Bell Control Technical Data 3700

Libertas 3700 series modular relay and high current switching panels provide consistent ringing with accurate pulse timing.

Technical description

From left to right, each panel includes the following modules

• Interface Module
• Power Supply Module
• Output Module(s)
  • DC Striker T4 - four DC striker outputs
  • Combination Output - one DC striker and three motor control dry contact relays
  • Relay Module M4 - four dry contact relays, typically used for motor control

The modules are tied together using a ribbon cable that carries low current power, control voltages and logic signals. Additionally high voltage DC jumpers feed 200VDC from the Power Supply Module to the DC striker output modules.

The interface module features both a galvanically isolated, twisted pair wired interface to the control panel and an optional optical interface.

Installation

Primary power from the local disconnect is connected to the Power Supply Module at L1 and L2. Earth safety is tied to the third terminal with the ground symbol (bonded to the chassis).

Strip input and output wires to 3/8 inch (10mm) for lever action terminals.

AX Systems

The 485 input connector is pinned out 1 for 1 the same as the AX tower connector. When multiple panels are used, parallel the data cable to all panels.

• REMOVE R3 and R4 from bottom of interface if not the end of the 485 line!

Four wires are enough as STATUS is not used at this time (Summer 2023), except for wireless and optical interfaces.

LX Systems

Sufficient power is available from the 12V terminals of the interface for LX terminals P+ and P- (power). Connect the DATA wires to T+ and T- (tower). If the data cable length drops the supply voltage, use a booster power suppply on the 12VDC input of the LX.

Troubleshooting

Lights in normal operation

Interface module

• Active - indicates the high voltage relays are enabled. Indicated from logic before drive transistor.
  • Active only on when outputs are active. Times out 5 seconds after last output.
• Power - 12VDC Power supply from 3710 is on and 5V regulator is OK.
  • Should be as bright as power light on Power module.
• Test Mode - indicates self test is active. Inputs are ignored.
• Signal - blinks with input data.
  • Should never be constantly lit except dim glow in Bit Map mode.
  • Blinks brighter when receiving low Baud signal.
• Input - indicates that input data addressed to this panel, or
  • Steady Blink if configuration switch error.
  • Will not blink if incoming note is for this panel, but no module has been addressed for it.
• Output - indicates that this panel is sending status out to controller.
  • Blinks brighter when set for low Baud.
• Interface 12V - DC-DC isolation converter is working - 12V available on 485 interface
  • Should be as bright as power light on Power module.
• Interface 5V - interface regulator is working (may be damaged by surges induced to data cable)
  • Should be as bright as power light on Power module.

Power module

• Power - 12VDC Power supply is working and AC input within 100-240VAC
• Active - indicates the high voltage relays are enabled. Indicates Interface module drive transistor is OK.

Output modules

• Ready - indicates that interface module has enabled the outputs (not in sleep or reset mode).
• Active - indicates the high voltage relays are enabled. Indicates signal over cable is OK.
• ERR - indicates improper signal received for module (if input not blinking on Interface module).

Error lights

Configuration error

Configuration errors are indicated by blinking Input light on the interface board. If no error lights are lit on output modules then the problem is an invalid setting of the Panel Configuration switch on the interface board. If an error light is lit on an output module, its address switch is incorrectly set for that type of panel.

Correctly configured modules will result in a self test that activates outputs from left to right (in Up sequencing mode).

• Two modules error lights do not come on (other modules do)
  • Modules at the same address must be the same module type - the modules with Err lights off are the problem

Operational error

If error lights occur on output modules, the following operational errors may be indicated:

• All module's error light comes on and stays on.
  • If Bit Map mode is selected, a constant input data stream is needed. Check connections between the panel and controller. The interface module's Signal light sould be indicating presence of the input signal. Perhaps the controller has not been configured for Bit Map mode.
• One module error light comes on. The error resets when the Active state comes on next time.
  • This indicates that the output pulse exceeded the modules maximum pulse time. Reduce the pulse time on the controller (AX or Bit Map modes).

Test buttons

Self test will time out to normal operation in three minutes (from last output test) unless it is left in the repeat or scan modes. Those modes will operate continuously until canceled.

• Quick Tests
  • Long Press Test- enters test mode from normal mode - exits test mode
  • Double Click Test - test reset to output 1 up direction
    • doesn't fire output
    • discards all output timing edits
  • Click Test - cancel repeat/scan modes, reverse direction
  • Click Step - cancel repeat/scan, go to next available output and fire
  • Click Repeat - cancel repeat/scan, fire current output again
• Leave panel in test mode for burn in or bell adjusting (CAUTION! No Time Out)
  • Double Click Step - fire next, continue scan all outputs until cancel w/single click
  • Double Click Repeat - continue to fire current output - repeat until cancel w/single click

Adjust output pulse time

Does not affect motor enable outputs to intelliSwing panels, but will affect Relay modules if used to trigger striker outputs.

Initial pulse times available (milliseconds - Input LED blinks):

75 - one blink - only for very small bells in chimes and carillons for faster repeat

100 - two blinks

150 - three blinks

200 - four blinks - Default

250 - five blinks

300 - six blinks

500 - seven blinks - only for Deagan strikers

600 - eight blinks - only for stubborn Deagan strikers

Click the Step button to get to desired bell output, then long press Step or Repeat until Input LED indicates new pulse width.

• Long Press Step - (up) lengthen output pulse
• Long Press Repeat - (down) shorten pulse
• Click Repeat - re-test using new pulse
• Double click Test - revert to last saved pulse times (losing any recent changes)
• Long Press Test - saves newly selected timing for all bells before exiting self test
  • During save, Input LED blinks four times

If you want to reset to default pulse times

• Change the module configuration (unplug a module temporarily) and cycle power

DC Striker Module

You can use a digital multimeter to check the IGBT output drivers of the DC Striker Module.

Test outputs

• Make sure the panel is powered off (circuit breaker or local disconnect)
• Unplug the power cable from the Power Supply Module that feeds high voltage to the DC Striker Modules
• Remove the output fuses from the module
• Set the multimeter to Diode Junction test mode
• Hold the red meter probe to the top power pin
• Check the top contact of each fuse holder on the module
  • The voltage drop should be around 0.5 Volts - shorted outputs will be near 0 Volts (and fuse will be blown - do not replace)
  • Return the module to Chime Master for replacement/rework if any measurement is less than 0.35 Volts