Toshiba Density (Consistency) Meter LQ500 User Manual page 7

CVVS
Conductivity
Ec+
signal input
RF part
Ec- (4-20mAdc)
FG
Tx+
Tx-
Rx+
Rx-
SG
Communication cable
FG
+24V
0V
Power supply cable
FG
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.
(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
Converter
L1
L2
CVVS
Tx+
TX-
Rx+
AO+
Rx-
AO-
SG
DI3
FG
DI2
CVVS
+24V
COM2
0V
DO1
FG
COM1
DI
COM
FG
Figure 8. External connections
CVV
Power supply 100 to 240 Vac, 50/60Hz
Ground terminal (PE)
(Ground resistance 100 ohm or less)
CVVS
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)
CVV
Chassis ground terminal
(Ground resistance 100 ohm or less)
Ground terminal
(Ground resistance 100 ohm or less)
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
Density meter output
Hand-held terminal
AF900 (option)
Figure 9. Wiring for communication function
LQ500
Control room
Instrument (load)
7