Danfoss MCX08M User Manual

Danfoss Electronics spa
Air Handling seq.- user manual
DKRCC.PS.RI.A1.02 / 520H4358 - Air Handling Seq. user manual - V 2.2
Produced by Danfoss Electronics spa Graphic Department, 10-2009
51
12| Supply and return fans
SUPPLY AND RETURN FANS
FAN Fans Min Max Default U.M. Text value
GEN General
F00 Fan control type 1 3 ONOF ;ONOF;REQ;PId
F01 Probe selection 1 3 SUP ;SUP;REt;bAR
F02 Minimum speed 0,0 F03 0,0 %
F03 Maximum speed F02 100,0 100,0 %
F04 Coils OFF with fan OFF 1 2 NO ;NO;YES
F05 Stop fans for antifreeze 1 2 YES ;NO;YES
SUF Supply Fan
SF1 Time at maximum speed at
startup
0 9999 0 SEC
SF2 Anti resonance 0,0 100,0 0,0 %
SF3 Anti resonance zone 0,0 50,0 0,0 %
SF4 Fan delay at startup 0 9999 5 SEC
SF5 Fan delay at OFF 0 9999 5 SEC
REF Return Fan
RF1 Time at maximum speed at
startup
0 9999 0 SEC
RF2 Anti resonance 0,0 100,0 0,0 %
RF3 Anti resonance zone 0,0 50,0 0,0 %
RF4 Fan delay at startup 0 9999 5 SEC
RF5 Fan delay at OFF 0 9999 5 SEC
REG PID Regulation
Fr1 Action of regulation 1 4 DIR ;INV;dIR;CO1;CO2
Fr2 Setpoint -15,0 110,0 12,0
Fr3 Proportional band 0,1 20,0 2,0
Fr4 Integral time 0 9999 0 SEC
Fr5 Derivative time 0 9999 0 SEC
Tab 38_ [Supply and return fans - Supply and return fans]
The type of supply fan control is dened using parameter F00.
The return fan, if present, is assumed to be controlled as the supply fan.
Each fan functions only if its dampers are open.
12.1| Type of supply and return fans
The parameters that enable setting the way fan is controlled is F00 – Fan control type.
If F00=ONOF, the fan is an ON/OFF unit, it starts when the unit is turned on (after delay time SF4 has
elapsed) and always remains on except in the case of fan alarms, re and antifreeze (see “12.3] Fans and
antifreeze”).
The fan is controlled using the digital output “SUF - Supply Fan”.
If F00=REQ, the fan is only activated when temperature or humidity control action is requested.
The following 3 digital outputs are used to control the fan; they have been conceived to run a fan with a
star-delta connection arranged for 2 operating speeds.
“SUF - Supply Fan” – is activated when a control action is requested (line contactor)
“SFL - SupplyFanLow.” – is activated as indicated in the gure (star contactor)
“SFH - SupplyFanHigh.” – is activated as indicated in the gure (delta contactor)
Then the analog output “SUF - Supply Fan” is used, activated in a manner proportional to the demand.
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Danfoss MCX08M Specifications

General

Brand	Danfoss
Model	MCX08M
Category	Controller
Language	English