The USB connection is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals; however, the USB
ground connection is not galvanically isolated from ground. Use only an isolated laptop as PC connection to the USB connector on
the drive.
10.6.2 STO Terminal XD2.19 (Terminal XD2.19 is Fixed PNP Logic)
STO Terminal XD2.19
(1)(2)
Voltage level, logic 0 PNP
Voltage level, logic 1 PNP
Typical input current at 24 V
Typical input current at 20 V
1
For more information about Terminal XD2.19 (Terminal 37 on the drive module) and Safe Torque O, see the VLT
®
FC Series - Safe Torque O Oper-
ating Guide.
2
When using a contactor with a DC coil inside with STO, it is important to make a return way for the current from the coil when turning it o. This
can be done by using a freewheel diode (or, alternatively, a 30 V or 50 V MOV for quicker response time) across the coil. Typical contactors can be
bought with this diode.
All digital inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
10.6.3 Control Card, 24 V DC Output
The 24 V DC supply is galvanically isolated from the supply voltage (PELV), but has the same potential as the analog and digital
inputs and outputs.
10.6.4 Control Card, 10 V DC Output
The 10 V DC supply is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
10.6.5 Digital Outputs
Programmable digital/pulse outputs
Voltage level at digital/frequency output
Maximum output current (sink or source)
Maximum load at frequency output
Maximum capacitive load at frequency output
Minimum output frequency at frequency output
Maximum output frequency at frequency output
Accuracy of frequency output
Maximum error: 0.1% of full scale
Resolution of frequency outputs
1
Can also be programmed as input.
The digital output is galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
AQ357954340588en-000201 / 130R0881 | 149Danfoss A/S © 2020.09
Specications
VLT® Refrigeration Drive FC 103
Operating Guide