Z206073-0C
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©2013 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected]
01131
TM
INSTALLATION GUIDE
H11D
Alta Labs, Enercept, Enspector, Hawkeye, Trustat,Aerospond, Veris, and the Veris ‘V’ logo are trademarks or registered trademarks of Veris Industries, L.L.C. in the USA and/or other countries.
MEMORY RESET
During setup, the H11D automatically determines the alarm limits according to the
switch settings and stores them in nonvolatile memory. The H11D requires a memory
reset to clear the nonvolatile memory if any significant system changes occur, such as:
• The sensor is reinstalled on a different motor.
• The motor is re-sheaved.
• The system is air balanced or air duct restrictions change.
• The motor load changes significantly.
To reset the H11D:
1. Establish normal operating conditions for the monitored conductor (e.g. clean air
filters, close duct access doors).
2. The reset button has two positions, in and out. Push the button until there is a
noticeable click to change the position of this switch. This causes a change of
state, which triggers the reset function. The nonvolatile memory is erased and the
H11D enters the learning mode.
Note: The reset function can be performed even if the H11D is not installed
on a conductor. Pushing the button (changing the state) will clear the
nonvolatile memory at the next power-up.
Note: In normal operation, this button can be in either the in or out position.
FUNCTIONAL ILLUSTRATION
ALARM RESET
5% Typical
POWER
ON
POWER LOSS
ØAAC
ØAAC
LEARN
(MODE)
30 SEC
ALARM
(MODE)
ALARM
(MODE)
NORMAL
(CURRENT
MONITOR
MODE)
NORMAL
(CURRENT
MONITOR MODE)
NOMINAL
LEARNED
CURRENT
1 SEC. DELAY 30 SEC. DELAY
Amperage Over-Limit Mode
Regardless of the trip point slide switch position and for any learned nominal current,
if the amperage in the conductor exceeds 200 A, the H11D enters the over-limit mode.
In this mode, the LCD value for NOW always reads OL (over limit). The H11D returns to
normal operation mode when the amperage drops below 200 A. The status output
contacts do not change state when the H11D enters over-limit mode.
NOTES
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.
Program the controller to account for the extra
turns, e.g., if four turns pass through the sensor
(as shown), divide the normal controller reading
by 4.
The LCD displays the sum current of all the
conductors passing through the center window.
The trip points and on/off status are established
by the total current passing through the center window during the learning mode.
Example: A conductor with a load of 2 A is wrapped through the center window
3 times, with the trip point slide switch in the A (40%) position. The total current
detected by the H11D is, therefore, 6 A (2A x 3). This is the value displayed in the LCD.
During calibration, the H11D learns the nominal amperage and calculates 40% of that
value: 6 A x 40%, or 2.4 A. The trip limit currents are then set at 6A ±2.4, or 8.4 A and
3.6 A.
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
4A
> 200 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.
4x
1A
< 2.5 A
(Sensor Min.)
TROUBLESHOOTING
Problem
Solution
No Reading at Controller
• Check sensor calibration (see Calibration section)
• Check for amperage in monitored conductor (> 2.5 A)
• Verify that sensor core mating surfaces are clean and
that the core clamp is completely closed
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 above) to add range for a low current load on a high
current source.
