400

27%

1450

24%

1500

20%

1550

17%

1600

15%

1650

11%

1700

8%

1750

5%

1800

2% (minimum)

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Algorithm interval is the algorithm cycle.

Max rate of change is the percentage of adjustment per second.

With a setting of 1 % for a 1 second algorithm cycle, and a 2% minimum and 65 %

maximum output, the full range can be covered in 63 seconds. (1 percent per second

for 63 steps.)

This schedule turns the zone ON and OFF on a time base. (Setup for 24 hours)

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Configuration of variable output. Setup for 0-10 vdc.

Misc. Conversion factor setup for Dimmer Feedback signal:

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Setup of analog inputs:

Skylight sensor to PHOTO-SKY type

Dimmer feedback to misc. conversion factor DIM FEEDBK

This calculation looks at the feedback signal and if it is ever above 70% will become

true. (The maximum allowed is 65%, and if wiring is disconnected, the signal will go

to 100%.)

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Dimmer Disconnect relay setup: Ten minute delay for alarm trigger:

Sensor failure alarms setup screen: Covers High and Low conditions

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Software version and date stamp:

Dimmer Disconnect added to History samples:

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Expanded status screen of dimming algorithm in operation:

Note run times and cycle counts.

User definable set point screen:

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Dimmer Health Check calculations:

The health check is basically a “pulse” of the dimmer algorithm.

Dimmer Health Check Relay setup:

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Dimmer Health Check Alarm setup:

If the variables in the Dimmer Health Check calculations fail for (7) days, then the

Health Check Alarm becomes active and tigers. (7 x 24 = 168 hours)

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History screens:

The history sample below shows an ideal dimming scenario. The skylight sensor rises

at the peak light of the day and the system algorithm responds accordingly. The sales

lights go off at 2000 foot candles and back on at 1800.

This is a zoom view of the above history sample. Notice that the variable output and

the dimmer feedback are tracking right along with each other.

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Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products

already on order provided that such alternations can be made without subsequential changes being necessary in specifications already agreed.

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