Advantech INTRAC-305 System Alarm indicator to illuminate and the Intrac to, Enter Standby Mode

FAULT FINDING INTRAC-305

Install new lamp and wire assembly. Wrap reflector sheet around lamp. Replace securing tapes to secure reflector.

Turn unit face up and ensure that backlight is free from contamination - dust may be blown free.

Slide backlight into display unit. Replace metal cover over backlight. Replace retainers, press centre to secure.

Locate display unit over the four studs and fit the nuts.

Re-fit INTRAC front panel to side panels, reconnect flex cable and lamp wires.

Replace INTRAC top cover, reconnect power, switch on and verify that the lamp illuminates.

Some, or all, front panel	The six menu keys, the numerical keypad and the manual
keys do not function	control keys are all connected in a matrix. There are three
	supply lines to the matrix and eight return lines. If any one of
	these lines fails at least three keys will cease to function. The
	fault may be the ribbon cable to J27 (Interface PCB), the
	connectors or the Interface PCB itself.
	If only one key does not function the fault will be with that key
	and the front panel PCB will have to be replaced. This board
	is held on the front panel by six threaded studs. Disconnect
	the ribbon cable and the emergency stop switch (note which
	wire goes to which terminal). Remove the six nuts and lift the
	PCB off the studs.
Emergency Stop Switch Fails	Pressing the front panel emergency stop switch should cause
	the System Alarm indicator to illuminate and the INTRAC to
	enter Standby Mode.
	The switch consists of two normally closed (N.C.) contacts
	pressing the switch opens both sets of contacts. The switch
	connects to the Interface PCB through the front panel PCB
	and the ribbon cable. If the switches are OK and there is
	continuity to connector J27 on the Interface board the fault is
	on that board.
Pointing Angles Incorrect	The resolvers consist of three coils two of which move with
	respect to the third. A continuous signal is sent from the
	INTRAC to the fixed coil and is induced into the other two
	coils. The amount of induction in each coil is dependant on
	the respective position of the coils.
	The signal sent from the INTRAC is the same for all
	resolvers.
angles constantly varying	Constantly changing angles is caused by noise on the two
	return signal lines. This implies that the source signal is not
	present in the resolver. For one angle (i.e. Az, El or Pol) to
	be changing either the circuit to the resolver is broken or the
	resolver itself is faulty.

Page 80 INTRAC-305 MANUAL - Issue 3.2 © 2011 Advantech Wireless