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6 Electronically Controlled Bypass (ECB) Operation
6.1 Electronically Controlled Bypass (ECB)
Operation
6.1.1 Overview
Information provided in this section is intended to enable
the user to connect control wiring, program functions, and
operate the ECB and its optional features.
The ECB contains a local processor located on the ECB
control card, which interacts with the drive’s control logic
for programmable options, remote command input, and
output status reporting. Rather than panel-mounted
operator-activated selector switches, as on the electrome-
chanical option panel, ECB control is provided by the
drive’s processor.
The ECB also contains a power supply which provides back
up for the drive’s logic circuitry, so even if the drive loses
power, the control and communication functions are
maintained.
Figure 6.1 keypad
1. keypad Display
2. Menu keys
3. Menu navigation
4. Control keys
Programming and display are provided by the drive’s local
control panel. (keypad See Figure 6.1)
An important feature of the ECB is the ability to accept
commands from a building automation system (BAS) and
to report operational status in return.
Control wiring connections are made to either the drive’s
control terminals (see Figure 3.20) or terminals provided on
the ECB control card (see Figure 6.2). Drive analog and
digital I/O terminals are multifunctional and need to be
programmed for their intended use while the terminals on
the ECB control card are dedicated for specific functions.
Programming options for drive terminals are seen by
pressing the [Main Menu] key or [Quick Menu] key on the
keypad keypad. Parameter menus appear in the keypad
display. The arrow keys are used for navigating through
the parameter lists. Terminal functions are programmed in
parameter group 5-**. (See Table 6.1 for factory default
parameter settings for drives with an ECB.) Bypass
functions are programmed in parameter group 31-** (see
Table 6.4). See the drive’s supporting materials for detailed
programming instructions.
Electronically Controlled Bypass (ECB) Opera-
tion
BAS-SVX49A-EN 6-1