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CMS460


LINETRAXX® CMS460-D
Multi-channel AC, pulsed DC sensitive load current evaluator
for AC systems (TN, TT and IT systems)

 

BENDER over/under current AC relay CMS460

Product description:

The CMS460 system consists of one or several CMS460-D load current evaluators which are able to detect and evaluate load currents in earthed and unearthed power supplies via the associated measuring current transformers. The maximum voltage of the system to be monitored depends on the nominal insulation voltage of the measuring current transformer used in the case of busbar systems, or on the cables or conductors that are routed through.
W… (closed), WR… (rectangular) and WS… (split-core) and WF… (flexible) measuring current transformers are used for alternating and pulsating currents. Any combination of the various measuring current transformer series can be connected to the evaluator measuring channels. Each CMS460-D utilises 12 measuring channels. Up to 90 load current evaluators can be connected via a BMS bus (RS-485 interface with BMS protocol), thereby up to 1080 measuring channels (sub-circuits) can be monitored.
If this product is to be used for fire or plant protection, the frequency response can be set accordingly. The measured currents can be analysed for harmonics.


Device features:

• Optional AC or pulsed DC sensitive measurements for each channel
• r.m.s. value measurement
• 12 measuring channels per individual device for load current
• Up to 90 evaluators CMS460-D in the system (1080 measuring channels)
• Fast parallel scanning for all channels
• Response ranges 100 mA…125 A (42…2000 Hz)
• Preset function
• Adjustable time delays
• Adjustable frequency behaviour (e.g. fire and plant protection)
• History memory with date and time stamp for 300 data records/channel
• Data logger for 300 data records/channel
• Analysis of the harmonics, THD
• Two alarm relays with one changeover contact each
• N/O or N/C operation and fault memory selectable
• Connection external test and reset button
• Backlit graphical display (7-segment display) and alarm LEDs
• Data exchange via BMS bus
• Password protection for device setting
• RoHS compliant

Application:

• Monitoring of loads and installations for load currents in the frequency range of 42…2000 Hz (measuring current transformers W…, WR…, WS…, WF…)
• Monitoring of currents regarded as fire hazards in flammable atmospheres
• EMC monitoring of TN systems for “stray currents” and additional N-PE connections
• Monitoring of N conductors for overload caused by harmonics
• Monitoring of PE and equipotential bonding conductors to ensure they are free of current

Function:

The currents are detected and evaluated as true r.m.s. values in the frequency range of 42…2000 Hz. All channels are scanned simultaneously so that the maximum scanning time for all channels is ≤ 180 ms if 1x the response value is exceeded and ≤ 30 ms if 5x the response value is exceeded.
The current values of all channels are shown on the LC display in bar graph format. If one of both values falls below or exceeds the set response value, the response delay ton begins.
Once the response delay has expired, the common alarm relays “K1/K2” switch and the alarm LEDs 1/2 light up.
Two response values/common alarm relays, which can be set separately, allow a distinction to be made between “prewarning” and “alarm”. The faulty channel(s) and the associated measured value are shown on the LC display. If the current exceeds or falls below the release value (response value plus hysteresis), the delay on release toff begins. Once the delay has expired, the common alarm relays return to their original position.
If the fault memory is enabled, the common alarm relays remain in the alarm position until the reset button is pressed or a reset command is sent via the BMS bus. The device function can be tested using the test button. Parameters are assigned to the device via the LCD and the control buttons on the front of the connected CMS460-D or via connected panels and protocol converters (e.g. FTC470XET).
The preset function allows the response values to be set for all channels considering the currently measured value for each channel.
The CMS460-D utilises a backlit graphical display where detailed information of all devices connected to the bus are displayed. This device is capable of assigning parameters to all CMS460-D devices connected to the bus (e.g. RCMS460-D/-L, RCMS490-D/-L, CMS460-D) and displaying all measurement details. Several CMS460-D devices can be used in one system.

History memory:

The device utilises a history memory for failsafe storing of up to 300 data records (date, time, channel, event code, measured value), so that all data about an outgoing circuit or an area can be traced back at any time (what happened when).
 
Analysis of harmonics:
The analysis of the harmonics of the measured currents can be selected via a menu item in CMS460-D. There the THD factor and the current value of the harmonics (1…40 at 50/60 Hz, 1…5 at 400 Hz) is displayed numerically and graphically.
 

Wiring diagram:

BENDER over/under current AC relay CMS460 wiring diagram

Dimensions:

BENDER over/under current AC relay CMS460 dimensions

Technical data:

BENDER over/under current AC relay CMS460 technical data

 

Ordering information:

BENDER over/under current AC relay CMS460 ordering information