M-system B5RS Instruction Manual page 2

TERMINAL CONNECTIONS
Connect the unit as in the diagram below or refer to the
connection diagram on the front of the unit.
■ EXTERNAL DIMENSIONS unit: mm (inch)
7.3 (.29)
1 2
3 4
5 6
7 8
25 (.98)
• When mounting, no extra space is needed between units.
■ CONNECTION DIAGRAM
RTD
4
A
3
B
2
B
*DC ammeter's internal resistance 10 ohms max.
WIRING INSTRUCTIONS
■ SCREW TERMINAL
Torque: 0.8 N·m
8–M3.5 SCREW
DIN RAIL
35mm wide
41 (1.61) [3.3 (.13)]
8 –
–
*
MONITOR mA
7 + +
24V DC
5 +
OUTPUT LOAD
6 –
4 – 20mA DC
5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN
Phone: +81(6)6659-8201 Fax: +81(6)6659-8510 E-mail: info@m-system.co.jp
CHECKING
1) Terminal wiring: Check that all cables are correctly con-
nected according to the connection diagram.
2) Input: Check voltage across the terminal 4 – 3 with a
sensitive voltmeter (With 20°C or 68°F, approx. 70mV
with Pt 100, approx. 35mV with Pt 50Ω).
If RTD wires are broken, the output goes over 100% (be-
low 0% with downscale) due to burnout function. Check
leadwires in such a case.
3) Output: Check that the load is within the permissible
limit including wiring resistance.
Load Resistance (Ω) =
4) When you check the output signal, connect an ammeter
of which the internal resistance is of 10Ω max. to the
monitor terminals.
ADJUSTMENT PROCEDURE
This unit is calibrated at the factory to meet the ordered
specifications, therefore you usually do not need any cali-
bration.
For matching the signal to a receiving instrument or in case
of regular calibration, adjust the output as explained in the
following.
■ 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.
1) ZERO: Apply 0% input and adjust output to 0%.
2) SPAN: Apply 100% input and adjust output to 100%.
3) Check ZERO adjustment again with 0% input.
4) When ZERO value is changed, repeat the above proce-
dure 1) – 3).
MAINTENANCE
Regular calibration procedure is explained below:
■ CALIBRATION
Warm up the unit for at least 10 minutes. Apply 0%, 25%,
50%, 75% and 100% input signal. Check that the output
signal for the respective input signal remains within accu-
racy described in the data sheet. When the output is out of
tolerance, recalibrate the unit according to the "ADJUST-
MENT PROCEDURE" explained earlier.
LIGHTNING SURGE PROTECTION
M-System offers a series of lightning surge protector for
protection against induced lightning surges. Please contact
M-System to choose appropriate models.
B5RS
Supply Voltage (V) – 12 (V)
0.02 (A)
(including leadwire resistance)
EM-1518 Rev.4 P. 2 / 2