SMA PPM-10 - Connecting the Contactor and Signal Generator

6 Electrical Connection
SMA Solar Technology AG
Installation Manual 33PPM-10-IA-en-16
6.3 Connecting the Contactor and Signal Generator
NOTICE
Damage to signal generators due to voltage at the switching input
The switching inputs are intended for the connection of potential-free signal generators such as switches and ripple
control receivers suitable for 24VDC. Unsuitable signal generators may be overloaded when a voltage of
24VDC is applied to the signal input. The signal generators may be damaged due to overload.
• Ensure that the signal generator is suitable for voltages of 24VDC.
• Ensure that the signal generator is potential-free.
Reserving the digital inputs and outputs when using a Redundancy Connector
When a Redundancy Connector is used, the digital inputs and outputs on the PowerPlantManager are reserved
for connecting to the Redundancy Connector. In this case, contactors and signal generators must not be
connected to the PowerPlantManager.
• When a Redundancy Connector is used, connect contactors and signal generators to the Redundancy
Connector (see operating manual of the Redundancy Connector).
The switching inputs and outputs for contactors and signal generators can be configured via the user interface. Each
access must be assigned either a switching input or a switching output function:
• The switching outputs function as coupling relays with potential-free contacts.
• Switching inputs supply 24VDC. This means that you can connect potential-free signal generators (e.g. circuit
breaker or ripple control receiver) to the switching inputs without an additional voltage source.
Example of connecting a contact and a signal generator:
24 V
24 V
Control
Contactor
Control
Figure 18: Example of connecting a contact (on the left) and a signal generator (on the right)
Requirements for connecting a contactor:
• The contactor must be suitable for connection to multifunctional switching outputs (see Section10, page63).
• Maximum switching voltage: 30VDC
• Limiting continuous current: 4ADC
• Maximum switching current: 4ADC
• Minimum load recommended: 10VDC / 10mA; 24VDC / 1mA
Requirements for connecting a signal generator:
☐ The external feedback contact must be able to switch a switching current less than 10mA at 24V.
☐ The signal generator for the fast stop (Fast Stop) can be designed as a break contact or make contact.