NOVUS SSR 4840AC Solid-State Relay Instruction Manual
- June 9, 2024
- Novus
Table of Contents
NOVUS SSR 4840AC Solid-State Relay
FEATURES
Solid-State Relays (SSR) are electronic devices used to switch resistive and inductive AC loads with many advantages over conventional relays. A command signal (INPUT) determines the activation of the load connected to the output terminals (OUTPUT)without electrical noise, sparking or mechanical wear. The device has an internal thyristor protection circuit (Snubber) and a Zero Crossing system, which allows switching on at zero Volt and off at zero Ampere. It also has optical isolation between INPUT and OUTPUT and a LED to indicate the on and off status.
OPERATION
Upon receiving a command signal at its input terminals, the SSR conducts (turns on) and powers the load. When the mains voltage crosses zero, conduction takes place. The same process happens during shutdown. The command signal is removed, but the SSR only blocks (turns off) at the next zero crossing.
This implies delays of no more than 8.3 milliseconds between the instant the ON/OFF command is triggered and the act of energizing or not energizing the load. Switching the load power on and off at a zero crossing has important advantages for the installation. No electrical interference is generated in the installation and the SSR is not subjected to severe switching conditions. This device CANNOT be used to command electrical charges in installations with DC voltage.
ELECTRICAL CONNECTIONS
2 connections are required: Command signal and connection with the load. When
making the connection to the load, you must use an ultra-fast fuse to protect
the installation. Well-fixed terminals and adequate wiring help improve the
installation efficiency.
HEAT DISSIPATION
SSR generates heat during its conduction. This heat must be dissipated to
avoid SSR fail due to over-heat. The load current (IL) ratings set for each
SSR model consider the use of a suitable heat sink. Without a heat sink, the
maximum allowed load current is substantially reduced. You can calculate the
appropriate heat sink for your process or use the model indicated by NOVUS
.
t these current levels, in addition to the heat sink, forced ventilation is also critical for maximum performance. Thermal paste, which is essential for perfect heat transfer, must be used between the SSR and the heat sink. The set SSR + heat sink should be fixed in a vertical position to facilitate heat exchange.
Notes:
- The use of the Thermal Pad that comes with the SSR is optional. It is recommended for installations where the surface of the heatsink to receive the SSR is not perfectly flat or regular.
- Make sure that the screws on the SSR terminals are properly tightened. Contact problems at these points influence the proper operation of the entire installation power system.
- Prior validation tests are important to identify failures in the installation, especially overheating points.
The graphs below show the current carrying capacity of the SSR as a function
of ambient temperature when mounted on the indicated heatsink and whether or
not the fan is used.
SPECIFICATIONS
Parameter
| ****
Unit
| Model
---|---|---
SSR 4840AC
| SSR 4880AC
Load current (I L)| A| 40| 80
Load voltage| Vcc| 40 to 530| 40 to 530
Voltage drop (V ssr)| V| 1.1 to 1.5| 1.1 to 1.5
Leakage current| mA| < 8| < 8
Frequency| Hz| 47 to 63| 47 to 63
dv/dt| V/µs| 500| 500
I²t (50/60 Hz)| A²s| 1770 / 1629| 3230 / 2971
Control voltage| Vcc| 90 to 280| 90 to 280
Control current| mA| 5 to 10| 7 to 12
Switching time| ms| < 10| < 10
Control method| | Zero crossing| Zero crossing
Isolation| V rms| 4000| 4000
Housing temperature| °C| -40 to 80| -40 to 80
Plastic body material| UL E211125 / 94 V-0
Metal base material| Aluminium with phosphor bronze coating
Certifications| CE, UKCA
DIMENSIONS
WARRANTY
Warranty conditions are available on our website www.novusautomation.com/warranty.