onset
®
POWER MONITORING
INSTALLATION GUIDE
14724-D
PAGE 3
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Onset, HOBO, HOBOware, and HOBOlink are trademarks or registered trademarks of Onset Computer Corporation.
INSTALLATION
Disconnect power prior to installation.
Any covers that may be displaced during the
installation must be reinstalled before powering
the unit.
Mount the meter in an appropriate electrical enclosure near
equipment to be monitored.
Do not install on the load side of a Variable Frequency Drive
(VFD).
The meter can be mounted in two ways: on standard 35 mm DIN rail
or screw-mounted to the back of the enclosure.
A. DIN Rail Mounting
1. Attach mounting clips to the underside of the housing by sliding
them into the slots from the inside. The stopping pegs must
face the housing, and the outside edge of the clip must be flush
with the outside edge of the housing.
2. Snap the clips onto the DIN rail. See diagram of the underside
of the meter.
3. To prevent horizontal shifting across the DIN rail, use two end
stop clips.
B. Screw Mounting
1. Attach the mounting clips to the underside of the housing by
sliding them into the slots from the outside. The stopping pegs
must face the housing, and the screw hole must be exposed on
the outside of the housing.
2. Use three #8 screws (not supplied) to mount the meter to the
back of the enclosure. See diagram of the underside of the
meter.
SUPPORTED SYSTEM TYPES
The E50B2 meter has a number of different possible system wiring configurations (see Wiring Diagrams, page 5–6). To configure the meter, set the
System Type via the User Interface. The System Type tells the meter which of its current and voltage inputs are valid, which are to be ignored, and
if neutral is connected. Setting the correct System Type prevents unwanted energy accumulation on unused inputs, selects the formula to calculate
the Theoretical Maximum System Power, and determines which phase loss algorithm is to be used. The phase loss algorithm is configured as a
percent of the Line-to-Line System Voltage (except when in System Type 1L + 1n) and also calculates the expected Line to Neutral voltages for
system types that have Neutral (System Types 2L + 1N and 3L + 1n).
Values that are not valid in a particular System Type will display as “----” on the User Interface
CTs
Voltage
Connections
System Type
Phase Loss Measurements
Wiring
Diagram
No. of
wires
Qty ID
Qty ID
Type
User
Interface:
SETUP>S SYS
VLL
VLN
Balance
Diagram
Number
2
1
A
2
A, N
L-N
1L + 1n
AN
1
2 1
A 2
A,
B L-L 2L
AB
2
3
2
A,B
3
A, B, N
L-L with N
2L + 1n
AB
AN, BN
AN, BN
3
3
3
A, B,C
3
A, B, C
Delta
3L
AB, BC, CA
AB, BC, CA
4
4
3
A, B, C
4
A, B, C, N
Grounded
Wye
3L + 1n
AB, BC, CA
AN, BN, CN
AN, BN, CN &
AB, BC, CA
5, 6
