Veris Industries H308 Install - Manual (Page 2)

Z204964-0C PAGE 2 ©2012 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 02121
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TM
INSTALLATION GUIDE
H308
OPERATION
The H308 is a current-sensitive switching device that monitors current (amperage) in
the conductor passing through it. A change in the conductor’s amperage that crosses
the adjustable switch threshold plus the hysteresis value causes the resistance of the
FET status output to change state, similar to the action of a mechanical switch. The
status output is suitable for connection to building controllers or other appropriate
data acquisition equipment operating at up to 30 volts. The H308 requires no external
power supply to generate its output.
TROUBLESHOOTING
Problem Solution
No Reading at
Controller
• Check for control voltage at sensor (<30V)
• Check for amperage in monitored conductor (> 0.75A)
• Assure that sensor core mating surfaces are clean and that the core clamp
is completely closed
• Verify that the setpoint is not above operating amps by turning screw
CCW (up to 20 turns) until the contacts close (Status Closed LED turns on).
Setpoint screw
has no stops
The 20 turn setpoint screw has a slip clutch to prevent damage at either
end. To re-start the calibration process, turn the screw 20 full turns CCW.
This sets the device in its original and most sensitive position. Resume
calibration from the beginning.
Both LEDs
are lit
The screw has been turned too far CW. Turn the screw 20 full turns CCW
and resume calibration from the beginning.
For load currents less than sensor minimum rating:
Wrap the monitored conductor through the center window and around the sensor
body to produce multiple turns. This increases the current measured by the
transducer.
4x
0.1A
DANGER: 5A CTs can present hazardous voltages.
Install CTs in accordance with manufacturer's instructions.
Terminate the CT secondary before applying current.
H68xx‑5A CT
240A
300A: 5A
> 50 A (Sensor max.)
CAUTION
RISK OF EQUIPMENT DAMAGE
• Derate the product’s maximum current for the number of turns
through the sensing window using the following formula.
Rated Max. Amps ÷ Number of Turns = Max. monitored Amps
e.g. : 100A ÷ 4 Turns = 25 Amps max. in monitored conductor
• Failure to follow these instructions can result in overheating
and permanent equipment damage.
CALIBRATION
A. To monitor under-current (belt loss, coupling shear, status)
A
OK!
!
1. Turn setpoint screw
clockwise until Status OPEN
LED turns ON.
2. Slowly turn the screw counter-clockwise until the Status CLOSED LED just
turns ON.
3.Turn the screw an
additional 1/4 turn
counter-clockwise for
operational margin.
B. To monitor over-current (mechanical problems, seized impeller)
A
OK!
!
3. Turn the setpoint
screw an additional
1/4 turn clockwise for
operational margin.
1.Turn setpoint screw
counter-clockwise until Status
CLOSED LED turns ON.
2. Slowly turn the setpoint screw clockwise until the Status OPEN LED just turns ON.
OK!
STATUS
OK!
STATUS
Setpoint
Status
Open
STOP
Setpoint
Status
Closed
STOP
1/4
Setpoint
+
Setpoint
Status
Closed
STOP
Setpoint
Status
Open
STOP
+
1/4
Setpoint
Before beginning calibration, establish normal load conditions.
OK!
A
OK!
Then choose either A or B below.
< 0.75 A (Sensor Min.)
NOTES
For load currents greater than sensor maximum rating:
Use a 5 Amp (H68xx series) Current Transformer (CT) as shown. This technique can be
combined with wrapping (see below) to add range for a low current load on a high
current source.