Version 2.02 15.05.2007
Function of VS 3000
37
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With a negative control error, speed is reduced by the PI controller. At minimum speed one fan c apacity staged
in unloaded with a set delay and at the same time speed is increased to maximum. Finally the speed adjuster is
disabled through the first fan output S1of the VS 3000 when speed drops to 0.
If a minimum speed greater than 0 has been entered for the speed adjuster in the Min. Speed parameter (Menu
3-2-2-1), speed is ramped down to 0 after a definable time Basic Time OFF Fan 1) and fan output S1 is
switched off. Switching from fixed-speed mode back to variable-speed mode is not made until pressure drops
below the tc setpoint. The run -down speed curve for a system equipped with five fans is illustrated in the follow-
ing diagram:
t
Speed [%]
100%
Speed
minimum
Fan 5
Fan4
Fan 3
Fan 2
Enabling
Speed adjuster
Stage 1
Switch OFF delay
Fan stage
ZNR. 51203 74 730 E0
Enabling fan stages (Parameter ENAB.COND., Screen 3-1-e)
Enabling of fan stages is directly allocated to the fan relays. Accordingly the speed adjuster and connected fans
can be disabled by disabling Fan Stage 1. When the first stage is disabled, HP control works as a step controller
with stages 2 to n-1.
The maximum number of stages that can be disabled or enabled is as follows:
- VS 3000 basic configuration: 3 fan stages
- One SIOX extension module added: 7 fan stages
- Two SIOX extension modules added: 11 fan stages
The stage No. Cond.Stages + 1 for fixed-speed operation cannot be programmed. It is not shown on the AL 300
Operator Terminal, CI 3000 Store Computer or in the LDSWin PC software.
3.27.9 Heat recovery mode
Heat recovery mode (HR) of the VS 3000 Pack Controller is implemented with two parameters:
S The HR max. parameter (Menu 3-3-2) specifies the maximum condensing temperature allowed in HR mode.
For control purposes the temperatures are converted to pressure of the selected refrigerant:
S The HR dif. parameter (Menu 3-3-2) defines a temperature difference.
If pressure rises to a level greater than HR max., the first fan stage is loaded immediately (without regard to pro-
grammed control times). Each additional fan stage is loaded at the end of the basic start time (without regard to
the variable control time).
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