Warner Electric CBC-750 - Manual (Page 4)

4 Warner Electric • 800-825-9050 819-0494
A switch on the main logic board selects level
control switching on the Channel 2 input or pulse
control input switching on both Channels 1 and 2
inputs.
The following is a brief description of how the
system controls outputs:
1. When an input switches on a given channel,
the previous “on” channel switches off. But
this does not happen instantly. Current in the
channel being de-activated is monitored until
it reaches approximately 10% of its steady
state on value. Then the channel being activat-
ed is switched on. Automatic torque overlap
protection is achieved by monitoring the
decay current in the channel being de-activat-
ed. Current monitoring eliminates the need for
adjustment potentiometers for set-up.
2. Overexcitation current is monitored on the
output channel being switched on.
Overexcitation
current is twice steady state current in the
CBC-750-90 and three times it in the CBC-750-
6
and -24.
3. Once the overexcitation current level is
reached, it is turned off and steady state
holding current is applied to the magnet or
field coil.
This sequence occurs for both channels for either
level of pulse input switching.
Additional input functions are also incorporated into
the control to provide versatility. These include:
• Channel 1 and Channel 2 input inhibit which
inhibits the inputs when activated.
• Output inhibit which de-activates both output
channels on activation.
• A Channel 2 override input which applies full
output current to the Channel 1 load when
activated.
Terminal strip connections for power inputs and
outputs and auxiliary functions are located in the
lower housing of the control. Conduit entrances
are provided in the enclosure. Auxiliary optoisolated
outputs are provided for wiring remote status
monitoring indicators. this allows the user to
monitor control status when the control is remotely
mounted in the machine.
Technical Specifications
Input Power: 120, 220. or 240VAC, ±10%
50/60 Hz single Phase, 350
VA Max.
Output Pulse width modulated full
(Clutch-Brake): wave rectified DC constant
current, switch selectable
ranges
CBC-750-6: Range .900 to
4.340A
CBC-750-24: Range .204 to
1.175A
CBC-750-90: Range .060 to
.310A
Output 12 VDC ±.6 VDC, 250 mA
(Auxiliary): Max.
Ambient 0°f to +113°F (-18°C to
Temperature +45°C) with cover installed
Range: 0°F to +140°F (-18°C to
+60°C) with cover removed
Steady State Via front panel potentiome-
Current Adjust: ters or remote potentio-
meters when operated in
remote mode
Remote Current Via customer supplied
Adjust: potentiometers
5K ohm ±10%, 1/4 watt
minimum
Overexcitation CBC-750-6: 75VDC Nominal
Voltage: CBC-750-24: 240VDC
Nominal
CBC-750-90: 240VDC
Nominal
Circuit Internal short circuit protection
Protection: on each output channel
Fusing: AC input line: 2A Slo-Blo, 250V
OEX Supply:
CBC-790-6: 10A-32V Slo-Blo
CBC-750-24: 5A-250V Slo-Blo
CBC-750-90: 1A-250V Slo-Blo
Auxiliary Opto-isolated NPN transistors,
Indicator 24VDC maximum applied volt-
age, Outputs: 20 mA maximum
current, series connected diode
for reverse polarity protection
Control Opto-isolated, 10VDC @ 10 mA
Inputs: nominal to 30VDC @ 35 mA
nominal sinking or sourcing,
24VAC, 50/60 Hz @ 22 mA
nominal,