IMD 100 Integration manual 4189360015 Rev. G
IMD configuration
Page 82 of 243
There are several thresholds (settings, errors and warnings) which are related to the voltages on
the DC-link and SE voltage. These are depicted in the following figure, and described after the
figure:
0 V
HW DC-link
overvoltage (860 V)
DC-link
voltage
DC-link Vlow (P)
DC-link Vmin (P)
DC-link Vmax (P)
Ballast on
Ballast off
Over-voltage
Normal
operation
Low-voltage
Under-voltage
(P): Configurable
parameter
SE Vlow (p)
SE
voltage
Figure 38 DC-link voltages thresholds
•
DC-link Vmax:
The level at which the IMD will generate an error end perform a safety run. This
parameter also determines the ballast on and off thresholds, which are connected and
disconnected automatically when needed according to the following:
o
Ballast on: DC-link voltage > DC-link Vmax
– (1/32
*
DC-link Vmax)
o
Ballast off: DC-link voltage < V ballast on
– (2/32
*
V ballast on)
The ballast resistor state can be monitored by reading reg. 0xEA (0: resistor OFF, 1: resistor ON).
It can be difficult to monitor the ballast resistor since the ON time of the resistor can be as short as
250
s.
Example ballast ON:
789 −
1
32
∗ 789 = 765
Ballast ON when DC-link voltage is above 765 V DC
DC-link V max: 789 V DC
Example ballast OFF:
765 −
2
32
∗ 765 = 717
Ballast Off when DC-link voltage is below 717 V DC
DC-link V max: 789 V DC