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Melink INTELLI-HOOD-2 Manual

Controls keypad displays and audible sounds
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MELINK INTELLI-HOOD-2 CONTROLS
KEYPAD DISPLAYS AND AUDIBLE SOUNDS
Typical Display
Normal Operation
In Normal Operation, the keypad will cycle through 4 hoods (H-1, H-2 ...) displaying a
bar graph for each hood channel indicating the fan speed of that channel.
Clean Light – Blank or Flashing Red and Green
Clean Light should be blank at all times of Normal Operation. Clean Light will flash red
and green if there is an Optics Fault. See Optics Fault in the Troubleshooting list
following.
Fault Light – Blank or Green
In Normal Operation, fault light will be blank or green. A blank fault light indicates
Normal Operation with no faults. A green fault light indicates that the system is
receiving a digital input on one of the digital input terminals 25 through 33. A green fault
light is a normal occurrence on many systems.
Fault Light – Red
Fault light will change to red in the case of any fault. See fault codes in the
Troubleshooting list following.
Sounds
Keypad is typically silent. In Normal Operation, it will beep only when buttons are
pressed such as turning it on/off or turning lights on/off. Keypad will beep if it is
commanded by an external input to turn on using Remote on/off function. Keypad may
beep indicating other problems. See Troubleshooting list following.

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Summary of Contents for Melink INTELLI-HOOD-2

  • Page 1 MELINK INTELLI-HOOD-2 CONTROLS KEYPAD DISPLAYS AND AUDIBLE SOUNDS Typical Display Normal Operation In Normal Operation, the keypad will cycle through 4 hoods (H-1, H-2 …) displaying a bar graph for each hood channel indicating the fan speed of that channel.
  • Page 2 MELINK INTELLI-HOOD-2 CONTROLS TROUBLESHOOTING SYMPTOMS AND REPAIR ACTIONS 1. Keypad appears normal, but fans are not running. a. Check if VFDs are running. Check VFD maximum speed and amp draw. b. Check if fan disconnect switch is on. c. Check if fan belt is adjusted for proper tension.
  • Page 3 6. Keypad is blank. Fans are not running. a. Press the Fans Button to turn on the fans. b. On/Off command may be by another device other than the Fans button. On/Off command may be from a toggle switch, water wash panel, or Building automation system.
  • Page 4 10. Keypad shows a low optic fault, F1-o, a. Check that optics are connected to the hood channel indicated. b. Clean optic lenses c. Check for obstructions such as fire suppression pipes between the Emitter and Receiver d. Increase the gain switch of the Receiver e.
  • Page 5 15. Vertical Bar graph is flashing and keypad will not shut off the fans a. System is in exhaust temp alarm mode. b. Press the up arrow to check temperatures. Verify temperatures are correct. c. Check Hood Parameter Hx04 d. Check the number of temperature probes programmed and check actual number installed.
  • Page 6 20. Fan increases in speed when the optics are blocked but they never slow down. a. Check the programming of the clock. Press the Enter key to see the system time. If it shows 1200, A, 1 (12 midnight on Sunday), then you know that the processor time was not programmed.
  • Page 7 When the VFD is displaying a fault Fxxx, clear the fault by pressing the Red “stop” button on the face of the VFD. To restart the fans, shut them off and restart them. In most cases, use the Melink keypad Fans button to do this.
  • Page 8 Output Filter and/or brake resistor will reduce the feedback voltage the drive sees from the motor. These options are possible. o Melink has seen cases where a bad disconnect switch caused this fault. It is similar to a short in the motor windings.
  • Page 9 18Hz. For example, the minimum speed of Intelli-hood is 40%, then P35 should be kept above 45 Hz. o Adjust S-Curve parameter A083. Typically Melink sets this to 20%. Change to 30 or 40%. This extends the  acceleration time, but makes acceleration smoother and reduces the maximum amp draw.
  • Page 10 Melink suggests contractor to bypass or replace the disconnect switch. o Melink suggests replacement of the motor. o Melink suggests replacement of the wiring between the VFD and motor. Wiring can be damaged by conduit that is not deburred completely.