SAM Electronics DZM402 Speed Relay Module
SAM Electronics
New product
The SAM Electronics DZM402 Speed Relay Module is a central engine-speed processing and protection module used in marine propulsion safety systems.
The supplied SM MARINE SERVICE™ photograph clearly shows the board identified as:
DZM402 / Drehzahl-Relais-Modul / SPEEDRELAY-MODULE
SAM Electronics documentation describes DZM402 as the central module of the EPS 2200-MAN Engine Protection System. The module contains the system software, performs engine speed measurement, processes speed pick-up inputs and carries out overspeed monitoring.
DZM means:
Drehzahl-Relais-Modul
which in English means:
Speed Relay Module
The DZM402 is designed for applications where rapid and reliable speed measurement from engine pick-ups is necessary.
SAM specifically describes applications such as:
Large diesel engine safety systems
Main engine control systems
Marine propulsion engine protection
The module is particularly important because it handles both speed measurement and overspeed protection within the engine safety architecture.
In SAM's EPS 2200-MAN Engine Protection System, DZM402 is described as the central electronic module.
The wider system includes:
DZM402 – Speed Relay Module
IOM402 – Input / Output Module
FIM405 – Filter Module
Operating Panel
The DZM402 stores the software and parameter information needed by the engine safety system and performs critical speed-related functions.
For SAM Electronics and Lyngsø Marine propulsion-control spare parts, SM MARINE SERVICE™ supports worldwide sourcing through www.smmarineservice.com.
The DZM402 receives speed information from engine-mounted speed pick-up sensors.
Two of its galvanically isolated digital inputs are dedicated specifically to these pick-up signals.
SAM describes the module as having:
4 galvanically decoupled digital inputs
with:
2 inputs assigned to speed pick-ups.
These pick-up signals allow the module to calculate actual engine RPM and monitor overspeed conditions.
One of the most important functions of the DZM402 is:
Overspeed can be dangerous for a large marine diesel engine.
If the measured engine speed exceeds the permitted overspeed limit, the DZM402 participates in the emergency shutdown logic of the Engine Protection System.
SAM documentation specifically identifies the DZM402 as responsible for:
speed sensing
and:
overspeed monitoring.
This makes DZM402 a safety-critical propulsion-control component.
The DZM402 does more than monitor speed internally.
It also provides speed signals to external indicating instruments.
SAM documents:
Two ±10 V analogue speed outputs
and one output can additionally provide:
0/4–20 mA current output.
This allows the engine speed signal to be displayed at several vessel locations.
SAM's system documentation shows DZM402 speed indication being distributed to locations such as:
ECR Console
Local Control Box
Bridge Console
Bridge Wing Stations
Chief Engineer / Engine Room indication points
depending on vessel configuration.
This is why a DZM402 fault can sometimes cause loss of RPM indication at several places simultaneously.
The DZM402 also has a direct local speed-indication function.
SAM documentation states that the measured speed can be shown on a 4-digit display at the DZM402 itself, with negative values indicating astern running.
This provides engineers with a useful local diagnostic reference.
The DZM402 contains:
4 relays
and:
2 solid-state relays.
These outputs are used for control/protection functions related to engine speed and safety logic.
The exact output assignment depends on the specific SAM system configuration.
DZM402 also appears in the earlier/related:
The DPS 2100 manual similarly describes DZM402 as the system's central module, responsible for speed sensing and overspeed monitoring.
This makes the following related keywords useful:
SAM DPS2100 DZM402
Lyngsø DPS2100 Speed Relay
DZM402 Engine Safety System
The Engine Protection System provides engine shutdown functions when configured safety limits are exceeded.
The DZM402 contains fixed speed-measurement channels and fixed outputs for speed indication and emergency overspeed shutdown, while configurable shutdown signals are handled through the IOM402 modules.
This architecture separates:
speed / overspeed protection
from:
general machinery shutdown inputs
while still keeping them within the same engine protection system.
SAM documentation also refers to a one-turn counter signal used for slow-turning applications and stroke counting.
The signal is generated after one complete engine revolution in a continuous direction.
This can be useful in engine preparation and slow-turning monitoring logic.
The DZM402 normally works together with one or more:
SAM describes IOM402 as having:
16 digital inputs
and:
12 solid-state outputs
with line-break monitoring.
IOM402 handles the wider machinery safety inputs, while DZM402 performs the central processing and speed/overspeed-related functions.
Another associated module is:
The FIM405 forms part of the EPS/DPS system's power and filtering architecture.
Because these modules operate as a system, a failure that appears to be a DZM fault may sometimes be caused by supply, communication or associated I/O issues.
The DZM402 communicates with the Engine Protection System Operating Panel.
