M-system MDPA-24 User manual

MODEL: MDPA-24
http://www.m-system.co.jp/ MDPA-24 SPECIFICATIONS ES-8258 Rev.5 Page 1/4
Lightning Surge Protectors for Electronics Equipment M-RESTER
LIGHTNING SURGE PROTECTOR
FOR STANDARD SIGNAL LINE & PULSE USE
Functions & Features
• Designed specifically for 4 – 20mA DC and
pulse signal line including both 4-wire and 2- wire
transmitters
• Life monitor function helps you to decide when you should
replace the surge protector; reduces maintenance and
prevents downtime
• Pressing CHK (Check) button confirms the degradation
and life span of the surge protection circuits with LEDs
• Absorbs surges only without affecting instrumentation
signal
• No interruption of signal by unplugging surge protector
element
M·RESTER
MADE IN JAPAN
SER.NO
BAT
ALM
MODEL
MODEL: MDPA–24[1]
ORDERING INFORMATION
• Code number: MDPA-24[1]
Specify a code from below for [1].
(e.g. MDPA-24/BN)
[1] OPTIONS
Configuration
blank: With Base (model: SK-2E) included
/BN : Element only for replacement
(Not selectable with DIN rail mounting adapter)
DIN rail mounting adapter
blank: Without
/A33: With adapter (model A-33)
RELATED PRODUCTS
• Base (model: SK-2E)
GENERAL SPECIFICATIONS
Construction: Plug-in
Connection: M4 screw terminals (torque 0.8 N·m)
Screw terminal: Nickel-plated steel
Housing material: Flame-resistant resin (black)
Indicators: Activated by CHK (Check) button, see the status
table shown below.
BAT: Green LED
ALM: Red LED
Degradation judged: When the leakage current at the
voltage limiter exceed approx. 7.5 μA.
Life time judged: When the number of discharges of the
discharge element reaches the expected life span.
CHK button: Push button; momentary
Battery: Lithium; No recharge or replacement available.
Battery life: 10 years (when used ≤ 2 minutes/month)
Normal
: ON
*1. With pulsating line signal or that containing ripples, the LED may
flicker or blink when the voltage limiter is degraded.
: OFF
Normal
Discharged
Normal
Near End
End of Life
Unable to Judge
Normal
Degraded*
1
No Need
Near
BatteryALMBAT Discharge
Element Voltage Limiter Replacement
Immediately
Required
Discharge element status table
INSTALLATION
Operating temperature: -5 to +55°C (23 to 131°F)
Operating humidity: 30 to 85 %RH (non-condensing)
Mounting: Surface or DIN rail
Weight: 150 g (0.33 lbs), standard
175 g (0.39 lbs), with DIN rail mounting adapter
PERFORMANCE
Max. continuous operating voltage (Uc):
Line to line: 30 V min
Line to earth: ±160 V min
Voltage protection level (Up):
• @ 1 kV (100 A)
Line to line: 45 V max.
Line to earth: ±650 V max.
• @ 2 kV (1 kA)
Line to line: 50 V max.
Line to earth: ±650 V max.
Response time:
Line to line: ≤ 4 nsec.
Line to earth: ≤ 20 nsec.
Leakage current:
Line to line: ≤ 5 μA @ 30 V DC
Line to earth: ≤ 5 μA @ ±140 V DC
Max. discharge current (Imax): 5000 A (8 / 20 μs)
Nominal current (IN): 100 mA
Internal series resistance: 20 Ω ±10 % (including return)
Capacitance @ 1 MHz:

MODEL: MDPA-24
http://www.m-system.co.jp/ MDPA-24 SPECIFICATIONS ES-8258 Rev.5 Page 2/4
Line to line: ≤ 1000 pF
Line to earth: ≤ 100 pF
STANDARDS & APPROVALS
Surge protection: IEC 61643-21 (Categories C1, C2)
EXTERNAL VIEW
P – P+
S
– S+
BAT Indicator LED
ALM Indicator LED
CHK Check Button
CONNECTION EXAMPLES
M-RESTER
IN
M-RESTER
CURRENT LOOP SUPPLY
CENTRAL
STATION
FIELD
(PROTECTED
EQUIPMENT)
FROM
FIELD
TO
CENTRAL
STATION
+
–
P–
P+
S–
S+
P–
P+
S–
S+
CABLE
G
G
+
–
G
GROUNDING
M-RESTER PROTECTED
EQUIPMENT
G
G
CROSSOVER WIRE
GROUNDING
(100 ohms or less)
A crossover wire between M-RESTER ground and the ground or
metallic housing of the equipment is required for protection.
If the protected equipment has no ground terminal, ground the
M-RESTER only.
When the M-RESTER is mounted with DIN Rail Mounting Adapter,
connect the grounding wire to the mounting screw of the M-RESTER.

MODEL: MDPA-24
http://www.m-system.co.jp/ MDPA-24 SPECIFICATIONS ES-8258 Rev.5 Page 3/4
EXTERNAL DIMENSIONS & TERMINAL ASSIGNMENTS unit: mm (inch)
P–P+
S–S+
23.5 (.93)
80 (3.15)
2–5 (.20) dia.
MTG HOLE
90 (3.54)
100 (3.94)
4–M4 TERMINAL SCREW
27 (1.06)53 (2.09)
80 (3.15)
27 (1.06)53 (2.09)
80 (3.15)
45 (1.77)
HEAD ELEMENT
BASE
GROUND TERMINAL (G)
(used as mounting bracket)
P–P+
S–S+
23.5 (.93)
80 (3.15) 90 (3.54)
100 (3.94)
4–M4 TERMINAL SCREW
■ WITH DIN RAIL MOUNTING ADAPTER
■ STADARD
DIN RAIL
35mm wide
45 (1.77)
4(.16)
8.5
(.33) [3.3 (.13)]
2–M4 MOUNTING SCREW
(used as ground terminal (G))
1 (.04)
1 (.04)
MOUNTING REQUIREMENTS unit: mm (inch)
25 (.97) MIN. 2–M4 SCREW
90 (3.54)

MODEL: MDPA-24
http://www.m-system.co.jp/ MDPA-24 SPECIFICATIONS ES-8258 Rev.5 Page 4/4
SCHEMATIC CIRCUITRY & CONNECTION DIAGRAM
BASE
+
CABLE
SIDE
S+
–
P
P
S
G
–
20Ω
ELEMENT
Battery
CHK
Check
Button
Voltage Limiter
GROUND TERMINAL
(used as mounting attachment)
Surge
Counter
Leakage Current
Detector
CT
BAT
(green)
ALM
(red)
EQUIPMENT
SIDE
Discharge
Element
*
*The zenor diode has polarity.
Zero-cross signal cannot be connected.
Specifications are subject to change without notice.