Installation MSM20/22/24/40/42/46/50
Release
09
11/2016 7
Supply voltage
Enable the supply voltage for the device only when the following
requirements are fulfilled:
the housing is closed
the terminal blocks are wired correctly
the terminal blocks for the supply voltage are connected
Internal fuses are triggered only in the case of a detected error in the
device. In case of damage or malfunction of the device, turn off the
supply voltage and return the device to the plant for inspection.
ESD Guidelines
The modules are equipped with electrostatically sensitive components.
These can be destroyed, or their life cycles reduced, by the effects of an
electrical field or by a charge equalization if the connections are touched.
You will find information about electrostatically endangered assemblies in
DIN EN 61340-5-1 (2007-08) and DIN EN 61340-5-2 (2007-08).
Requirements for connecting the signal contact
The following requirements apply without restrictions:
The voltage connected complies with the requirements for a safety extra-low voltage
(SELV) as per IEC/EN 60950-1.
The connected voltage is limited by a current limitation device or a fuse.
Observe the electrical threshold values for the signal contact.
See “General technical data” on page 47.
Requirements for connecting the supply voltage
The following requirements apply without restrictions:
All of the following requirements are complied with:
The supply voltage corresponds to the voltage specified on the type plate of the device.
The power supply conforms to overvoltage category I or II.
The power supply has an easily accessible disconnecting device (e.g., a switch or a plug).
This disconnecting device is clearly identified. So in the case of an emergency, it is clear
which disconnecting device belongs to which power supply cable.
The wire diameter of the power supply cable is at least 1 mm² (North America: AWG16) on
the supply voltage input.
The following requirements apply alternatively:
Alternative 1 The power supply complies with the requirements for a limited power source
(LPS) as per EN 60950-1.
Alternative 2 Relevant for North America:
The power supply complies with the requirements as per Class 2
Alternative 3 All of the following requirements are complied with:
The power supply complies with the requirements for a safety extra-low
voltage (SELV) as per IEC/EN 60950-1.
A fuse suitable for DC voltage is located in the plus conductor of the power
supply.
The minus conductor is on ground potential. Otherwise, a fuse is also
located in the minus conductor.
Regarding the properties of this fuse:
See “Technical data” on page 47.