5 PT 100 sensors on motor relays
5 PT 100 sensors on motor relays
(OP)
Hi.
Can anyone give me the cheapest solution for a digital motor protection relay, with connection possibility for 5 PT 100 sensors ?
I have checked some relays like MM200, MM300 from Multilin, General Electric , but only 1 thermistor imput available.
Motors are 400V AC.
Can anyone give me the cheapest solution for a digital motor protection relay, with connection possibility for 5 PT 100 sensors ?
I have checked some relays like MM200, MM300 from Multilin, General Electric , but only 1 thermistor imput available.
Motors are 400V AC.





RE: 5 PT 100 sensors on motor relays
RE: 5 PT 100 sensors on motor relays
For low cost low voltage applications, the Siemens Simocode Motor Management Relay can have an expansion module attached that will accept 3 PT100 RTDs and the base unit will accept 1 additional thermistor, but to do 5 RTDs, you will need a bigger relay.
If all you want are the RTD inputs and you have another SSOL that you can use, there is a straight RTD relay that can accept up to 8 inputs, such as the Springer T-538 relay. I have used them in the past, they work great as long as you don't want high speed sensing. They use a mux to cycle through the probe inputs (and in fact, you also have to be willing to put up with the clicking sound of the mux) and it takes a few seconds for it to cycle though, even if you don't have probes hooked up to all of the inputs.
ht
If you have something in the control system with Modbus master capability, you can also use the Startco SIO-RTD module.
http://www.startco.ca/products/sio-rtd/
RE: 5 PT 100 sensors on motor relays
ht
Best Regards.
Slava
RE: 5 PT 100 sensors on motor relays
http
motor relay with 6 RTD module
RE: 5 PT 100 sensors on motor relays
I don't know where you are in the world but Startco (www.startco.ca) has a MPU-32 motor protection relay that you can add a RTD module to. I think it's a fairly cheap solution.
www.selinc.com has a motor relay and RTD module that runs about $1200 + $800.
RE: 5 PT 100 sensors on motor relays
RE: 5 PT 100 sensors on motor relays
You could possibly buy a whole soft-starter with built-in motor protection (including 8 100ohm RTD) for that $5k (or not too much more) depending on the size of the motor.
RE: 5 PT 100 sensors on motor relays