novus SSR Solid State Relay Instruction Manual
- June 4, 2024
- Novus
Table of Contents
Solid State Relay – SSR
TRIPHASIC 40 AND 90 A
– INSTRUCTIONS MANUAL – V1.0x D
FEATURES
The Solid State Relays (SSR) are electronic devices used for switching
resistive or inductive AC loads with many advantages over conventional relays.
Increased lifetime, due to the fact that there are no moving parts, and thus,
no mechanical wear. Zero cross switching, which implies lower electrical
noise. Silent operation. Control INPUT signal optically isolated from the
OUTPUT. Internal snubber provided.
OPERATION
A control voltage applied to the device input turns the SSR on, energizing the
load. The conduction effectively occurs at the next zero crossing of the mains
voltage. When the input signal is removed, the SSR turns off when the load
reaches a current equal to zero. This means that the load switching may be
delayed by ½ of the mains period (or 8.3 ms for the 60 hz mains).
Turning the output ON and OFF only on the mains voltage zero crossing brings
important performance advantages to the system: practically no EMI is
generated during the load switching and the SSR is submitted to less severe
switching conditions. On the other hand, the SSR is suitable for AC loads only
(it cannot be used to switch DC loads).
The SSR control signal is indicated by a LED on the SSR body.
ELECTRICAL CONNECTIONS
The two connections needed for the installation of the SSR are the command
signal and the load circuit. The load circuit must be protected by an ultra-
fast fuse with a rate that matches the SSR nominal current specification. The
SSR terminals must be firmly screwed and the wire gauge compatible with the
output load.
HEAT DISSIPATION
The SSR generates heat during its conduction. This heat must be dissipated to
avoid SSR failure due to over-heat. The nominal SSR load specification assumes
the use of a suitable heat sink. Without a heat sink, the allowed load current
is substantially reduced. The user may calculate the needed heat sink or make
use of a heat sink suggested by NOVUS.
For better
heat transfer, a thermal conducting paste must be used between the SSR and the
heat sink. The SSR along with its heat sink must be mounted in a vertical
position such as to allow for airflow and thus a good heat exchange.
Notes:
- The use of the Thermal Pad that comes with the SSR is optional. In installations where a heat sink is provided for the cooling function, you do not need to use the Thermal Pad. In installations where the surface that will receive the SSR is not perfectly flat, its use may improve the cooling of the SSR.
- 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.
- Before continuous use, always perform installation validation tests.
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.
The
indicated Novus heatsink models are:
-
SSR3-4840: NDP3-120 mm / (P/N 8825000100)
Rthha= 0.52 °C/W
Rthha= 0.175 °C/W (with fan 6 m/s) -
SSR3-4890: NDP3-220 mm / (P/N 8825000220)
Rthha= 0.35 °C/W
Rthha= 0.125 °C/W (with fan 6 m/s)
The respective specifications of use are:
SPECIFICATIONS
**Parameter| ****Unit**|
Model
---|---|---
**SSR3-4840| ****SSR3-4890
Load current (IL)| A rms| 40| 90
Load voltage| V rms| 40 to 530| 40 to 530
Turn-on voltage (Vssr)| V rms| < 1.5| < 1.5
Leakage current| mA rms| < 1| < 1
Frequency| Hz| 47 to 63| 47 to 63
Dv/dt| V/µs| 300| 300
Control voltage| Vcc| 4 to 32| 4 to 32
Control current| mAcc| 15 to 20| 15 to 20
Switching time| ms| < 10| < 10
Control method| | Zero cross trigger| Zero cross trigger
Isolation| V rms| > 2000| > 2000
Operating temperature| °C| -40 to 80| -40 to 80
Weight| g| 397| 431
Status Indicator**| | LED| LED
Table 1 – Specifications
DIMENSIONS
WARRANTY
The warranty conditions are set forth on our website
www.novusautomation.com/warranty.
NOVUS AUTOMATION
Documents / Resources
|
novus SSR Solid State
Relay
[pdf] Instruction Manual
SSR Solid State Relay, SSR, Solid State Relay, State Relay, Relay
---|---
|
NOVUS SSR Solid State
Relay
[pdf] Instruction Manual
SSR Solid State Relay, SSR, Solid State Relay