RP91, power monitoring relay

Product catalog summary

Overview: The C-mac® Power Guard RP91 is a power monitoring module designed for 1-phase and symmetrical 3-phase motors. It provides power metering using the formula (U x I x cos φ) and features adjustable time delays for start-up and reaction, enhancing its sensitivity and reliability in monitoring power consumption.

Specifications:

Supply Voltage: Options include 127 V + N, 3 x 230 V, 230 V + N, 3 x 400 V, 240 V + N, and 3 x 415 V, all with a tolerance of +/- 10%.
Supply Frequency: 40-70 Hz.
Power Consumption: 2.5 VA.
Operating Temperature: -20°C to +60°C.
Humidity: 0 - 90% RH, non-condensing.
Metering Ranges: Vary based on current range and supply voltage, with maximum loads specified for each configuration.
Relay Output: 1-pole, 8 A / 250 VAC.

Features:

Adjustable Start-up Delay: 0.1-30 seconds to ensure relay activation independent of load at motor start.
Adjustable Reaction Delay: 0.1-30 seconds to prevent relay release during short power consumption changes.
Setpoint Adjustment: Coarse adjustment via a 10-position switch and fine adjustment via a potentiometer for high sensitivity.
Hysteresis: 1.3% of the total metering range.
Latch Function: Maintains relay release state until connection is opened or supply voltage is disconnected.

Applications: The RP91 is suitable for monitoring and protecting motors and machinery, particularly in applications requiring quick reaction to overloads or alarms for underloads. It is recommended for use in scenarios where phase angle monitoring is critical, such as detecting belt breakages or pump dry runs.

Installation and Adjustment:

Connection Examples: Provided for both 1-phase and 3-phase setups, with or without current transformers.
Adjustment Procedures: Detailed steps for setting up both overload and underload functions, including coarse and fine adjustments.

Ordering Information: The RP91 is available in various configurations based on supply voltage, function (normal, inverted, autostart), and current range.

Materials and Construction: The housing is made of self-extinguishing NORYL-SE-1, with nickel-plated brass terminals, and weighs 110 g.