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SHUNT BRAKE RESISTORS/FORCING RESISTORS

SHUNT BRAKE RESISTORS Shunt brakes are designed for one or eight hour duty and rated at 80 volts (1 hr.) or 64 volts (8 hr.). To operate the brake, it is necessary to have a resistor in series with the brake assembly. Coil voltage and value of series resistor, based on a line voltage of 250 VDC is shown in the following table. The TM brake has two identical coils except the TM43 and TM63 which have only one coil.   STANDARD SHUNT COIL INFORMATION

Frame Standard Shunt Coil Style No. Cold Coil Resistance OHMS/Coil Coil Volts/Coil Ohms Resistance Required in Line1 Resistor Part Number Continuous Intermittent Cont Int OHMS Amp OHMS Amp 2 43 2 63 83   E004051 E006026 E008026   73 59.4 31.3   64 64 32   80 80 40   212 171 177   0.88 1.08 1.0   155 125 132   1.1 1.35 1.28   E004044 E006024 E008022   1035 1355 1665   E010049 E013026 E016026   23.8 19.1 8.83   32 32 32   40 40 40   137 111 51.5   1.35 1.68 3.6   101 81 37.7   1.68 2.1 4.53   E010044 E013022 E010622   1985 2311   E019025 E023026   8.51 6.12   32 32   40 40   49.5 35.6   3.8 5.2   36.2 26.1   4.7 6.54   E016022 E023022   3014 E030024 4.5 32 40 26.2 7.12 19.1 8.9 E030022

1 For 250 VDC without discharge resistor. 2 TM 43 and TM63 frames differ from larger TM brakes. Only (1) coil is used.

FORCING SCHEME Often, it is desirable to force magnet coils with a "higher-than rated" voltage to obtain a faster response time. The following table shows typical resistors which can be used to obtain satisfactory results. The customer's control circuit must be designed so that when first energized, the high resistance section is shorted out causing a high voltage to be impressed across the brake. After a short time delay (.8 to 1 second) a relay inserts the high resistance section reducing the holding voltage tately 25 to 30 volts. Forcing and hold voltages are not critical. Both release and setting times are faster with a forcing scheme when compared to a standard shunt circuit.   Holding at a low voltage also allows operation at the full brake torque (1 hr. rating) at a continuous duty cycle (8 hr. rating).

Frame External Resistor Forced Part Number High Resistor Ohms R1-R2 Low Resistor Ohms R2-R3 Coil Volts Coil Amps Inrush Hold Inrush Hold TM 43 TM 63 TM 83 TM 1035 TM 1355 TM 1665 TM 1985 TM 2311 TM 3014 E004045 E006025 E008023 E010045 E013023 E016023 E019022 E023023 E030023 720 585 625 460 380 165 165 120 77 26 22 24 22 13 6.5 6.5 4.7 3.4 185 182 182 173 188 184 182 182 182 22 22 22 23 23 24 23 23 25 2.5 3.0 2.8 3.5 4.7 10 10 14 20 .30 .37 .35 .47 .57 1.3 1.3 1.8 2.7

 

STANDARD SHUNT BRAKE	STANDARD SHUT BRAKE
FORCING SCHEME             NOTE: Normally closed contact is to be customer supplied.	FORCING SCHEME