Johnson Controls VFD67 Series, Getting Started Manual, Page: 34 / 52

34
VFD67 Size A to D Getting Started Guide
www.johnsoncontrols.com Issue Number: 1
OFF :Fixed linear voltage to frequency ratio (constant torque - standard load)
On : Voltage to frequency ratio dependant on load current (dynamic/variable torque/
load). This gives a higher motor efficiency.
0 : Disabled
1 : Detect positive and negative frequencies
2 : Detect positive frequencies only
3 : Detect negative frequencies only
If the drive is to be configured in fixed boost mode (Pr 41 = Fd or SrE) with catch a
spinning motor software enabled, an autotune (see Pr 38 on page 35) must be carried
out to measure the motor’s stator resistance beforehand. If a stator resistance is not
measured, the drive may trip on OV or OI.AC while trying to catch a spinning motor.
dig : Digital input
th : Motor thermistor input, connect as per diagram below
Fr : Frequency input.
Fr.hr :High resolution frequency input.
Figure 6-11
Trip resistance: 3k
Ω
Reset resistance: 1k8
n=0 : At zero speed
At.SP : At speed
Lo.SP : At minimum speed
hEAL : Drive ok
Act : Drive active
ALAr : General drive alarm
I.Lt : Current limit active
At.Ld : At 100% load
USEr : User programmable
No Function Range Defaults Type
32 Dynamic V to f select OFF or On OFF RW
No Function Range Defaults Type
33 Catch a spinning motor select 0 to 3 0 RW
No Function Range Defaults Type
34 Terminal B7 mode select dig, th, Fr, Fr.hr dig RW
0V
Motor thermistor
input
T1
B7
If Pr 34 is set to th so that terminal B7 is used as a motor thermistor, the functionality of
terminal B7 as set-up with Pr 05 , drive configuration, will be disabled.
When setting to th, press mode four times. Analog reference 2 will no longer be selected
as the speed reference. Analog reference 1 should be used.
NOTE
No Function Range Defaults Type
35 Digital output control (terminal B3)
n=0, At.SP, Lo.SP, hEAL,
Act, ALAr, I.Lt, At.Ld, USEr
n=0 RW
This parameter is automatically changed by the setting of Pr 12. When Pr 12
automatically controls the setting of this parameter, this parameter cannot be changed.
NOTE
A change to Pr 35 is set by pressing the MODE key on exit from parameter edit mode.
NOTE
M