ALCO EC3-33x, Руководство пользователя

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EC3-33x Coldroom Controller with EX5
User Manual
EC3-33x
A.6.5.063E - Rev 4
15
Emerson Electric GmbH & Co - ALCO CONTROLS - Heerstr. 111 - D-71332 Waiblingen - Germany - Tel.: ..49 (0) 7151 509 0 - Fax: 49 (0) 7151 509 200
Defrost Object
The defrost object is responsible for the defrost function. If the object is disabled it will change to “defrost standby”, any running
defrost will be terminated, no further defrost will happen. No network variable updates will be performed, the object will not react on
any input network variable update. Object status information is send by the nvoStatus variable of the node object. If the object has a
defrost termination alarm, the alarm bit (“in_alarm”) of the status structure will be set.
Network Variables
Variable Type Name Type Meaning
SNVT_lev_disc nviDefrostEnable I External start signal to activate a defrost. The ST_OFF to
ST_ON transition will start the defrost. If the variable change
to ST_OFF while the object is in the defrost cycle, the defrost
will be terminated and the end of defrost cycle starts
SNVT_defr_state nvoDefrostState O Defrost object status
SNVT_temp_p nvoDefrTemp O Currently used defrost termination temperature
SNVT_lev_disc nvoHeater O Status of the defrost heater
SNVT_lev_disc nviStartUp I Input to terminate a synchronized defrost, ST_ON will start
end of defrost cycle
SNVT_lev_disc nviDefrLock I Defrost lock, if ST_ON no defrosts are possible, any running
defrost will be terminated
SNVT_lev_disc nvoDefrCtrlSync O used for synchronized defrost by bindings
SNVT_lev_disc nviDefrCtrlSync I used for synchronized defrost by bindings
UNVT_DEFSYNC nvoDefrEndSync O used for synchronized defrost by bindings
UNVT_DEFSYNC nviDefrEndSync I used for synchronized defrost by bindings
SNVT_elapsed_tm nvoDefrostTime O Defrost duration
SNVT_state nvoDefrStatus O Detailed status of the defrost object
UNVT_DEFROST nciDefrostCnfg C Defrost object configuration structure
The network variable from type SNVT_temp_p will have an value of 0x7FFF in case of an sensor failure or if no data
was read from the sensor input.
The network variable “nvoDefrStatus” is a bit field and will represent the current status on the defrost object.
Bit No. Description
0 0 = no Defrost cycle , 1 = Defrost cycle
1 0 = Heater off , 1 = Heater on
2 0 = Pulsed heater off , 1 = Pulsed heater on
3 0 = Demand defrost off, 1 = demand defrost on
4
5
6
7
8
0 = no termination alarm, 1 = termination alarm