Manual

Chapter 5 Configuring the EM920
General Meter Setup
EM920 Power Quality and Revenue Meter 75
NOTE
Test Mode options and other device options have different
security levels. You may not be allowed to change the device
options if the user password you provided does not have
required permissions.
The following table lists available device options.
Display
Label
Parameter Options Default Description
Power/Energy Options
Power Mode Power Calculation
Mode
S=f(P, Q) (reactive
power mode),
Q=f(S, P) (non-
active power
mode)
S=f(P, Q) The method used for calculating
reactive and apparent powers (see
“Power Calculation Modes” below)
Energy Roll Energy Roll Value,
kWh
1000.0
10000.0
100000.0
1000000.0
10000000.0
100000000.0
100000000.0 The value at which energy
counters roll over to zero
End of Bill End of Billing
Period
Auto (monthly)
Auto/COM
Auto/COM/Manual
COM
Manual
Auto
(monthly)
Triggering an end of billing period:
Auto – monthly self-reading
COM – remote via communications
Manual – from the front display
Tariff Control Tariff Control Calendar
Communication
Tariff inputs
D1…D10
1 Defines the tariff switching method
(see “Tariff Control” below).
Num Tariffs Number of tariffs 1-8 1 Defines the number of season tariff
rates when no TOU calendar
schedule is available
Transf.
Correction
OFF (disabled)
ON (enabled)
OFF Enables instrument transformer
correction – only via the front
display
Loss
Compensation
OFF (disabled)
ON (enabled)
OFF Enables transformer/line loss
compensation – only via the front
display
Demand Forgiveness (Cold Load Pickup)
Dmd. Delay Demand Delay,
min
0-60 min
0=disabled
0 The forgiveness time after an
outage that the meter will not
calculate or log the maximum
demands
Min. Outage
Duration
Minimum Outage
Duration, s
0-900 s 0 The minimum power outage
duration to apply the demand
forgiveness time
Test Mode
Test Mode Energy LED Test OFF (disabled)
ON (enabled)
Disabled Setting this option puts the meter
into TEST mode
Pulse
Constant
Energy LED pulse
rate, Wh/impulse
0.01-0.25 Wh/imp
(100,000 – 4,000
imp/kWh)
0.10 Wh/imp
(10,000
imp/kWh)
Test LED pulse constant - the
amount of accumulated energy (in
secondary units) giving one pulse
via “WATT” and “VAR” LEDs
Data Scales
N/A Volts Scale, V 60-600 V 144 V The maximum voltage scale
allowed, in secondary volts. See
Data Scales
in Appendix G
N/A Amps Scale, A 1.0 – 50.0 4A/20 A The maximum current scale
allowed, in secondary amps. See
Data Scales
in Appendix G