Toshiba LQ500 specifications External connections

LQ500

		CVVS
	Ec+	Conductivity
RF part		signal input
	Ec-	(4-20mAdc)
	FG	CVVS
	Tx+
	Tx-
	Rx+
	Rx-
	SG	Communication cable
	FG
	+24V	CVVS
	0V	Power supply cable
	FG

	Converter
	L1	CVV
Tx+	L2
TX-		CVVS
Rx+	AO+
Rx-	AO-
SG
	DI3
FG
	DI2
+24V
	COM2
0V	DO1
FG
	COM1
	DI
	COM	CVV
	FG

Power supply 100 to 240 Vac, 50/60Hz

Ground terminal (PE)

(Ground resistance 100 ohm or less)

Density (consistency) measurement output (4-20mAdc, 750 ohm max., isolated output)

Density multiplier switching voltage inputs

(H level: 20 to 30 Vdc, L level: 2 Vdc or less and Input

resistance: Approx. 3k ohm)

Density (consistency) measurement output (4-20mAdc, 750 ohm max., isolated output)

External synch. Control contact signal input (Contact capacity: 24Vdc, 0.1 to 1A)

Chassis ground terminal

(Ground resistance 100 ohm or less)

Ground terminal

(Ground resistance 100 ohm or less)

Notice 1: Do not connect to the “FG” terminals neither communication cable nor power supply cable in the detector side.

Notice 2: Either “PE” terminal on the terminal block in the converter on the chassis ground terminal of the unit should be grounded with 100 ohm or less ground.

Notice 3: Ground the shielded cable on the receiving instrument side.

Notice4: UL/CUL Hazardous locations type does not have a power switch. Please prepare a power switch outside. (Rated 250V AC,10A above, DPST: Double-Pole/Single-Throw)

Use the power switch for Hazardous locations in Hazardous locations area.

Figure 8. External connections

(8)As the cable port is made air-tight using a packing, tighten the cable gland securely when all the wiring is completed. If the diameter of the cable is smaller than the inside diameter of the packing, enlarge the cable diameter to the same size as the packing by wrapping valves around the cable Its suitable diameter is 11mm. Tighten the terminal screws securely. Its suitable torque is 1.0 to 1.7 N⋅m.

(9)Screws at the terminals are needed to tighten with 1.2 N·m torque (1.4 N·m is maximum).

(10)Do not turn on the power supply under the uninstalled condition.

(11)Each cable in the communication cable and power supply cable between detector and converter has a banded marks for each terminals. Connect them correctly without any mismatches.

•Wiring when communications function is used By connecting the cable lead of the optional AF900 hand-held terminal to the density (consistency) measurement output, you can operate the LQ500 from remote places.

1)Make sure the load resistance of 4-20mAdc line of output is between 240 and 750 ohm, and the load capacitance is 0.25µF maximum.

2)The AF900’s cable lead can be connected to

the LQ500 anywhere along the current output line. For example, the cable lead may be connected to the signal terminals on the receiving side in the control room. See Figure 9.

LQ500 converter Control room

Density meter output Instrument (load)

Hand-held terminal

AF900 (option)

Figure 9. Wiring for communication function

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