56 Specifications
X Terminal Options
These options all utilize the
X
(auxiliary) terminal on the
MODBUS
connector:
Option X5
:
Provides 5 Vdc at up to 60 milliamps between the
C
(common) and
X
(5 V) terminals.
Output Voltage:
5 Vdc ± 5%
Minimum Output Current:
0 mA
Maximum Output Current:
60 mA
Maximum Short-Circuit Output Current:
150 mA
Recommended Maximum 5 V Wire Length:
30 cm (1 foot)
Option IO
:
Provides a digital input (level sensing and pulse counting) or output (for load shedding
and other applications) on the
X
terminal.
Option SSR
:
Provides a solid-state relay (contact closure) output between the
X
and
C
terminals
for load shedding and other applications.
Special Options
Contact the factory about the following special options:
Option 232
:
Provide RS-232 I/O in place of RS-485.
Option TTL
:
Provide 5 V TTL UART I/O in place of RS-485.
Accuracy
The following accuracy specifications do not include errors caused by the current transformer
accuracy or phase angle errors. “Rated current” is the current that generates a CT output voltage
of 0.33333 Vac.
Condition 1 ‑ Normal Operation
Line voltage:
-20% to +15% of nominal
Power factor:
1.0
Frequency:
48 - 62 Hz
Ambient Temperature:
25°C
CT Current:
5% - 100% of rated current
Accuracy:
±0.5% of reading
Condition 2 ‑ Low CT Current
All conditions the same as Condition 1 except:
CT Current:
1% - 5% of rated current
Accuracy:
±1.0% of reading
Condition 3 – Very Low CT Current
All conditions the same as Condition 1 except:
CT Current:
0.2% - 1% of rated current
Accuracy:
±3.0% of reading
Condition 4 ‑ High CT Current
All conditions the same as Condition 1 except:
CT Current:
100% - 120% of rated current
Accuracy:
±1.0% of reading
Condition 5 ‑ Low Power Factor
All conditions the same as Condition 1 except:
Power factor:
0.5 (±60 degree phase shift between current and voltage)
