Wiring Instructions; Adjustment Procedure - M-system 35mm Instruction Manual

WIRING INSTRUCTIONS

■ SCREW TERMINAL
Torque: 0.8 N·m
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal
7 – 8 with a multimeter.
3) Output: Check that the load resistance meets the de-
scribed specifications.

ADJUSTMENT PROCEDURE

This unit is calibrated at the factory with the total resist-
ance input, therefore you do not need any calibration if you
use the potentiometer's total resistance.
When you do not use the total resistance or in case of regu-
lar calibration, adjust the output as explained in the follow-
ing. Zero and span are adjusted with using the Program-
ming Unit (model: PU-2x).
Refer to the Operation Manual for Model PU-2x for expla-
nations how to use the programmer.
■ WARNING ON USE OF THE PROGRAMMING UNIT
• Be sure to disconnect the Programming Unit before you
turn on/off power supply to the unit.
• The output signal is held when the Programming Unit is
connected. You need to disconnect when confirming cur-
rent output values.
■ HOW TO CALIBRATE THE OUTPUT SIGNAL
Use a signal source and measuring instruments of sufficient
accuracy level. Turn the power supply on and warm up for
more than 10 minutes.
• Calibrating the Output Range Proportionally to the Ac-
tual Input Resistance Range
The output range can be calibrated for input ranges nar-
rower than the total resistance, to match the actual input
resistance range, by using the linearization table (ITEM 60
through 91) to compensate unused resistance ranges (See
the following figures).
If upper and lower overranges need not to be considered,
only two calibration points will suffice.
OUTPUT
100%
Y(02)
Y(01)
0%
X(01) X(02)
(a) (b)
Figure 1. Unused Resistance
MG CO., LTD. www.mgco.jp
5-2-55 Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
(a), (c) : Unused Resistance
= (Total Resistance – Input Resistance)
(b) : Input Resistance
= Actual Resistance Range
INPUT
100%
(c)
OUTPUT
Y(02)
0%
Y(01)
X(01)
(b)
Figure 2. Example of Linearization
1) Confirm actual lower-range and upper-range resistance
in percentage against the total resistance range 0 – 100%.
In order to do this, provide actual resistance values and
confirm them on the Programming Unit (ITEM 05: Input
Status Monitor in %).
2) Turn the unit into Program mode (ITEM 01).
3) Enable use of the linearization table (ITEM 10: Pm-2:
curved).
4) Set the lower-range input in % at ITEM 60.
5) Set the lower-range output in %, usually '0' (zero), at
ITEM 61.
6) Set the upper-range input in % at ITEM 62.
7) Set the upper-range output in %, usually '100', at ITEM
63.
Table 1 shows an example of settings when you need to use
10 – 90% of the total resistance and calibrate this range to
0 – 100%.
Table 1. Setting Example
[GROUP 01]
ITEM MDFY. DATA INPUT
01 S 1
60 P 10.00
61 P 0.00
62 P 90.00
63 P 100.00
Modification Code
S: Modifiable at any time.
P: Modifiable only when the MAINTENANCE SWITCH is in
the "PRG" mode.
HJM
100%
(b) : Input Resistance
= Actual Resistance Range
INPUT
X(02)
DATA EXAMPLE
MTSW : PRG. MODE
X (01) : 10.00
Y (01) : 0.00
X (02) : 90.00
Y (02) : 100.00
EM-3465 Rev.11 P. 3 / 5