Question 1

How should the physical bus and termination resistors be verified when the Smartpack controller reports a 'CAN Node Disconnected' fault for this module?

Accepted Answer

Power down or isolate the communication segment and measure the DC loop resistance between CAN_H (pin 4) and CAN_L (pin 5) using a calibrated multimeter. A properly terminated bus must measure approximately 60 Ohms, representing two 120-Ohm end-of-line resistors in parallel. If the reading is ~120 Ohms, one end-of-line terminator is missing; if open or near 0 Ohms, inspect the RJ45 cabling for short circuits or open pairs. Additionally, verify via the Smartpack configuration software that no node ID collision exists with adjacent nodes.

Question 2

How are the 4 analog inputs configured for Battery Symmetry monitoring, and what are the strict common-mode voltage wiring restrictions?

Accepted Answer

In the Smartpack GUI, map the desired analog channel to 'Symmetry'. The differential input channels share a common ground reference with the node. While inputs tolerate site floating DC common-mode levels up to nominal rail potentials, the differential voltage across any symmetry input pair must remain within its specified full-scale input envelope (typically ±5V or ±10V deviation around midpoint). In systems exceeding 60V nominal (e.g., 110V/220V substations), direct wiring to high-potential midpoints will saturate or destroy the internal analog front-end; external voltage divider boxes must be inserted.

Question 3

What surge protection and wiring precautions are required when the 4 relay outputs drive inductive loads such as high-current DC contactor coils?

Accepted Answer

The onboard relays are rated for low-voltage signal levels (max 60VDC / 1A resistive). When driving inductive loads such as LVD contactor coils, generator solenoid actuators, or external interposing relays, an external flyback suppression diode (e.g., fast-recovery or 1N4007) MUST be installed antiparallel across the DC coil terminals, or an appropriately rated MOV/RC snubber for AC. Omitting this allows back-EMF inductive voltage spikes (often exceeding 400V) to arc across the relay contacts, resulting in contact welding, PCB track degradation, and localized CAN transceiver lock-up.

Eltek I/O CAN Node Controller (242100.120)

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Battery string symmetry and thermal monitoring across multiple battery banks

Site environmental aggregation including door entry, flood, fire, and SPD failure alarms

External control interfacing for genset start/stop sequencing and auxiliary contactor trips

Frequently asked questions

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Eltek I/O CAN Node Controller (242100.120)

What this product is

What this product is

What problem it solves

Who and where it is for

Core advantages

Technical specifications

Applications

Battery string symmetry and thermal monitoring across multiple battery banks

Site environmental aggregation including door entry, flood, fire, and SPD failure alarms

External control interfacing for genset start/stop sequencing and auxiliary contactor trips

Frequently asked questions

How should the physical bus and termination resistors be verified when the Smartpack controller reports a 'CAN Node Disconnected' fault for this module?

How are the 4 analog inputs configured for Battery Symmetry monitoring, and what are the strict common-mode voltage wiring restrictions?

What surge protection and wiring precautions are required when the 4 relay outputs drive inductive loads such as high-current DC contactor coils?

Following hardware replacement of a 242100.120 module, the master controller fails to map its I/O assignments. What rediscovery and remapping sequence must be followed?

Continue exploring

Eltek 252189 Subrack Telecom DC Power System (-48V 4-Slot Flatpack2)

Eltek Flatpack2 24/2000 HE High Efficiency Rectifier Module (241115.205)

Eltek Flatpack2 48/2000 WOR HE High Efficiency Rectifier Module (241115.805)

Eltek Flatpack2 48/3000 WOR HE Rectifier Module (241115.705)