hager hw+ - Page 77

776LE008146B
Advanced protection functions
5.8 Voltage unbalance protection (UNBV-47)
nba47: activation threshold of
the voltage unbalance
protection
t47: activation time delay of the
voltage unbalance protection
t47
U
t
nba47
Adjustment parameters
UNBV-47
ANSI 47
Config. Configuration of the protection
Inhibit
Inhibition of the protection
Threshold Activation threshold
Time Activation time delay
Configuration
The configuration defines the protection behaviour when the activation threshold and the time
delay are reached.
Trip Circuit breaker tripping
Alarm Alarm without tripping the circuit breaker
O Protection deactivated (default setting)
Inhibition
This parameter allows the protection action to be inhibited temporarily based on a command
sent in one of the following ways:
- sentinel Energy display from the MODE menu
- Hager Power setup software (Commands menu)
- Digital input (DI): assignment of the digital input to the inhibition required
- Modbus communication.
On The protection is inhibited while the inhibition command is at On
O The protection is fully operational while the inhibition command is at O
Activation threshold
The activation threshold is expressed as a percentage.
Adjustment range: 2 to 90% in increments of 1.
Precision of the activation threshold: +/- 2 units, for example for a 20% threshold the
accuracy will be between 18% and 22%.
Activation time delay
Adjustment range: 0.5 to 60.0 s with steps of 0.1.
Accuracy of the activation time: +/- 40 ms from 0.1 to 2 s +/-2 % above 2 s.
Hysteresis: 98%.
Minimum tripping time: 60 ms.
Maximum tripping time: 140 ms with time delay set to 0.5 s.