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Functional Control for a Standalone Unit ESIE05-07

2–20 Part 2 – Functional Description

P Feedback check function.

PotMin:

During 'loaddown to physical minimum (limit switch)' (after unit turned OFF and stop sequence):

1. If feedback signal is not changing after 5 loaddown request, this means unit has reached Min-

ComprCap and limit switch disables more loaddown, then PotMin = AIComprCap.

2. If compressor is turned off, then after feedbackvalue becomes minimum (12%) there are 5 extra

loaddowns of 10s done. If after 5 loaddowns the feedback is not changed, the feedback is stored

as new minimum feedback (PotMin = AIComprCap). (After Power on, the pumpleadtimer is pre-

vented to run before this evaluation is finished. During normal operation, this extra loaddown is

only done if the thermostat is not requesting loadup).

- Extraloaddown is stopped when emergency stop safety is active. (reason: control motor has no

power anymore).

- Extraloaddown is also stopped when any control motor safety is present. After the reset of the

control motor ERR, an extraloaddown procedure is activated and the compressor of that circuit is

prevented to start up.

Pot88:

During working of unit:

1. If feedback signal is not changing after 5 loadup request, this means unit is on 100% and limit

switch disables extra loadup, then Pot88 = AIComprCap.

2. If unit has reached 100%, then a Pot88 check will be done by giving a Request for extra Loadups

of 10s. As long as the feedback value changes (goes higher), this extra loadup is done again.

After 5 loadups with no change in feedback, Pot88 = AIComprCap.

(This extra loadup is stopped if unit requests a loaddown by thermostat for that circuit).

P Stop sequence for Stepless screw compr:

When unit is on and running on for example 100%, then when unit is turned off, the compressor must

go to 12% Delta and after compressor stop timer go off. After this the stepless control motor must go

to its minimum position (until limit switch disables to go lower) instead of staying at the position it was

before unit is turned off (100% in this example).

After Power ON of the unit, the compressor will go from 12% valve to stepless control when control

motor is at minimum position (startup condition) to prevent the compressor to be restart at the same

capacity after a power failure. Also when unit is turned off, the control motor will go to minimum position

(limit switch).

AIComprCap [Ohm]

ComprCap [%]

Pot88 (

90 Ohm)

PotMin+Pot88

(Between 0 35 Ohm)

PotMin

12% 100%

ESIE05-07.book Page 20 Wednesday, October 11, 2006 10:42 AM