26
Reverse feed
6 Installation
Instruction book, IQAN-MC3
Connecting of Supply Voltage
The supply voltage, should be within the operating interval, see Appendix A, on page
46. Connect the supply voltage to +BAT positions C1:13, C1:14 and -BAT positions
C1:1,C1:2. Protect the module by using a fuse. Requisite fuse level should be max. 20
A, fast (F).
Connecting the emergency stop and voltage supply.
NOTICE
Do not use the chassis as the negative terminal.
Reverse feed
WARNING
Risk of inadvertently supplying power to the module!
If any of the outputs are shorted to battery voltage, the module will be powered by
reverse feed of voltage, even when the connection to module power is off.
The IQAN-MC3 is capable of detecting if outputs are shorted to battery voltage at start-
up, and will prevent the application from starting.
If the same short circuit occurs while the module is already powered, it may also be
detected by the module, but shutdown will be limited to the specific output. see
Appendix B, on page 51 for details.
It is highly recommended that this failure mode is considered when designing the
electrical system, so that the risk of inhibiting the emergency stop shutdown is
minimized.
IQAN-MC3 addressing/terminating
Use of an ID-Tag
Each IQAN-MC3 module must be configured by using an ID-tag. The value of the ID-
tag will give the MC3 an address to differentiate it from other MC3 units on the same
bus. The desired functionality is built into the application file using IQANdesign
software. For more information please refer to the IQANdesign user manual.
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