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B APPENDIX - INPUT ASSERTION LEVEL

B.1 GENERAL

Digital inputs on VFDs are asserted or activated by either applying a voltage level to the input

(active-high) or by pulling the input down to a common or ground potential (active-low). This

is an important issue when using solid-state outputs (from an external device) to interface

with the VFD, but is less of an issue when using dry contacts. Most VFDs are set up for either

active-high or active-low, but the TCF can be conﬁgured for either type.

The TCF digital inputs (TB-1, 13A, 13B, 13C and 13D) are conﬁgured for active-high as

standard. Refer to section B.2 to determine if the assertion level must be changed, depending

on the type of solid-state circuit being used (PNP/sourcing or NPN/sinking).

NOTE

If dry contacts (from relays, switches, push buttons, etc), or PNP/sourcing

circuits are to be used to activate the digital inputs, the assertion level does

not need to be changed, and this Appendix can be ignored. Also, the label

that covers the control terminal strip can be discarded.

Parameter 79 - INPUT ASSERTION LEVEL shows the assertion level of the inputs, and is

either HIGH (01) or LOW (02). This parameter can also be used to change from active-high

to active-low during initial set-up using the procedure described below in section B.3.

When set for active-high (P79 set to HIGH), TB-4 is conﬁgured as a +12 VDC source and

the digital inputs are activated when they are at +10 VDC or higher (24 VDC max) relative

to TB-4.

When set for active-low (P79 set to LOW), TB-4 is conﬁgured as a 0 VDC common and the

digital inputs (which will be at +12 VDC) are activated when they are at +2 VDC or lower

relative to TB-4.

B.2 SOLID-STATE CIRCUITS

The digital inputs were designed to work with dry contacts (refer to NOTE above), as well as

PNP and NPN type open-collector circuits.

PNP OPEN-COLLECTOR CIRCUITS

If PNP (current-sourcing) outputs are to be

used to activate the drive's digital inputs, the

assertion level does not need to be changed

from the factory default of HIGH.

NPN OPEN-COLLECTOR CIRCUITS

If NPN (current-sinking) outputs are to be

used to activate the drive's digital inputs, the

assertion level must be changed to active-

low. Refer to section B.3 for the procedure to

change P79 to LOW.

TB-4 (+12 VDC)

TCF DIGITAL INPUT (0 VDC)

(ACTIVE-HIGH)

PNP

TB-4 (0 VDC)

TCF DIGITAL INPUT (+12 VDC)

(ACTIVE-LOW)

NPN

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