Alarm And Safety Circuit - Hitachi HBU-2015 Instruction Manual

On 200 V models, the activation voltage is fixed at 380 VDC.
6. When using multiple HBU units, please refer to section III, B on page 16. The first braking unit should have its
jumper set to the MASTER position, and braking units number 2 through N should have their jumpers in the
SLAVE position.
7. Ensure that the case of braking unit is well grounded.
8. All units except the HBU-4220 are completely powered from the DC bus (P and N terminals) of the inverter. The
HBU-4220 also requires single phase AC power to operate. The HBU-4220 also includes terminals marked R and
S, which must be connected to the corresponding terminals on the AC input side of the inverter, as shown below.
REQUIRED
FOR SAFETY
WARNING! Be sure to utilize a power disconnection method as shown in Figure 4
above, which removes power from the inverter should the braking resistor overheat.
Failure to do so may result in risk of fire, injury or death.
WARNING! On 400 V class, be certain to verify the correct jumper position for braking
activation level BEFORE applying power to the system. Otherwise there is risk of
damage to the HBU, the inverter, and/or the resistor(s).
HBU-4220 Only
Figure 4
Typical Alarm and Safety
Circuit
Hitachi America, Ltd.
R
S
Fault relay
energizes when
HBU internal
temperature is
too high
Tarrytown, NY
15