32 Specifications
●
Option PW: Pulse Width
- This specifies the pulse
ON
(closed or conducting) period in
milliseconds. For example,
Opt PW=100
configures 100 millisecond pulse
ON
periods. See
Manual Supplement MS-17: Option PW (Pulse Width)
for details.
●
Option Kh: Watt‑hour Constant
- This specifies the watt-hour constant, or the number of
watt-hours that must accumulate for each pulse generated by the meter. Each pulse includes
an
ON
(conducting) and
OFF
period. The number of watt-hours may be small, even less than
one, or large. For example,
Opt Kh=1000
specifies one pulse per 1000 watt-hours (one pulse
per kilowatt-hour). See
●
Option CT: Current Transformer Rated Amps
- This specifies the rated amps of the
attached current transformers. This is only used in conjunction with
Option Kh
. It may be
specified as
Opt CT=xxx
or
Opt CT=xxx/yyy/zzz
if there are CTs with different rated amps
on different phases. See
.
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:
23°C ±
5°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)
Additional Error:
±0.5% of reading
Condition 6 ‑ Temperature Variation
All conditions the same as Condition 1 except:
Ambient Temperature:
-30°C to +55°C
Additional Error:
±0.75% of reading
