HygroMatik HPS250, Руководство по эксплуатации

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Page 91
Glossary ctd. (2)
Switchover point 81 Defined switching threshold for switchover from one 
load level [64]
to an other depending on the input
signal level.
Virtual interlock (safety) system 86 If control via à
Communication interface [13]
was selected, software is used to place a logical switch in
series with the hardware interlock (safety) system. This switch can be opened and closed via à
Software
commands [12]
. If the hardware interlock (safety) system is closed and the switch is opened via software
control command, steam production is stopped and the unit is placed in "Remote switch-off" status.
Hygiene flushing 87 For hygiene reasons, the controls of the VDI 6022 are set so that flushing must take place at intervals of not
longer than 48 h. An interval of < 48 h can be set. The factory setting is 24 h.
Pressure reduction 88 To relieve the pressure system, the solenoid valves to the nozzle sections are opened for the time set in the
"Pressure_reduction_duration" parameter while the water supply solenoid valve is closed and the high
pressure pump is switched off.
Supply voltage 89 The units are designed for connection to supply voltage ranges (e.g. 380 to 415 VAC in case of a 400 VAC
unit, s. name plate)
Unit name 90 Here, "Unit 1" is entered by default.
Recording 93 The control can record 10 data sets internally on a rolling basis. Snapshots of the unit status are carried out
at intervals of 10 s, which can be helpful for troubleshooting. When the storage space is filled, a new set of
data overrides the oldest entry. The complete record can be saved to a USB stick with NTFS formatting.
PI controller 96 Internal controller with control characteristics which contain a P roportional part and an I ntegral part. Both
parts are variable as parameter settings.
Digital input 97 Digital input on the mainboard and on the relay boards for switching functions. A logical meaning (e.g. timer
start) is assigned to the digital input via the

Digital_input_function [98]
parameter. The digital input must be
wired on-site in accordance with its use, e.g. with a

Pushbutton [106]
or a

Switch (NO) [102]
against
the 20 VDC on terminal 8 on the mainboard terminal strip ST08 or the terminal strip ST05 on the other
available boards. When the
20 VDC voltage is applied (short-term via a

Pushbutton [106]
or permanent
via a

Switch (NO) [102
] ), as required in accordance with

Digital_input_function [98]
parameter setting),
the switching function is carried out.
Digital_input_function 98 Determines which function will be executed if the 
Digital input [97]
on the mainboard or one of the relay
boards is activated by applying an

Auxilliary voltage [105],
either short-term (via a push-button) or
permanent (via a switch).
Load shedding 101 Load shedding can be set up by assigning the

Function_digital_input [98] "Power limitation" to the

Digital input [97]
. When the

Digital input [97]
is then then connected to an

Auxilliary voltage [105]
by
means of a 
Switch (NO) [102]
, 
Max. humidification output [43]
is reduced by the percentage set up in
the " Δ power limitation" parameter. After withdrawel of the voltage normal operation is reestablished.
Switch (NO) 102 Electrical switch with N ormally O pen contacts
Auxiliary voltage 105 DC voltage in the range of 5…20V for activating the 
Digital input [97]
via a 
Pushbutton switch [106]
or a

Switch [102]
. +20 VDC is available on Pin 3 of ST08 (mainboard) or ST05 (relay board). The auxiliary
voltage is required to switch the

Digital_input [97]
on the mainboard or a relay board in order to trigger the
function defined by setting the

Function_digital_input [98]
(e.g. switch on ECO mode).
Push button 106 Electrical switch for momentary action
Frequency converter 108 Electronical device for control of the asynchronous motor of the pump group. Pump speed determines the
pump pressure.
Pressure controller 109 Integrated

PI controller [96
] for pressure control of the system. The control signal of the pressure
controller is effective on the

Frequency converter [108]
and - consequently - on the pump speed.
Nozzles (status) 110 The spray image of the nozzles may change due to the faintest contamination. In that case cleaning is
adequate in a ultrasonic bath (s. maintenance section). If the nozzles are clogged with time by lime deposits,
the inner system pressure may rise as compared to the pressure at the time of commisioning without
showing any external signs. Control can detect this variation by means of an algorithm.
Load 111 The spray system (e.g. the vortex modules) can be segmented into nozzles that allow for a more delicate
humidification control by phased control. The nozzle sections are referred to as "loads" in this document.
The switch-over points between the loads are parameterizable.
Supply air humidification 112 Normal system operation
Input signal limitation 113 When using an external controller, the full swing of the 
internal actuator signal [42]
may be assigned to a
cut-off window of the external controller signal swing. By doing so, a better control resolution may be
achieved in a particular region. The cut-off window is defined by the parameters "Limitation_ext._X1" (lower
value) and "Limitation_ext._X2" (upper value) .
Combined system 114 This particular made-to-order-system allows the switch from

Supply air humidification [112
] to

Exhaust air cooling [62
]. Switching is usually controlled by the Building Control System via a relay contact
or through an other on-site switching device.