The operator can use the panel to access:
Actual operating values
Alarm information
Input status
Parameters
Protection settings
SAM documentation states that the parameter list is stored in the central DZM402 module.
The SAM DZM402 is relevant to:
Check:
Speed pick-up sensors
Pick-up cable condition
DZM402 input connections
Pickup polarity/configuration
Module power supply
SAM troubleshooting documentation specifically includes alarms for:
PICK UP 1 FAULT
PICK UP 2 FAULT
PICK UP 1 WB
PICK UP 2 WB
where WB refers to wire breakage.
For a pick-up wire-break alarm, SAM recommends checking the cabling between the speed pick-up and the DZM402 and verifying the appropriate jumper configuration.
Possible areas to inspect include:
Damaged pick-up sensor
Incorrect air gap
Loose wiring
Electrical noise
Poor grounding/shielding
DZM402 input circuit
Check the DZM402 analogue output circuits and the downstream indication wiring.
The module provides multiple speed-output paths, so one indication circuit can fail while another remains active.
Check:
Output configuration
Loop wiring
Receiving instrument
Current-output circuit
Do not assume the DZM402 is defective until the external loop has been verified.
If an overspeed trip occurs unexpectedly, verify:
Actual engine RPM
Speed pick-up signals
Overspeed setting
DZM402 parameter configuration
Input signal stability
Because overspeed shutdown is a critical engine-safety function, settings should not be altered without approved vessel procedures.
SAM documentation describes a:
“CONNECTION LOST”
alarm when serial communication between the Operating Panel and DZM402 is lost.
Recommended checks include:
DZM402 watchdog status
Communication cabling
Operating Panel address/jumper settings
DZM402 jumper settings.
The DZM402 incorporates watchdog supervision.
If the watchdog is not active or the module fails to initialize correctly, communication and engine protection functions may be affected.
In some cases, replacement of the DZM402 or Operating Panel may be required after wiring and configuration checks.
Before ordering a SAM DZM402 replacement, confirm:
Manufacturer: SAM Electronics / Lyngsø Marine
Model: DZM402
Description: Drehzahl-Relais-Modul / Speed Relay Module
System: EPS 2200-MAN / DPS 2100 or applicable system
Hardware Revision: verify label / PCB
Part Number: verify from exact module label
Software / Parameters: verify before replacement
Pick-Up Type: verify
Connector Layout: match original
Front and rear photographs: recommended
This is important because visually similar SAM modules may belong to different revisions or control-system generations.
SM MARINE SERVICE™ supplies and sources SAM Electronics DZM402 Speed Relay Modules, IOM402 Input/Output Modules, FIM405 Filter Modules, Operating Panels and other SAM / Lyngsø Marine engine protection and propulsion-control spare parts.
Relevant enquiry references include:
DZM402
DZM 402
Drehzahl-Relais-Modul
Speed Relay Module
EPS 2200-MAN DZM402
DPS 2100 DZM402
SAM Engine Protection System
SAM Engine Safety System
Available condition may include:
New • Used • Refurbished • Reconditioned • Tested Working
For worldwide SAM Electronics marine automation spare-parts sourcing, visit www.smmarineservice.com.
DZM402 is a Speed Relay Module used as the central speed-processing and overspeed-protection module in SAM marine engine safety/protection systems.
It comes from the German Drehzahl-Relais-Modul, meaning Speed Relay Module.
Yes. SAM documentation identifies it as the central module of the EPS 2200-MAN Engine Protection System.
Yes. DPS 2100 documentation also lists DZM402 as its central Speed Relay Module.
It measures main-engine speed using speed pick-up inputs.
Yes. Overspeed monitoring is one of its principal documented functions.
The module has four galvanically isolated digital inputs, with two dedicated to speed pick-ups.
Yes. The manual documents two ±10V outputs, with one also capable of providing 0/4–20 mA.
SAM documentation states that DZM402 has four relays and two solid-state relays.
The same engine protection architecture includes IOM402, FIM405 and an Operating Panel.
SM MARINE SERVICE™ supplies and sources SAM Electronics / Lyngsø Marine engine protection and propulsion-control equipment for worldwide customers.
SAM Electronics / Lyngsø Marine DZM402 Drehzahl-Relais-Modul / Speed Relay Module for EPS 2200-MAN and DPS 2100 marine Engine Protection / Engine Safety Systems. The DZM402 is the central module for main engine speed sensing, overspeed monitoring, emergency shutdown logic and RPM indication. Official documentation specifies four galvanically isolated digital inputs including two pick-up inputs, two ±10V speed outputs, 0/4–20mA current output capability, four relays and two solid-state relays. New, Used, Refurbished and Reconditioned DZM402 and related SAM IOM402 / FIM405 spare parts available from SM MARINE SERVICE™ with worldwide shipping and technical support.
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