M-system AS4LC, Instruction Manual

Page: 6 / 6

AS4LC
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
EM-1601 Rev.7 P. 6 / 6
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 – 14 with a multimeter.
3) Strain gauge: Maximum allowable current supplied to
the strain gauge is 30 mA. Check the resistance of the
sensor.
4) Input: Check voltage across the terminal 4 (+) – 12 (–)
with a multimeter. The voltage value at the maximum
load must equal [Excitation × Strain Gauge Sensitivity].
5) Alarm operations: Check the alarm operations referring
to the figure below.
6) Output load: Check that the output load is 380 V AC /
120 VA or 125 V DC / 30 W (≤ 0.5 A for CE) at the maxi-
mum. For maximum relay life with inductive load, exter-
nal protection is recommended.
0 50 100
▲
Input
(%)
LL L
▲ ▲
HH H
L2 (15–8)
ON
▲
L3 (10–8)
ON
L4 (1–8)
ON
OFF
OFF
L1 (9–8)
ON
OFF
OFF
Alarm Trip Operation
Terminal No. in parentheses
Example with quad N.O. contacts (LL, L, H, HH)
Trip Operation in Power Failure
• Output code 2: All relays turn off.
• Output code 3: All relays turn on.
• Output code 5: Terminals 15 – 8, 1 – 8 turn on.
MAINTENANCE
Regular calibration procedure is explained below:
■
CALIBRATION
Warm up the unit for at least 10 minutes.
• H (HH) Setpoint
Increase the input signal from a value lower than the set-
point and check that the relay trips at the H (or HH) set-
point within the setpoint accuracy described in the data
sheet.
• L (LL) Setpoint
Decrease the input signal from a value higher than the
setpoint and check that the relay trips at the L (or LL)
setpoint within the setpoint accuracy described in the
data sheet.
When the setpoints are shifted, please contact M-System’s
Sales Office or representatives.
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.