Basler Electric BE1-47N - Manual (Page 38)

5-2 BE1-47N Testing 9170400990 Rev J
If VBC = 0 Vac (Short phase B to Phase C)
Then V
AB
= V
AC
= –V
CA
OR V
CA
= –V
AB
∠0° = V
AB
∠180°
Substituting into Equation 5-2:
( )
( ) [ ]
( ) ( ) [ ]
( ) ( ) [ ]
( ) [ ]
30
3
30 3
3
1
300 1 0 1
3
1
180 1 120 1 0 1
3
1
180 0
3
1
2 2
− ∠ =
− ∠ =
∠ + ∠ =
∠ × ∠ + ∠ =
∠ ∝ + ∝ + =
AB
AB
AB
AB
AB AB LL
V
V
V
V
V V
V

 
  

3
30
2
2
N
AB
N
LL
PU
V
V
V
V
V
 − ∠
= =
Equation 5-3
Solving for V
AB
:
Magnitude
N PU
V AB
V V
× ×
=
3 2
Where V
N
= 120 V for sensing input range 3 or 208 V for sensing input range 5
Example:
20% V
2
= 0.2 per unit V
2
= 0.2 per unit V
2
(with phase B shorted to phase C)
For 120 V nominal, V
N
= 120
( )
( )
( )
120 3 2 . 0 =
AB
V
V
AB
= 41.569 Vac when phase input B is shorted to C
6. Test the other phases by repeating the previous steps while shorting different phase pairs.
Overvoltage Pickup and Dropout
1. Adjust the Overvoltage Pickup switch to the E (10%) position.
2. Apply 1.10 times the nominal input voltage (110%) across case terminals 7 (B-phase) and 8 (C-
phase). The Overvoltage Pickup LED should light.
3. Vary the input voltage to confirm the pickup value.
4. Lower the input voltage until the Overvoltage Pickup LED turns off. Record the input value. Dropout
should be within 2.0% of the pickup value (i.e., input voltage at time of pickup, LED on).
Undervoltage Pickup and Dropout
1. Adjust the Undervoltage Pickup switch to the E (10%) position.
2. Apply 0.90 times the nominal input voltage (90%) across case terminals 7 (B-phase) and 8 (C-phase).
The Undervoltage Pickup LED should light.
3. Vary the input voltage to confirm the pickup value.