Melink Intelli-Hood Controls Reference Manual page 9

Operation/Service Specifications for Melink Intelli-Hood Operator
Simplissimo Settings
Hood Settings
Exhaust Temp Span - This sets up the temperature span for modulating VFD speed between its set
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minimum and maximum based on temperature. The span has a low value of 75 F and a maximum of up
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to 150 F. Auto Span automatically sets the temperature span based on average VFD speeds over
periods of approximately one day (starting with the 75-110 setting).
Min Speed - This sets up the minimum speed that the VFD will run. Min speed must be less than
maximum speed. DF means that when fans are turned on, the fans will run at 100% for 1 minute and
then return to their normal minimum speed. Maximum minimum speed is 80%.
Max Speed - This sets up the maximum speed that the VFD will run. Max speed must be greater than
minimum speed. Minimum maximum speed is 50%.
Exhaust Temp. Alarm #1 - This sets up the first temperature set point for the 24 VDC exhaust alarm.
Set pt #1 must be less than set pt #2. If the operator tries to set up a set pt #1 greater than or equal to set
pt #2, the error beep will sound. When the setpoint is reached, and the bar graph corresponding to the
hood in alarm will flash and 24Vdc will be sent to the corresponding I/O board terminals. If a setting with
the AUD prefix is selected, then when the hood's speed is being displayed on the bar graph and the
exhaust temperature exceeds the temperature set point #1, the keypad's beeper will sound. The keypad
will go through 12 iterations of beeping the beeper for the alarm.
Exhaust Temp. Alarm #2 - This sets up the second temperature set point for the auxillary 24 VDC
output. Set pt #2 must be greater than set pt #1. If the operator tries to set up a set pt #2 less than or
equal to set pt #1, the error beep will sound. When the setpoint is reached, 24Vdc will be sent to
corresponding I/O board terminals.
No. Hood Sensors - This sets up the number of temperature sensors and optics for the given hood. The
hood can have from 1 to 4 temperature sensors and 1 optics sensor; or it can have from 1 to 4
temperature sensors only; or it can have just 1 optic sensor. Optic Channel 1 is always allocated to Hood
1, Optic Channel 2 is always allocated to Hood 2, and so on. Temperature Channel 1 is always allocated
to Hood 1, Temperature Channel 2 is always allocated to Hood 2, and so on.
Note: It is typically not good practice to connect temperature sensors from different hoods together since
the signal is averaged across all sensors connected to that particular channel, potentially having a
detrimental effect on system response to heat.
Auto Fan On/Off – Sets fans to either turn on or off automatically based on either temperature or a
preset timer (turns fans off after set number of hours). In Heat 0 or Heat 5, system will resume typical
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operation when exhaust air temperature of any hood is greater than or equal to 90 F. If exhaust air
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temperature is less than or equal to 75 F, while the system is on, the either a signal for either 0% or 5%
will be sent to the VFD. If all hoods are at this level, the system will turn off. Note: when fan button is
pressed, there is a ten minute delay until the temperature sensor becomes active for auto on/off
operation.
Send 4-20mA / 0-10V - This sets up the channel for which the VFD is connected for this hood. If 0, then
there is no VFD for the hood. VFD 1 - VFD 4 are outputs on the master Autocal board. VFD 5 - VFD 8
are outputs on the slave Autocal board. If Multiple is selected, then the VFD signal will follow that of the
previous hood (e.g. If Hood 1 is set up with VFD 1 as the output to its exhaust fan, the Hood 2 may be set
to multiple to follow VFD 1 for the supply fan).
Short Cycle Hood Ratio - This sets up the short cycle hood ratio.
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