Yokogawa ISC450 4-Wire Analyzer for Inductive Conductivity - Manual (Page 18)

10
IM 12D06D05-01E
3-3-5. Grounding the housing
For the safety of the user and to protect the
instrument against interference, the housing
must always be connected to ground. This has
to be done by a large area conductor. This
cable can be fixed to the rear of the housing or
by using the internal ground connections using
a braided wire cable. See figure 3-8.
The minimum cross sectional area of the pro-
tective grounding wire should be 0.75 mm 2 .
3-3-6. Switching on the instrument
After all connections are made and checked,
the power can be switched on from the power
supply. Make sure the LCD display comes on.
After a brief interval, the display will change to
the measured value. If errors are displayed or
a valid measured value is not shown, consult
the troubleshooting section (Chapter 8) before
calling Yokogawa.
DANGER
Figure 3-7. Input and output connections
63 66 65 61 22 21 12 16 15
- + - +
mA OUTPUTS
62 11 17
TEMP mA2
SHLD
CONTACT SENSOR(S)
REFER TO INSTRUCTION MANUAL FOR CONNECTIONS ISC
mA1
(+HART)
14
COILS
RECEIVE DRIVE SHLD + -
13
32 31 33 42 41 43 52 51 53 72 71 73
NC C NO NC C NO NC C NO NO C NC
S1 S2 S3 CONTACTS S4
250V / 5A
AC / DC
100VA / 50W
(fail-safe)
2 1
- +
DC
POWER
12-24 V /10 W
FUSE: 2A/250 VAC/T
2 1
N L
AC
POWER
100-240 VAC/15 VA/ 50/60Hz
FUSE: 500 mA/250 VAC/T
Fuse replacement should be performed only by
a qualified service person.
See Sec.7. MAINTENANCE, Fuse.
Fuse ratings:
Power supply Fuse type
12-24VDC, 10W max 2A/250V, Slow
100-240VAC, 15VA max 0.5A/250V, Slow
3-3-2. Access to terminal and cable entry
Terminals 1 and 2 are used for the power sup-
ply. Guide the power cables through the gland
closed to the power supply terminals. The ter-
minals will accept wires of 2.5 mm
2
(14 AWG).
Always use cable finishings if possible.
WARNING 3-3-3. AC power
Connect terminal L to the phase line of the
AC power and terminal N to the zero line. See
figure 3-8 for the power ground.
3-3-4. DC power
Connect terminal 1 to the positive outlet and
terminal 2 to the negative outlet.
The size of conductors should be at least 1.25
mm 2 . The overall cable diameter should be
between 7 & 12 mm.