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ALARM RELAY K1
The relay K1 is activated if a fault is detected in the system. The effective direction, whether it
should close or open in case of fault, may be set using the parameter K1 closed-circuit OFF, ON by
using LBA or Thyro-Tool Familiy. Which indications lead to switching of the relay may also be set.
Recommendation: keep the default setting.
LIMITING RELAY K2
The relay K2 only closes (in default setting) if at least one of the following values is exceeded:
• 1. max. admissible effective value of the load current
• 2. max. admissible effective value of the load voltage
• 3. max. admissible active power of the load
The relay releases if none of the values is exceeded anymore. It is possible to set which indications
lead to switching of the relay. Recommendation: keep the default setting.
OPTIONAL RELAY K3
If changes are made to the default relay settings due to the application, then preferrably the relay
K3 should be reparameterized.
It is possible to realize functions like for instance a follow-up relay for ventilator control or by pass
the alarm relay at startup of the system. It may also be used as a further alarm relay or limiting relay,
by reparameterization.
The illustration shows the relay K3 for bridging the startup alarm.
2.5 MONITORING
Faults occurring in the Power Controller or in the load circuit are signalled. Signalling is performed
via LED (FAULT) and via relay with potential-free change-over contact. The fault buffer may be
read via LBA or the interface after selecting the status line. Simultaneously with the fault signal,
the pulse shutdown may optionally also be set (Imp.-Absch. OFF, ON). Faults having occurred are
shown in the display of LBA by text status indications in the status line. After selecting the status
line, the indication may be called up.
FIG. 3 SWITCH-ON FAULT BRIDGING