Nortec NHPC Engineer's Manual page 75

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(b) Proportional Controller microprocessor with following features or functions:
1 Graphic function display with user interface with touch type key pad.
2 Acceptance of industry standard [analogue continuous control demand signal
[0-1Vdc] [1-5Vdc] [0-10 Vdc] [2-10 Vdc] [0-16 Vdc] [0-20 mA]
3 Keypad/Display to monitor and control humidifier parameters.
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b
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(c)
1 Internal communications via Modbus RTU protocol provides monitoring and
control allowing humidifier(s) to communicate to Building Management
System (BMS). Supporting a RS485 port with a configuration of 9600bps,
8-bits, no parity, one stop bit shall support the following variables:
a
b
c
d
10-20
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2008-10-01
Manual capacity output adjustment range of 20-100%.
Humidifier model, capacity, software version.
Cylinder model # and capacity rating.
Humidifier run time weighted hours.
Date and time (year, month, day, hour and minute).
Stand by heating to increase steam production response time.
Rapid modulation capability reduces response time upon start-up.
Short cycling detection and correction diagnostics.
Foam detection and correction capability.
Scroll through start-up and troubleshooting checklist on graphical display.
Self-diagnostics during start-up to system test to prevent unsafe operation
of the unit(s).
User adjustable drain/flush frequency.
HUMIDIFIER CONTROLS NHPC
System demand in lbs/hr (kg/hr).
Security loop status open/close.
Control Channel 1 demand %.
Manual capacity output adjustment range of 20-100%.
Self-diagnostics during start-up to system test to prevent undase
operation of the Unit[s].
Control signal type.
Software version.
Change Cylinder – Indicates cylinder needs to be replaced (read).
Channel 1 Input – Humidifier input value being supplied to channel 0-
100% (read/write).
Channel 1 Set point – Control channel 1 setpoint for relative humidity in
space 0-100% (read/write).
Channel 2 Input – Humidifier input value being supplied to channel 0-
100% (read/write).