YOKOGAWA UTAdvanced UT55A, Руководство пользователя

Страница: 376 / 476

17-7
IM 05P01C31-01EN
Installation and W
iring
17
17.4.2 PV Input Wiring
CAUTION
1) Be careful of polarity when wiring inputs. Reversed polarity can damage the UT.
2) Keep the PV input signal line as far away as possible from the power supply
circuit and ground circuit.
3) For TC input, use shielded compensating lead wires for wiring. For RTD input,
use shielded wires that have low conductor resistance and cause no significant
differences in resistance between the three wires.
4) If there is a risk of external lightning surges, use a lightning arrester etc.
UT55A/UT52A
TC Input RTD Input (3-wire system)
203
202
TC
–
+
Compensating lead wire
Class D grounding
(grounding resistance
of 100 Ω or less)
Shield
PV
203
202
201
RTD
A
B
b
Lead wire resistance per wire of
10 Ω or less. Make the resistance
of the three wires equal.
A
b
B
Class D grounding
(grounding resistance
of 100 Ω or less)
Shield
PV
DC Voltage (mV, V) Input DC Current (mA) Input
203
202
–
+
+
–
DC voltage
Class D grounding
(grounding resistance of 100 Ω or less)
Shield
PV
204
203
–
+
+
–
DC current
Class D grounding
(grounding resistance of 100 Ω or less)
Shield
PV
Use
In Single-loop control, Cascade primary-loop control, Cascade secondary-loop control,
Loop control for backup, or Loop control with PV-hold function, PV input is used for PV
input.
In Loop control with PV switching or Loop control with PV auto-selector, PV input is used
for PV input 1. Remote input (E1-terminal area) is used for PV input 2. In Loop control
with PV auto-selector for 3 inputs or 4 inputs, auxiliary analog inputs are used for PV
input 3 and PV input 4.
In Cascade control, PV input is used for Loop-1 PV input. Remote input (E1-terminal
area) is used for Loop-2 PV input.
17.4 Wiring