Crest Audio NC-SLM - TECHNICAL Instruction manual

POWER/OUTPUT MODULE
FOR CKS, CKV & CKX SERIES
POWER PROCESSING AMPLIFIERS
Features
• NexSys compatible • Simple setup, tamper-proof configuration
• Signal chassis ground lift jumper • Sequential turn-on/off initiated by NexSys or a hard closure
• Includes NexSys monitoring of load, line-level output audio and AC voltage and current
• Amplifier output terminals on barrier strip with 0.44" (11mm) screw spacing and 0.32" (8mm) lug spacing
• 5mm 6-pin Phoenix connector for sequential turn-on/off (STO) connection
• 5mm 3-pin balanced Phoenix connector for NexSys-initiated line-level output audio return
• With NexSys-initiated STO, user-programmable turn-on and turn-off delay times
NC-SLM
Product Information
The NC-SLM Module fits in the Power/Output bay located on the rear
panel of Crest Audio CKS, CKV & CKX Series Power Processing
amplifiers. It features full NexSys circuitry for Load Monitoring, Line-
Level Output Audio Return and AC Voltage and Current. Load
Monitoring is a powerful feature that permits measurement plots to be
made of the load (speaker) impedance across frequency ranges on each
amp channel. These can be stored and compared to plots run at a later
date to detect changes or problems with the load. Activation of the
Audio Monitor function by NexSys software places the output of the
selected channel on the Audio Return connector. A balanced line is run
between amplifiers and back to the control position where audio is mon-
itored.
Due to potential level differences and the effect of the driver’s frequency
band and tone, only one channel in a system can be placed on the Audio
Return bus at any time.
NC-SLM also provides for NexSys initiation or hard closure activation
of Sequential Turn-On/Off (STO). Being self-powered prior to the
amplifier power-on, the NC-SLM does not require an external DC sup-
ply to activate Sequential Turn-On/Off. The front panel power activation
switch must be in the “Remote” position for the NC-SLM to initiate or
be part of a Turn-On/Off sequence. NC-SLM requires both an NC-IPN
(or any other programmable Input Processor NC Module), and an NC-
NXS Module for operation.
Architects and Engineers Specifications - NC-SLM.
The module shall plug into Crest Audio CKS or CKV Power Processing amplifiers in the
Power/Output bay. The module shall provide NexSys-initiated and hard closure initiated
sequential turn-on/off capability for groups of CKS and/or CKV amplifiers. The module
shall provide turn-on to the host CKS and/or CKV amplifier and a sequential turn-on output
to the next amplifier in the chain. Disconnection of AC power to any number of amplifiers
in the chain shall not affect the turn-on sequence capability of all other amplifiers in the
chain.
The module shall contain the power supplies required for powering the NC-NXS NexSys
Network module (if fitted). The module shall include the hardware required for NexSys
Load Monitoring and AC voltage and current monitoring. A 5mm 6-pin Phoenix connector
shall be provided to receive and pass on the turn-on/turn-off initiation signal. A closure
across two of the Phoenix connector terminals on the first amplifier in the chain shall initiate
the turn-on/turn-off sequence. The module shall provide outputs for both amplifier channels
on barrier strip connectors and a signal ground lift jumper. The module shall be designated
the Crest Audio model NC-SLM.
Load Monitoring, Sequential Turn-On/Off, NexSys®power supply,
AC Voltage & Current Monitor, Audio Return
LISTED 8B42
COMMERCIAL
POWER
AMPLIFIER
120V~60 Hz 15A
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
8
1
9
2
A
3
B
4
C
5
D
6
E
7
F
Model
Name
CKS 100
CKS 200
CKS 400
CKS 800
CKS 800-2
CKS 1200-2
CKS 1600-2
Output Power
@8Ω/Ch.
50W
100W
200W
400W
400W
600W
800W
Model
NC-NXS
Hi
Data
Lo
Crest Audio Inc.
100 Eisenhower Dr.
Paramus, New Jersey 07652 USA
Designed & manufactured in the USA by:
Network
+– +–
Address
Model
Name
CKV 100
CKV 200
CKV 400
CKV 800
CKV 1600
CKV 2400
Output Power
@70.7V
50W
100W
200W
400W
800W
1200W
++
Input A
Input B
–
–
N-Coder
Data
Port
Model
NC-SLM
CLASS 2
WIRING MAY
BE USED
Audio
Return
Out
+
–
Sequential
Turn-On
Output
A
B
+
+
–
–Signal
Ground
Lift
Jumper
Com
On
Off
Com
On
Off
In
Out
Audio Return
+
--
+
--
Sequential
Turn-On/Off
connection to
other
amplifiers
NexSys Bus
On
Off
Com
On
Off
Com
NC-SLM
connections
Power
Processing
Modules
USA-specification amplifier shown

Load Monitoring, Sequential Turn-On/Off, NexSys power supply,
AC Voltage & Current Monitor, Audio Return
Crest Audio Inc.
100 Eisenhower Dr., Paramus NJ 07652 USA
TEL: [phone] FAX: [phone]
http://www.crestaudio.com
Printed in USA
NC-SLM Power/Output Module
BLOCK DIAGRAMS
v. 2.1 4/7/97
Crest Audio reserves the right to make improvements in manufacturing or design which may affect specification. Crest Audio specification literature is available in electronic form to qualified users.
Contact Crest Audio Inc. for more information. NexSys is a registered trademark of Crest Audio Inc. ©1996 Crest Audio Inc.
AUDIO
RETURN
Load Monitor
ckt
FROM
POWER AMP A
V load
I load
Audio Return Enable
CH SEL/GAIN
CH A OUT
CH B OUT FROM
POWER AMP B
AUDIO
RETURN
OUT
NexSys
Module Bus
OSC
OSC Out To
Amp Input
NexSys
Module
SEQUENTIAL
TURN-ON
AC Detect
TO AMPLIFIER
POWER SUPPLY
V line
I line
ON
COM
OFF
ON
COM
OFF
OUT
IN
NexSys Module Bus
MAINS
Opto
NexSys
Digital Supply
I/D
ckt
NexSys On/Off
SPECIFICATIONS
Pass-thru sequence time: 200ms
Connectors: 5mm 6-pin
Phoenix connector
(STO)
5mm 3-pin Phoenix audio return
connector (600Ωsource impedance;
40dB of attenuation driven into 600Ω,
referenced from speaker terminals)
Amplifier output barrier strip*
with 0.44" (11mm) center
and 0.32" (8mm) lug space
Controls: Signal chassis
ground lift jumper
*See CKS / CKV power amplifier operator’s manual for power
output specifications.
*A3300032*
CONTROL OPTIONS
The following NC-SLM parameters
can be controlled/monitored via
hard closure or NexSys software.
Hard closure:
Sequential Turn On/Off activation
NexSys computer control:
Sequential Turn On/Off initiation &
delay times, load monitor, monitor-
ing of audio return, AC mains volt-
age, current and wattage.