Grundfos E-pumps

10
Grundfos E-pumps
Advanced use of MLE motors
Signal relays
Signal relays are used to give an output indication of
the current operational status of the MLE. The signal
relay is a potential free contact (also called a dry
contact). The output signals are typically transmitted to
external control systems.
Purpose and benefits
The signal relays offer these features:
• The signal relays can be remotely (via bus) or
internally controlled.
• The signal relays can be set up to indicate several
types of operational status.
• A relay delay can be defined to avoid activating the
relay in case of periodic failures.
Description
The signal relays can be set up with these three
parameters:
• relay control
• relay setup
• relay delay.
Fig. 80 Signal relay parameters for 0.5 - 10 Hp pumps
Applications
Signal relays can be used in all applications involving a
need to read out the operational status to e.g. a control
room or to a superior control system.
Grundfos E-pumps have one or two signal relays,
depending on the size of the pump.
2-pole
[Hp]
Single-phase pumps
4-pole
[Hp]
0.50 - 1.5 0.33 - 1.0
●
●
1 relay 1 relay
Three-phase pumps
2-pole
[Hp]
1.0 - 10 15 - 30
●
●
1 relay 2 relays
Fig. 81 Signal relay parameters for 15 - 30 Hp pumps
Relay control
See information in section 3. E-pumps on page 32 for
basic signal relay activation. The relay time is
0 seconds and the signal relay in internally controlled.
The advanced relay control can only be set via the
PC Tool E-products.
Relay control has these two setting options:
• Internally controlled
The relay is internally controlled by the variable
frequency drive software according to the setup of
the relay [Ready, Fault, Operation].
• Remotely controlled
The relay is controlled via commands from the
GENIbus.
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