The CAP Series current sensing relay is used to detect an AC or DC overcurrent condition. It has two operating modes: non-latching or latching. Each relay has three top-mounted potentiometers: one for selecting the pick-up setting within the selected monitored current range (“Threshold”), one for selecting the drop-out setting of 5-50% below pick-up setting (“Hysteresis”), and one for setting the startup sensing delay (ts). This delay, which is adjustable from 0.1 – 10 seconds, inhibits energization of the output relay during the start-up period.

CAP Series relays have three built-in current ranges (see right) to monitor both AC & DC current. Each one is easily selectable by connecting to the corresponding terminal and to the COM terminal (see Wiring Diagram below).

Non-Latching Mode:
The unit will operate in the nonlatching mode if no circuit is completed across pins 9 & 11. After input voltage is applied (LED is Green) and the start-up sensing delay (ts) of 0.1 – 10 seconds is completed, the relay will energize when the monitored current is above the adjustable pick-up setting (“Threshold”). The LED will be Red. It will de-energize when the monitored current goes below the adjustable drop-out setting (“Hysteresis”) by 5-50% of the selected pick-up setting or when input voltage is removed. The LED will be Green

Latching Mode:
The unit will operate in the latching mode if a N.C. contact (Memory S2) is connected across pins 9 & 11 (see Wiring Diagram). After input voltage is applied (LED is Green) and the start-up sensing delay (ts) of 0.1 – 10 seconds is completed, the relay will energize when the monitored current is above the adjustable pick-up setting (“Threshold”). The LED will be Red. It will de-energize when the monitored current goes below the adjustable drop-out setting (“Hysteresis”) by 5-50% of the selected pick-up setting and the N.C. contact (Memory S2) is opened, or when input voltage is removed. The LED will be Green. It is recommended to set the Hysteresis at 5% when in the latching mode.

 

Features

• Equivalent to LIRT and DIRT products from Crouzet
• Monitors for overcurrent conditions
• Each unit can monitor three current ranges for both AC & DC
• External CT can be used to extend ranges
• Adjustable Pick-up & Drop-out Setting
• Adjustable Sensing Delay on Power-up
• Non-Latching & Latching modes
• LED indicates relay status
• 11 Pin Plug-in socket can be DIN rail-mounted or panel-mounted
• aaaaa
• 10A SPDT output contacts

 

Downloads

Document	File Type	File Size	Download
CAP Series Datasheet	PDF	359 KB