MEX-D
P. 3 / 3
EM-4616 Rev.7
CHECKING
1) Terminal wiring: Check that all cables are correctly
connected according to the connection diagram.
2) Power input voltage: Check voltage across the terminal 7
–␣ 8 with a multimeter.
3) Input: Check voltage across the terminals 5 (+) – 6 (–) to
show within 0.4 to 2V.
4) Feedback signal: Check voltage across the terminals 10 –
11 to show within 80 to 400mV.
5) Output: Check voltage across the output terminals.
Output Operation
ON:
≤
2V AC across the output terminals
OFF: 60 – 280V AC across the output terminals
When deviation between the setpoint and the position is
narrower than deadband, the output terminals show the
status equal to ‘SET = POS.’
ADJUSTMENTS
■
CONNECTING TO THE MOTOR
The motor must be connected carefully considering the rela-
tion between the motor’s rotating direction and the feedback
signal. If the connection is inappropriate, the MEX, upon
startup, drives the motor until it hits either end of span with
no control capability in midspan.
■
DEADBAND
The deadband is factory set to the maximum value (20%).
Turn the adjustment counterclockwise until hunting stops.
Adjustable within 2 to 20%.
■
MOTOR POSITIONING
0% Position
Apply 0% setpoint signal and adjust the 0% output position
with Zero Adjustment. Adjustable within 0 to 25%.
100% Position
Apply 100% setpoint signal and adjust the 100% output
position with Span Adjustment. Adjustable within 75 to
100%.
POWER
ON
OFF
OUT. TERM. SET < POS SET = POS SET > POS
–
1 – 3
OFF
OFF
ON
OFF
2 – 3
ON
OFF
OFF
OFF
■
TIMER
Set minimum interval for open/close operation, used for
protecting control motor from too frequent open/close opera-
tion. Adjustable to 1 – 30 seconds.
Deadband adjustment can realize similar effects. Combine
these two functions according to the control loop characteris-
tics to minimize the motor’s operation and prevent it from
overheating and wearing unnecessarily.
MAINTENANCE
Regular calibration procedure is explained below:
■
CALIBRATION
Confirm the motor position at 0%, 50% and 100% input
signals.
LIGHTNING SURGE PROTECTION
In order to product the unit from lightning surges entering
through power supply cables, use of appropriate Lightning
Surge Protectors are recommended. Please contact M-Sys-
tem.
M-SYSTEM WARRANTY
M-System warrants such new M-System product which it manufactures to be free from defects in materials and workmanship during the 36-month period following the date that such
product was originally purchased if such product has been used under normal operating conditions and properly maintained, M-System's sole liability, and purchaser's exclusive remedies,
under this warranty are, at M-System's option, the repair, replacement or refund of the purchase price of any M-System product which is defective under the terms of this warranty. To
submit a claim under this warranty, the purchaser must return, at its expense, the defective M-System product to the below address together with a copy of its original sales invoice.
THIS IS THE ONLY WARRANTY APPLICABLE TO M-SYSTEM PRODUCT AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. M-SYSTEM SHALL HAVE NO LIABILITY FOR CONSEQUENTIAL, INCIDENTAL OR
SPECIAL DAMAGES OF ANY KIND WHATSOEVER.
M-System Co., Ltd., 5-2-55, Minamitsumori, Nishinari-ku, Osaka 557-0063 JAPAN, Phone: (06) 6659-8201, Fax: (06) 6659-8510, E-mail: [email protected]
