NORD CPS01 Safety-Reliable Power Supply for Critical Control Sites

NORD CPS01 Safety-Reliable Power Supply for Critical Control Sites

The NORD CPS01 is a dedicated power supply module engineered for NORDAC series variable frequency drives, designed to deliver uninterrupted, safety-grade power conditioning in the most demanding industrial control environments. In continuous production facilities, petrochemical plants, power generation stations, mining operations, and heavy metallurgical sites, control cabinet power integrity is not a convenience — it is a safety imperative. The CPS01 addresses this imperative directly, providing a stable, filtered, and surge-protected DC supply rail that keeps NORDAC drive control electronics operational even when the upstream AC network is subject to voltage sags, harmonic distortion, transient overvoltages, and high-frequency electromagnetic interference.

Industrial control cabinets housing NORDAC SK 500E, SK 700E, or SK 750E series drives are routinely exposed to conducted EMI from adjacent motor starters, contactor switching transients, and ground loop currents. Without a dedicated, isolated power supply module such as the CPS01, these disturbances can propagate directly into the drive’s control logic, causing parameter corruption, spurious fault trips, unintended relay outputs, and — in worst-case scenarios — uncontrolled motor runaway or emergency stop failures. The CPS01 eliminates this risk by providing a galvanically isolated, regulated supply that decouples the drive’s sensitive control circuitry from the noisy power environment of the cabinet.

For facilities operating under IEC 61508 or IEC 62061 functional safety frameworks, maintaining the integrity of the safety-related control path is non-negotiable. The CPS01 supports this requirement by ensuring that safety relay modules, emergency stop circuits, and interlock logic connected to the NORDAC drive receive clean, stable power at all times. Signal drift caused by supply voltage fluctuation — a common root cause of nuisance trips and false safe-state activations — is effectively suppressed, reducing both unplanned downtime and the risk of spurious safety function activation that can itself create hazardous conditions during process restart.

Safety Reliability Table

Control Cabinet Risk Reduction Strategy

A robust NORDAC drive installation is never a single-component solution. The CPS01 power supply module functions as the foundation of a layered control cabinet protection strategy. In high-risk continuous process environments, it is typically deployed alongside the NORDAC SK 700E or SK 750E main drive unit, which handles the primary motor speed and torque control. The CPS01 ensures that the drive’s internal control board, parameter memory, and fieldbus communication interface remain powered and stable even during brief AC supply interruptions or voltage dips that would otherwise trigger a drive fault and process shutdown.

Within the same cabinet, the CPS01 supply rail commonly feeds the NORD SK TU3-PBR PROFIBUS DP communication module or the SK TU3-PNT PROFINET IO adapter, ensuring that fieldbus communication between the drive and the plant DCS or PLC is maintained without interruption. Loss of fieldbus communication during a transient power event is a well-documented cause of process upsets in automated production lines; the CPS01 eliminates this failure mode by keeping the communication module continuously powered.

Safety relay modules such as the NORD SK CSX-3A safety option card — which implements STO (Safe Torque Off) and SS1 (Safe Stop 1) functions — depend on a stable 24 V supply to maintain their safe-state logic. Any supply ripple or dropout that causes the safety card to reset can result in an unintended STO activation, halting the drive and the connected process. The CPS01 prevents this scenario, maintaining the safety card’s supply within specification at all times.

In cabinets where multiple drives share a common DC bus, the NORDAC SK BRD brake resistor module and SK ECR energy recovery unit generate significant switching transients during regenerative braking events. These transients, if not properly managed, can couple into the control supply rail and cause signal errors in connected I/O modules, encoder interfaces, or PTC thermistor evaluation circuits. The CPS01’s integrated input filter and surge clamping circuitry absorbs these transients before they can affect the drive’s control electronics.

For installations in dusty, humid, or chemically aggressive environments — such as cement plants, wastewater treatment facilities, or offshore platforms — the CPS01 is often paired with NORD SK XU1 conformal coating option boards and SK TU3-ENC encoder feedback modules to create a complete, environmentally hardened drive system. The power supply module’s sealed construction and wide operating temperature range make it equally suitable for outdoor switchgear enclosures in port crane applications and for underground mining drive panels where condensation and vibration are constant challenges.

Critical Industrial Safety Applications

Petrochemical and Refinery Plants: In ATEX-classified zones, drive control systems must operate without interruption to maintain safe process conditions. The CPS01 ensures that NORDAC drives controlling pump motors, compressor auxiliaries, and agitator drives remain in controlled operation during grid disturbances, preventing uncontrolled process upsets that could lead to overpressure or hazardous material release.

Power Generation and Utilities: Auxiliary drive systems in thermal and hydroelectric power stations — including cooling water pumps, fuel feed conveyors, and ventilation fans — rely on uninterrupted drive control power. The CPS01 supports continuous operation through voltage sag events that are common during grid switching operations, preventing auxiliary system trips that could cascade into unit derating or forced outage.

Mining and Mineral Processing: Underground conveyor drives, hoist systems, and ventilation fan drives operate in environments with extreme dust loading, high humidity, and significant mechanical vibration. The CPS01’s robust construction and EMI filtering capability make it the preferred power supply module for NORDAC drives in these applications, where a control board failure caused by a power supply fault can result in both production loss and personnel safety risk.

Water and Wastewater Treatment: Pump station drives controlling raw water intake, chemical dosing, and effluent discharge must operate reliably 24/7. The CPS01 supports this requirement by providing a stable control supply that is immune to the switching transients generated by large pump motor starts and the harmonic distortion common in facilities with mixed drive and non-drive loads.

Metallurgy and Steel Production: Rolling mill drives, ladle transfer car drives, and fume extraction fan drives in steel plants are subject to extreme electromagnetic interference from arc furnaces and induction heating equipment. The CPS01’s galvanic isolation and high-frequency filtering capability protect the NORDAC drive’s control electronics from this interference, ensuring that speed references, torque limits, and safety interlock signals are processed accurately at all times.

Port and Marine Applications: Container crane drives, ship-to-shore conveyor systems, and vessel auxiliary drives require control systems that can withstand salt air corrosion, high humidity, and the mechanical shock loads associated with heavy lifting operations. The CPS01 is qualified for these environments and supports the reliable operation of NORDAC drives in marine and port infrastructure applications.

Safety and Quality FAQ

Q1: What does the 12-month warranty cover for the NORD CPS01?
The 12-month warranty covers all manufacturing defects, component failures, and functional deviations from the published specification under normal operating conditions. It applies from the date of shipment and includes replacement or repair of the module at no additional cost. Warranty claims are processed promptly to minimize your site downtime.

Q2: What pre-shipment testing is performed on each CPS01 unit?
Every CPS01 unit undergoes a 100% functional test prior to dispatch, including output voltage accuracy verification, isolation resistance measurement, and load regulation testing. Units that do not meet specification are quarantined and not shipped. A test record is available upon request for quality-critical installations.

Q3: Is the CPS01 compatible with all NORDAC drive series?
The CPS01 is designed and verified for use with the NORDAC SK 500E, SK 700E, SK 750E, and SK 200E series drives. Compatibility with other NORD drive families should be confirmed against the specific drive’s power supply module specification. Our technical team can assist with compatibility verification for your specific application.

Q4: Can long-term supply of the CPS01 be guaranteed for ongoing maintenance programs?
Yes. NINERMAS maintains dedicated stock of the CPS01 and other NORDAC series spare parts to support long-term maintenance and planned replacement programs. We specialize in sourcing original spare parts for legacy and current-production control systems, ensuring that your maintenance team has access to verified components when needed — not just at initial commissioning, but throughout the full operational life of your drive installation.