- Parker Compact Servo Controller User Guide

Start-up manual
COMPAX-M / -S
24
Overvoltage limitation
Energy recuperated during braking is stored in the supply capacitors. The capacity
and storable energy is:
NMD10/NMD20: 1100µ
µµ
µF / 173 Ws
If the energy recuperated from braking causes overvoltage, then ballast
resistances are engaged.
The internal ballast resistance is activated by a bridge between +LS and X5/1.
In the NMD20 delivery status this bridge is fitted.
L1 L2 L3 PE
24V
+-
X5
PE
+LS
-LS
UVWPEBrake
PE+ -
X1
X2
X5
X1
X2
X3
X4X4
1
2
X3
RB
ext
RB
int
Braking power Duration Cooling down time
NMD10
17 kW <50 ms
≥
10s
4.0 kW <1s
≥
50s
Without fan: 120W unlimited
With fan: 250W unlimited
NMD20
9.5 kW <50 ms
≥
10s
2.5 kW <1s
≥
50s
Without fan: 120W unlimited
With fan: 200W unlimited
External ballast resistances can be used with NMD20 (see Page 193).
If the braking power of the internal ballast resistance is insufficient, an external
ballast resistance can be connected.
The external ballast resistance is connected between +LS and X5/2.
To do this, the bridge between +LS and X5/1 must be removed.
The full braking power cannot be used with this bridge present.
L1 L2 L3 PE
24V
+-
X5
PE
+LS
-LS
UVWPEBrake
PE+ -
X1
X2
X5
X1
X2
X3
X4X4
1
2
X3
RB
ext
RB
int
RB
ext
Output X5 is protected from short circuits.
Thermal protection
An emergency stop is triggered at 85°C heat sink temperature, the ready contact is
released and the red LED lights up.
Activation of the
internal ballast
resistance for
NMD20
Maximum braking
power:
Connecting the
external ballast
resistance