VSD Control Circuit
Please see below images and table regarding the VSD Control Circuit and take note of the following:
- EMHEATER VSDs are NPN Mode (PNP and NPN sensors are both supplied with positive and negative power leads and produce a signal to indicate an “on” state. PNP sensors produce a positive output to industrial controls input, while NPN sensors produce a negative signal during an “on” state).
- EMHEATER VSD Control Circuits by default have a bridge between the PLC and +24V Terminals to power all the Digital Input Terminals (if not connected the DI terminals will not work). When using an external power supply to provide power, remove the bridge between the PLC and +24V terminals and connect the External Power Supply input to the PLC terminal (note that EMHEATER VSDs of 2.2kW and smaller do not have a PLC terminal and thus do not allow an external power source to be used).
- EMHEATER VSDs larger than 2.2kW have 2 x GND terminals, both serving the same purpose.
- EMHEATER VSDs of 2.2kW and smaller only has one set of Relay’s (TA-TB-TC and not both TA1-TB1-TC1 and TA2-TB2-TC2). For these smaller VSDs the single relay is programmed using the same parameters as used for Relay 2 (TA2-TB2-TC2).
Please Note: For Smaller Drives with only one set of Relays (TA-TB-TC), use the TA2-TB2-TC2 Relay parameter settings.
