Yamatake SDC35, User Manual

Page: 66 / 280

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Zener barrier adjustment
When the PV input is RTD and uses the Zener barrier, the Zener barrier needs to
be adjusted. Additionally, if three wiring resistances to the PV input terminal have
any variation even though the Zener barrier is not used, the Zener barrier must also
be adjusted.
When using an input other than RTD, this adjustment is not needed and cannot be
performed.
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Adjusting procedures
Follow the steps below to adjust the Zener barrier.
(1) Turn OFF the power to the unit and make any of the wiring status 1 to 3 while
referring to the Table below.
5-8
Chapter 5. DETAILED DESCRIPTION OF EACH FUNCTION
Item (Bank) Display Contents Initial value User level
Special function
(Setup bank) 0 to 15
5: Zener barrier adjustment enabled. 0
(This value
becomes zero (0)
when the power is
turned ON.)
High function
Zener barrier adjustment
(Setup bank) 0.00
Ω
–20.000 to +20.00
Ω
(However, “–20.00” is displayed as “–19.99”.)
The value can be changed with the
adjustment.
The numeric value cannot be directly input
with the manual operation.
Applicable PV range type Wiring status Wiring contents
41, 42, 45, 46, 65 to 68 1 Make A and B short-circuited with the RTD
terminal.
41 to 52, 63 to 68 2 Remove the RTD, connect 100.00
Ω
-resistor
to A and B of the Zener barrier, and make B
and C short-circuited.
41 to 68 3 Remove the RTD at the top of the long
extension wiring, connect 100.00
Ω
-resistor to
A and B of the Zener barrier, and make B
and C short-circuited.
High function