TROUBLESHOOTING
For correct operation , you should have the following
!
Either ‘Battery Charge’
or ‘Battery Float’
- if external power on
!
‘Power’
(Green)
!
‘Compression’
(Green) only
whilst audio signal is applied to an input
!
‘Loop Current’
(Yellow) only
at peaks of audio signal
LEDs illuminated:
(Yellow)
(Green)
Power
LED not illuminated
!
SW2 set to ‘OFF’ -
change setting to ‘NORMAL’
.
!
Battery discharged and external AC mains supply off -
turn on external AC mains supply to
charge battery and to operate unit.
!
Battery Fuse Blown -
fit a correctly rated replacement
(NB turn off AC power
and
SW2 first)
Battery Charge
and
Battery Float
LEDs not illuminated
!
External AC mains supply off -
turn on external AC mains supply
!
AC Power Fuse Blown -
fit a correctly rated replacement
(NB turn off AC power
and
SW2 first)
!
Battery missing/not fitted or not connected -
fit battery (of correct type) or reconnect it
Compression
LED not illuminated at any time
!
No inputs connected -
connect an input as described above
!
Relevant ‘Gain’ control not turned up far enough -
adjust control as appropriate
!
Input signal level too low -
check that input signal is >78mV rms for Low-Z speaker inputs, or
10V for 100V line input.
Drive
LED not illuminated
(even at peaks of signal)
!
Loop not connected or open circuit -
See above for correct loop location, and check loop
continuity using a resistance meter. Value should be under 300m
W
.
!
Relevant ‘Gain’ control not turned up far enough -
adjust control as appropriate
5. Turn the Drive control clockwise until the Loop Current LED lights at peaks in
the input signal. Once set, there is no need to adjust the Drive control again.
6. Repeat item 4 for the other input
(if used)
. When adjusting each input, make sure
that audio signal(s) are removed from the other inputs.
This ensures that all signals
are set to equivalent loudness and are operating the compressor correctly.
7. Listen to the audio signal using an induction loop tester or headphone receiver
(such as the ILR3) whilst standing in the area covered by the loop.
!
Check that adequate volume is received (volume control at mid-position on the ILR3).
Adjust the ‘MLC’ control for best sound quality.
-1
If you have an audio analyser and calibrated field probe (e.g. CMR3) available, check for 400mAm max field
strength at 1kHz and ±3dB frequency response.
Loop Design
The loop installed in the lift car needs to be designed and fitted correctly if the
system is to be effective.
Most lifts are built with metal walls and ceilings. Because of the shielding effect of
the metal ‘box’ in such lifts, the loop cable needs to be on the INSIDE of the car.
This is normally achieved by constructing a special loop from metal bars fixed to,
but insulated from, the ceiling. (This can be supplied by Ampetronic).
If the ceiling is not metal, or a suitable hidden location can be found inside a metal
lift car, normal insulated wire of 2.5 mm² or 4 mm² can be used.
The connection from the loop to the equipment should be made using two 2.5 mm²
wires twisted together.
Please consult Ampetronic if you need more advice about the loop design.
No field received in the loop area
!
If ‘Drive’ LED is illuminated at peaks of signal, but no field is received in the loop area, then
the loop is installed in the wrong place or there is a short circuit between the ends of the feed
cable.
Read the ‘Loop design’ section above to confirm loop design.
!
If ‘Drive’ LED is not illuminated, see previous troubleshooting options for a solution.
Power Supply (AC):
Loop Design:
Nominal Supply Voltage:230V 45-65Hz
Depends on application - typically steel
Fuse: T 100mA L
bars on inside of lift, with interconnection
Supply current (Max): 83mA
on top of lift car.
Supply Current (Quiescent): 70mA
Consult Ampetronic for advice.
Loop Output:
Nominal Supply Voltage:115V 45-65Hz
Current: >9.0A peak into 0.1
W
Fuse: T 200mA L
Voltage: >1.5V peak
Supply current (Max): 166mA
Supply Current (Quiescent): 140mA
Loop Resistance: up to 0.1
W
resistive or
0.15
W
max impedance reactive @ 1.6kHz
Live and Neutral connection via vibration
Connection via vibration proof cage clamp
resistant cage clamp terminals.
terminals.
This apparatus must be Earthed.
Frequency Response:
Use the crimp terminal provided.
80Hz - 5.0kHz ± 1.5dB, at low level
measured as loop current with no MLC.
Inputs:
Transformer isolated (1500Vac minimum)
MLC (Metal Loss Correction):
floating input.
0 dB to 4dB / Octave boost.
Connection via vibration proof cage clamp
Fully anticlockwise - flat response.
terminals.
Battery back up (BB / BBL versions):
Line level / Low-Z speaker input:
Internal 12V, 2.1Ah lead acid battery with
appropriate charging circuits.
Input Impedance: 4k
W
Sensitivity: -20dBu (78mV
rms
)
for full output
Battery power sufficient for 12 hours
Overload:>+19dBu (6.8V
rms
)
s0.5 hours full operation.
Battery Fuse: T 1.6A L
100v Line input: (BB / NB versions)
Environmental:
Input Impedance:120k
W
Ambient temperature: -1
Sensi22dBu (10V
rms
) for full output
Overload:>+47dBu (170V
rms
)
Compression (AGC):
Physical:
40dB dynamic range
Compression controlled by adjusting input
level.
Attack and decay time constants optimized
for speech.
Standards:
Meets relevant CE, EMC and safety
standards.
IEC 60118-4 AFILS
Please contact Ampetronic if you need further
assistance.
0°C to + 40°C
IP rating: IP43 when correctly installed.
Refer to installation section for details.
Weight: 3.8kg
Length: 255mm
Width: 190mm
Height: 90mm
TECHNICAL SPECIFICATIONS
