Magnetek Elevator Quattro DC - Page 79

Quattro DC User Switches C1 Submenu
77
Figure 19: 2 Thresholds NTSD Mode
3 Thresholds:
The drive uses 3 speed check points to
determine whether or not it should go into
NTSD mode. When any combination of NTSD
Input 1 (C2) or NTSD Input 2 (C2) is logic low,
the drive will compare the speed feedback to
NTSD Threshold 1 (A1), NTSD Threshold 2
(A1), or NTSD Threshold 3 (A1). If the
absolute value of speed feedback is greater
than the selected threshold, the drive will slow
down using S-Curve 4. Then it will clamp the
drive speed command so that the absolute
value of speed command is less than or equal
to NTSD Target Speed (A1). The drive will get
out of NTSD mode and back into normal
operation when: both NTSD inputs are re-
asserted as logic high again and the absolute
value of speed feedback is less than or equal
to the NTSD Target Spd (A1).
NTSD
Input 1
NTSD
Input 2
Result
1 1 Normal Operation
0 1
if
| speed feedback | > NTSD
Threshold 3
decel using S-Curve 4, and
clamp the drive speed
command to
| speed command | ≤ NTSD
Target Speed
1 0
if
| speed feedback | > NTSD
Threshold 2
decel using S-Curve 4, and
clamp the drive speed
command to
| speed command | ≤ NTSD
Target Speed
0 0
if
| speed feedback | > NTSD
Threshold 1
decel using S-Curve 4, and
clamp the drive speed
command to
| speed command | ≤ NTSD
Target Speed
Table 11: 3 Thresholds NTSD Mode
function table
Figure 20: 3 Thresholds NTSD Mode
70fpm
NTSD
Threshold 2
(
A1
)
Decel rate 4 (A2)
Decel jerk in/out 4 (A2)
NTSD Active
(C3)
NTSD Input 1
(C2)
80fpm
NTSD Target
Spd (A1)
Elevator
Speed
Controller
Speed
Command
Example:
NTSD 2 Spd Fdbk (D1) = 80 fpm
NTSD 1 Spd Fdbk (D1) = 23 fpm
NTSD Threshold 2 (A1) = 70 fpm
NTSD Threshold 1 (A1) = 60 fpm
NTSD Target Spd (A1) = 10 fpm
60fpm
NTSD
Threshold 1
(
A1
)
NTSD Input 2
(C2)
23fpm
20fpm
80fpm
NTSD
Threshold 3
(
A1
)
Decel rate 4 (A2)
Decel jerk in/out 4 (A2)
NTSD Active
(C3)
NTSD Input 1
(C2)
80fpm
NTSD Target
Spd (A1)
Elevator
Speed
Controller
Speed
Command
Example:
NTSD 3 Spd Fdbk (D1) = 80 fpm
NTSD 2 Spd Fdbk (D1) = 60 fpm
NTSD 1 Spd Fdbk (D1) = 23 fpm
NTSD Threshold 3 (A1) = 80 fpm
NTSD Threshold 2 (A1) = 60 fpm
NTSD Threshold 1 (A1) = 20 fpm
NTSD Target Spd (A1) = 10 fpm
60fpm
NTSD
Threshold 2
(
A1
)
NTSD Input 2
(C2)
23fpm
NTSD
Threshold 1
(A1)