Toro SitePro Central Control Installation Manual download pdf (Page 8)

Communication Cable Test

Correct installation of the communication cable is essential for proper operation of the wireline control system. The communi-

cation cable must be tested for the presence of significant voltage, circuit continuity and excessive resistance. A digital multi-

meter and a 620 ohm resistor are required to perform the following tests.

A. Remove the communication wire connector plug(s) at the SPU.

B. Test for the presence of voltage on the communication and drain wires as follows:

Connect the positive lead of the voltmeter to either end of a wire circuit and the negative lead to an earth ground. If the volt-

meter indicates more than one volt, connect a 620 ohm resistor between the open end of wire circuit and earth ground.

Perform the voltage test again. If the voltage drops to less than one volt, the condition is acceptable. If the reading exceeds

one volt, it may be due to a direct connection or induced if the communication cable is run with the power wires. A minimum

spacing of 12" (30.5 cm) is required between the communication cable and power wires. Locate the source of power and

correct before continuing.

C. Test the communication and drain wire circuits for possible cross connection (yellow connected to gray, etc.). Perform the

test as follows:

Connect one ohmmeter lead to each communication wire; the Ohmmeter should indicate an open circuit. If the Ohmmeter

indicates a complete circuit, check the communication wire connector plug at each satellite controller or DIU location for a

possible crossed connection. When the wire circuit has been corrected and/or tested successfully, continue to the next step.

D. Test the communication and drain wire circuit for continuity and total resistance. Perform test as follows:

At the furthest satellite controller or DIU location, install a jumper wire across the communication wires. At the SPU, touch

the Ohmmeter leads to the signal wire connector plug. If the circuit continuity is good, the Ohmmeter will indicate some

resistance. Record the resistance reading for future reference. If the circuit is open (no resistance), check the communica-

tion wire connector plug at each satellite or DIU location for loose or improperly installed wires. When the circuit has been

tested successfully and resistance recorded, remove the jumper wire and replace with a 620 ohm resistor.

E. Determine if the measured resistance of the communication wire circuit is less than or equal to the maximum allowable

resistance. The allowable resistance of 16 AWG (1.0 mm

) signal wire is 7 ohms per 1000' (305 m). The allowable resist-

ance of 18 AWG (0.75 mm

) signal wire is 11 ohms per 1000' (305 m). Calculate the resistance as follows:

Divide the length of the circuit by 1000' (305 m). Multiply the quotient by 7 for 16 AWG (1.0 mm

) wire or 11 for 18 AWG

(0.75 mm

) wire. The product is the maximum allowable resistance for the circuit.

Example: Total length of 16 AWG (1.0 mm

) wire circuit is 3500' (1067 m)

3500' (1067 m) ÷ 1000' (305 m) = 3.5

3.5 x 7 ohms = 24.5 ohms

F. Compare the actual circuit resistance measured in Step D with the calculated allowable resistance. If the actual resistance

exceeds the maximum allowable, check the cable for damage and/or a possible break. Also check the connection at each

satellite for loose or improperly installed wires. If the actual resistance is less than or equal to the allowable resistance, the

circuit is properly installed. When both wire circuits have been tested successfully, reconnect the communication cable con-

nector plug at the SPU and at all satellite or DIU locations.

FIU Front Panel Components

The front panel provides information on the communication activity

between the PC, FIU and satellites or DIU by displaying a series of indi-

cator lights. An illuminated power switch is provided to turn the FIU on

and off.

Note: Refer to the Troubleshooting section on page 12 if the indicator

lights do not function as described.

PC Connected + : Indicator light flashes rapidly when the PC is trans-

mitting data to the FIU. During idle periods of non-transmission, the light

will be off.

PC Connected – : Indicator light flashes rapidly when the PC is trans-

mitting data to the FIU. During idle periods of non-transmission, light will

remain ON. The light will also be ON if PC connected and the FIU’s

power is off.

FIU Active + : Indicator light flashes rapidly when the FIU is transmitting

data to the PC. During idle periods of non-transmission, the light will

remain off.

FIU Active – : Indicator light flashes rapidly when the FIU is transmitting

data to the PC. During idle periods of non-transmission, the light will

remain on.

Note: For FIU-2011 and FIU 2021 models, the Ch 3 FIU Active light will

be on if the PC is not connected.

FIU Ready: Indicator light will be on when the data lines are open and

ready for communication.

Figure 10

Power

Switch

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Toro SitePro Central Control Installation Manual Page 8

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